Radiation Protection Dosimetry[JOURNAL]
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200 papers
Characterization of optically stimulated luminescence dosimetry using NaCl pellets in breast x-ray imaging.
Bjerkén A, Karampiperi M, Tomic H … +5 more , Dustler M, Rääf C, Tingberg A, Bernhardsson C, Bakic PR
Radiat Prot Dosimetry · 2025 Aug · PMID 40875265 · Full text
In this study, NaCl pellets read with optically stimulated luminescence were evaluated for their potential use as a point dosemeter in breast x-ray imaging. Dosimetry with NaCl pellets has previously been applied to vari...
In this study, NaCl pellets read with optically stimulated luminescence were evaluated for their potential use as a point dosemeter in breast x-ray imaging. Dosimetry with NaCl pellets has previously been applied to various environmental and medical settings. NaCl pellets have potential in clinical breast dosimetry because they can enable multiple point measurements to be simultaneously conducted in a cost- and time-efficient manner. Using two digital mammography imaging systems, the air kerma response of the NaCl pellets for a standard breast setup was investigated. The air kerma response was observed to be linear, and mathematical fits were successfully used to estimate the cumulative incident air kerma during digital breast tomosynthesis. Deviations from a reference digital dosemeter were 6% and 8% for the two mammography systems, respectively. Measurements conducted at different angles of exposure showed that the NaCl pellets had no angular dependency in the range ± 15°. Finally, the uniformity of the beams was confirmed to avoid possible errors due to the uncertainty of the dosemeters' positions in the exposure field.
Early apoptotic response in kidney after 177Lu-octreotate administration with or without potential radioprotector α1-microglobulin.
Ytterbrink C, Simonsson K, Shubbar E … +3 more , Gram M, Helou K, Forssell-Aronsson E
Radiat Prot Dosimetry · 2025 Aug · PMID 40875262 · Full text
The antioxidant α1-microglobulin (A1M) has been suggested as kidney protector during 177Lu-octreotate treatment. The aim of this work was to evaluate apoptotic-related transcript expression in kidney cortex and medulla f...
The antioxidant α1-microglobulin (A1M) has been suggested as kidney protector during 177Lu-octreotate treatment. The aim of this work was to evaluate apoptotic-related transcript expression in kidney cortex and medulla following injection of 177Lu-octreotate and/or A1M. Mice were injected with 177Lu-octreotate, A1M, or 177Lu-octreotate + A1M. Control groups received PBS or vehicle solution. Animals were killed after 24 hours or 7 d. mRNA was isolated from kidney medulla and cortex. Expression of 84 apoptosis-related genes was assessed by q-PCR. Gene expression profiles in kidney cortex were generally similar in the 177Lu-octreotate and 177Lu-octreotate + A1M groups. This was also seen in kidney medulla at 24 hours, but at 7 d anti-apoptotic response of A1M was observed. Altogether, 177Lu-octreotate exposure induced pro-apoptotic response (e.g. Apaf1, Bax, and Tnfrsf10b genes) in kidney medulla and cortex. A1M co-administration did not inhibit pro-apoptotic response in kidney cortex, while A1M initiated pro-survival mechanisms in kidney medulla.
Some historical incidents with nuclear submarines along the Norwegian coast.
Fagerjord SA
Radiat Prot Dosimetry · 2025 Aug · PMID 40875267 · Publisher ↗
There has been an increase in the activities of naval nuclear-powered vessels in the High North and vessels carrying radioactive waste along the Norwegian coastline. Previously, there have been incidents with such vessel...
There has been an increase in the activities of naval nuclear-powered vessels in the High North and vessels carrying radioactive waste along the Norwegian coastline. Previously, there have been incidents with such vessels in the sea area near Norway, which also require emergency handling from the Norwegian authorities. This article gives some examples of historical events that have been particularly interesting. The incidents include reactor or cooling system failures, fires and the actions of crews.
Early proteomic response in thyroid gland after 131I administration in female Balb/c mice.
Rudqvist N, Spetz J, Schüler E … +5 more , Parris TZ, Langen B, Wallem CS, Helou K, Forssell-Aronsson E
Radiat Prot Dosimetry · 2025 Aug · PMID 40875264 · Full text
131I (iodide) accumulates in the thyroid and may affect thyroid tissue. Mechanisms behind such effects are not known. The aim was to investigate early changes in protein expression in thyroid and plasma from mice injecte...
131I (iodide) accumulates in the thyroid and may affect thyroid tissue. Mechanisms behind such effects are not known. The aim was to investigate early changes in protein expression in thyroid and plasma from mice injected with 131I as iodide. Female Balb/c nude mice were i.v. injected with 0 or 490 kBq 131I and killed after 24 h. Thyroid and blood samples were collected from each animal. Protein levels were determined by mass spectrometry. Data are available via ProteomeXchange with identifier PXD062861. Altogether, 17 and 20 proteins showed statistically significant altered levels in thyroid gland and plasma, respectively, after 131I exposure. Most of these proteins had decreased and increased levels in thyroid and plasma, respectively. Few of them were previously proposed radiation responsive proteins. Functional annotation suggests impact on haematopoiesis, reduced oxygen levels, and hypothyroidism. The role of CHIA and PGAM2 in radiation-induced response should be further examined, together with identification and validation of biomarkers of 131I exposure.
Age- and sex-specific cancer risk predictions for some important radionuclides in a Swedish population-use of the updated ORNL computation method for chronic exposure.
Andersson M, Leggett RW, Eckerman K … +1 more , Mattsson S
Radiat Prot Dosimetry · 2025 Aug · PMID 40875263 · Full text
Radiation dosimetry and cancer risk estimations are central to virtually all radiation safety applications, optimization, and research. These estimates relate to various exposure situations including planned, existing, a...
Radiation dosimetry and cancer risk estimations are central to virtually all radiation safety applications, optimization, and research. These estimates relate to various exposure situations including planned, existing, and emergency situations. The International Commission on Radiological Protection (ICRP) has developed a new methodology to handle the dosimetry of an acute/single intake of radionuclides. To expand this to a chronic exposure over a lifetime or during shorter periods, Oak Ridge National Laboratory (ORNL) applies a methodology based on the ICRP primary data with additional lifetime population-based radiogenic cancer risk estimations involving age- and gender-specific intake rates and organ specific cancer risk models. The releases of unwanted artificial radionuclides in the environment could have a big impact on society, both locally and globally. Such an exposure may occur over an extended time period, and the derived cancer risk coefficients should reflect that possibility. In the present study, cancer risk coefficients are calculated for the Swedish population for 14C, 137Cs, 90Sr, 131I, and 60Co, for internal exposure through air, food, and water and external exposure from air, water, surface, and soil.
Recommended guidelines for choosing and optimizing surgical C-arms in pediatric surgery to minimize radiation exposure.
Feghali JA, Maisonobe JA, Habib Geryes B
Radiat Prot Dosimetry · 2025 Oct · PMID 40874708 · Publisher ↗
INTRODUCTION: Surgical C-arms are essential tools in pediatric surgery in various specialties. The selection of an appropriate C-arm for pediatric use is critical, as manufacturers offer different balances between radiat...
INTRODUCTION: Surgical C-arms are essential tools in pediatric surgery in various specialties. The selection of an appropriate C-arm for pediatric use is critical, as manufacturers offer different balances between radiation dose and image quality. OBJECTIVE: This study introduces a practical measurement protocol that enables straightforward comparison of C-arms using readily available tools in most facilities. METHODS: A measurement protocol for evaluating radiation dose and image quality across different C-arm models for pediatric use is suggested. To illustrate this methodology, seven C-arm models from three manufacturers were assessed using a polymethyl methacrylate phantom to simulate pediatric patients. Dose and image quality were measured across various configurations, including fluoroscopy and low-dose modes, while considering features like additional copper filtration, anti-scatter grid removal, and field zoom. RESULTS: Dose and image quality measurements on C-arms illustrate the methodology's application and the impact of fluoroscopy parameters and pediatric-specific features on dose and image quality. Recommendations are provided to guide the selection and optimization of C-arms for pediatric surgery, ensuring the best compromise between dose reduction and diagnostic image quality. CONCLUSION: This study introduces a practical method for evaluating C-arms in pediatric settings, helping to improve equipment selection and optimize imaging protocols for safer pediatric imaging practices.
Comparing dose response of cancer incidence in Sweden after the Chernobyl Nuclear Power Plant accident with Life Span Study of atomic bomb survivors.
Tondel M, Nordquist T, Isaksson M … +2 more , Rääf C, Wålinder R
Radiat Prot Dosimetry · 2025 Oct · PMID 40838680 · Full text
Follow-up of the atomic bomb survivors in Japan in the Life Span Study (LSS) has been fundamental for the understanding of the dose-response curve. We compare our risk estimates from a newly published epidemiological stu...
Follow-up of the atomic bomb survivors in Japan in the Life Span Study (LSS) has been fundamental for the understanding of the dose-response curve. We compare our risk estimates from a newly published epidemiological study on cancer in Sweden after the Chernobyl Nuclear Power Plant accident with the LSS data. Hazard ratios (HRs) with 95% confidence intervals (95% CIs) were calculated using conditional logistic regression adjusted for rural/nonrural habitat, education level, and pre-Chernobyl cancer incidence from 1980 to 1985, respectively. Adjusted HRs by sex were calculated in deciles for all cancer sites combined for 1986 to 2020. These risk estimates were translated to excess relative risk (ERR) to allow comparison with LSS incidence data. ERRs per decile were compatible with ERR in the low-dose range <100 mGy for both sexes. The CIs in each decile need to be taken into account when interpreting the dose-response curve. Risk estimates in dose categories add important information at very low doses on the dose-response curve when compared to LSS data.
Evaluating the relationship between noise reduction and object thickness in scatter correction processing.
Tsuchiya H, Takaki T, Ota S … +2 more , Fujita Y, Murakami S
Radiat Prot Dosimetry · 2025 Oct · PMID 40828517 · Publisher ↗
Physical grids (PGs) are used in portable bedside radiography to reduce scattered X-rays that reach the detector. Because the use of PGs degrades image quality due to oblique incidence of X-rays or deviation of the cente...
Physical grids (PGs) are used in portable bedside radiography to reduce scattered X-rays that reach the detector. Because the use of PGs degrades image quality due to oblique incidence of X-rays or deviation of the center line on the grid, scatter correction (SC) processing is often used instead of PGs. This study aimed to evaluate the relationship between object thickness and noise reduction in SC processing. Polymethyl methacrylate (PMMA) phantoms of different thicknesses (16, 20, 26, and 30 cm) were used as objects. The Burger phantom was placed at the center of the thickness direction of the PMMA phantoms. Images were acquired with PGs, without PGs, and with SC processing which consists of contrast improvement processing and noise reduction processing. Contrast and noise were evaluated. Contrast of images without PG improved when SC processing was used. However, the effect of noise reduction process decreased with increase in the thickness of PMMA, and significant decrease was observed when the thickness of PMMA was ≥26 cm. In SC processing, the effect of noise reduction decreased with the increase in object thickness. These findings suggest that the applicability of SC processing may be limited, particularly in large patients.
Assessment of spatial-average absorbed power density and peak temperature rise in skin model under localized eletromagnetic exposure.
Zheng J, Zhang Y, Diao Y … +1 more , Shi D
Radiat Prot Dosimetry · 2025 Oct · PMID 40817877 · Publisher ↗
Numerical dosimetry for assessments of the absorbed power density (APD) and temperature rise has been conducted using multi-layer skin models, incorporating skin, fat, muscle, and other components, providing a scientific...
Numerical dosimetry for assessments of the absorbed power density (APD) and temperature rise has been conducted using multi-layer skin models, incorporating skin, fat, muscle, and other components, providing a scientific foundation for setting exposure limits. However, the influence of the vasculature on dosimetry outcomes remains underexplored. In this study, we developed a synthetic blood vessel model and integrated it into multi-layer skin models. Electromagnetic computations were performed, followed by steady-state temperature rise evaluations using the Pennes bioheat transfer equation across a frequency range of 3 to 30 GHz. To quantify the effect of vascular modeling on dosimetry results, simulations incorporating vasculature with varying endpoint diameters were compared to those without vasculature. Results showed that the effect of vascular modeling on peak spatial-averaged APD was negligible, and its influence on peak temperature rise was ~8% at 3 GHz, decreasing to less than <3% above 6 GHz. And the effect of the endpoint diameter is marginal. These variations are smaller than those previously reported due to changes in tissue thickness and dielectric or thermal properties. While the effect on peak temperature rise is modest, including vasculature helps refine localized thermal distributions and may inform future improvements in anatomical modeling.
Study on the 241Am-Be neutron reference radiation field established at CAEP.
Zhang S, Ding DJ, Mao BJ … +5 more , Zhuo RH, Cheng J, Zheng H, Lv JL, Liu YX
Radiat Prot Dosimetry · 2025 Sep · PMID 40814204 · Publisher ↗
In order to evaluate the field characteristics and instrument calibration capability of the 241Am-Be neutron reference radiation field at China Academy of Engineering Physics (CAEP), this paper conducted a series of rese...
In order to evaluate the field characteristics and instrument calibration capability of the 241Am-Be neutron reference radiation field at China Academy of Engineering Physics (CAEP), this paper conducted a series of researches on the radiation field. Firstly, the neutron energy spectrum of the field was investigated by multi-sphere spectrometer and Geant4. Secondly, the quantity transmission from China Institute of Atomic Energy (CIAE) to CAEP was achieved through the precision long counter system. In addition, three neutron dose rate meters from different manufacturers were calibrated in both the fields at CAEP and CIAE. Finally, the uncertainty of calibration factor for each instrument was calculated and validated in the two fields. The results demonstrated that the room scatter in the neutron radiation reference field at CAEP meet the requirement of ISO 8529 and the neutron energy spectrum measured in the field was acceptable. The range of neutron ambient dose equivalent rate that can be produced at CAEP and its uncertainty were determined. The calibration factors and their extended uncertainties obtained using two instruments in both fields were found to be reasonable and reliable. The radiation field established at CAEP can meet the routine calibration and experiment of common neutron dose rate meters.
Radiation dose to the eye lens and the shielding efficacy of a protective eye mask in patients with Hodgkin lymphoma undergoing repeated CT examinations.
Rhee DB, Yeo JS, Kim HG … +2 more , Bae IH, Kim HJ
Radiat Prot Dosimetry · 2025 Oct · PMID 40795321 · Publisher ↗
This study evaluated radiation dose to the eye lens and the shielding efficacy of a radiation-protective eye mask (E-Mask) during repeated chest and abdomen computed tomography (CT) scans. Dose measurements were obtained...
This study evaluated radiation dose to the eye lens and the shielding efficacy of a radiation-protective eye mask (E-Mask) during repeated chest and abdomen computed tomography (CT) scans. Dose measurements were obtained using an anthropomorphic phantom and an optically stimulated luminescence dosemeter (Model TOPAZ, LANDAUER, USA). A 5-y follow-up scenario for Hodgkin lymphoma was simulated by assuming one scan per quarter, with the single-scan dose multiplied by 20 to represent four scans annually over 5-y. Despite the use of low-dose protocols based on national diagnostic reference levels issued by the Korea Disease Control and Prevention Agency, unshielded cumulative lens doses reached 363.89 mSv (right) and 424.84 mSv (left). Using an E-Mask reduced these doses to 243.96 mSv and 240.13 mSv, corresponding to reductions of 32.96% and 43.48%, respectively. These findings support the use of the E-Mask in radiosensitive populations to reduce lens exposure during long-term CT follow-up.
Optimizing z-axis coverage in computed tomography scans of the kidney, ureters, and bladder via standard operating procedures: a clinical audit report.
Blom RM, Cockmartin L, Marshall N … +1 more , Bosmans H
Radiat Prot Dosimetry · 2025 Sep · PMID 40794892 · Publisher ↗
Internal audit at our radiology department identified variability in doses for computed tomography scans of the kidney, ureters, and bladder (CT KUB). This prompted a revision of the standard operating procedure (SOP) us...
Internal audit at our radiology department identified variability in doses for computed tomography scans of the kidney, ureters, and bladder (CT KUB). This prompted a revision of the standard operating procedure (SOP) using less ambiguous osseous anatomical landmarks, namely the T10 vertebra endplate and inferior margin of the pubic symphysis. The objective of this study was to evaluate the use and effectiveness of SOPs as a means of scan length optimization and dose reduction. In total 247 CT-KUB scans were retrospectively analyzed in terms of compliance with the new osseous anatomical landmarks, and in terms of total scan length and dose-length product (DLP). The intervention comprised of two phases: (1) implementation of a new SOP with less ambiguous osseous anatomical landmarks, (2) amendment of the SOP, to assist identification of T10 endplate, by means of a sagittal scout view.This phased approach to SOP adjustments produced significant reduction in over-scanning. Excess over-scanning was reduced in the first phase, with a reduction of 14% in scan length and 32% in DLP. In the second phase, scan length was further reduced by 7%. Overall, scan length decreased by 20% and DLP by 55%.
Indoor radon concentration and public dose evaluation in Ningxia Hui Autonomous Region, China.
Dong L, Bai L, Wu Y … +5 more , Song Y, Sun Y, Ji X, Wang M, Li H
Radiat Prot Dosimetry · 2025 Sep · PMID 40758054 · Publisher ↗
The indoor radon concentration in a total of 143 rooms from 82 urban and 61 rural households in Ningxia was measured using the solid nuclear track method over four quarters for 1 y, followed by calculation of the annual...
The indoor radon concentration in a total of 143 rooms from 82 urban and 61 rural households in Ningxia was measured using the solid nuclear track method over four quarters for 1 y, followed by calculation of the annual effective dose. The results indicated that the mean of indoor radon concentrations was 88 Bq m-3, with a range from 39 to 226 Bq m-3. The concentrations exceeded 100 Bq/m-3 in 30% of the measurement locations, with two points measuring above 200 Bq/m-3, accounting for 1.4%. The indoor radon concentration was higher in rural areas compared to urban areas. Moreover, it exhibited a seasonal variation, with the highest levels observed during winter and the lowest during summer. Additionally, the effective dose of indoor radon among residents in Ningxia was calculated at 2.20 mSv a-1.
Evaluation of sampling and analytical uncertainties and estimation of natural radioactivity levels in the soil samples in Kalpakkam, Tamilnadu.
Arun B, S V, M M … +2 more , Parthasarathy K, Venkatraman B
Radiat Prot Dosimetry · 2025 Sep · PMID 40715034 · Publisher ↗
The high-purity germanium (HPGe) detector is used to quantify natural radioactivity concentrations in soil samples. The total uncertainty due to the contribution of the analytical method and sampling uncertainty is evalu...
The high-purity germanium (HPGe) detector is used to quantify natural radioactivity concentrations in soil samples. The total uncertainty due to the contribution of the analytical method and sampling uncertainty is evaluated in this study. The relative sampling uncertainty values for 40K, 238U, and 232Th are found to be within 5%. The measured specific activity levels ranged between 225.6 ± 8.5 Bq/kg and 479.6 ± 13.0 Bq/kg for 40K, 12.1.6 ± 1.4 Bq/kg and 73.2 ± 2.7 Bq/kg for 238U, and 48.7 ± 2.6 Bq/kg and 548.7 ± 17.0 Bq/kg for 232Th, respectively. The radiological hazard parameters, such as absorbed dose rates and annual effective dose values, were estimated from the 40K, 238U, and 232Th activity concentration values. The absorbed dose rate values ranged between 45 nGy/h and 383 nGy/h with a mean value of 142 nGy/h. The annual effective dose values ranged from 0.06 mSv/y to 0.47 mSv/y with a mean value of 0.17 mSv/y.
Development of a prediction model for ambient dose equivalent rate distribution based on ecological half-life profiles using LASSO regression and KURAMA data.
Shikaze Y, Saito K, Tanimura N … +3 more , Yoshimura K, Xudong L, Machida M
Radiat Prot Dosimetry · 2025 Sep · PMID 40704971 · Publisher ↗
The two-component model, comprising a fast-decay and a slow-decay component, has been widely used to approximate the decreasing trends of air dose rates in contaminated areas surrounding major nuclear accident sites. How...
The two-component model, comprising a fast-decay and a slow-decay component, has been widely used to approximate the decreasing trends of air dose rates in contaminated areas surrounding major nuclear accident sites. However, its adequacy is yet to be thoroughly validated. This study analyzed extensive car-borne survey data collected from 2011 to 2016 after the Fukushima Daiichi Nuclear Power Plant accident using the least absolute shrinkage and selection operator regression with a high-degree-of-freedom model. This analysis aimed to evaluate the adequacy of the two-component model and investigate the profiles of ecological half-lives. The results demonstrate that the two-component model can approximate the decreasing trend of air dose rates in the Fukushima area well in most cases. However, in ~20% of the cases, the one-component model provided a better fit. The fast-decay component in the two-component model exhibited a sharp ecological half-life peak below 1 y, with a frequency distribution peaking at 0.3-0.4 y. In contrast, the slow-decay component displayed a broader half-life peak in approximately half of the cases, with a frequency distribution spanning several years to over 50 y. The reduction speed of air dose rates was fastest in urban areas, followed by paddy fields, croplands, deciduous forests, and evergreen forests. The reduction speed decreased as the initial air dose rate increased, a trend explained by the weight assigned to the fast-decay component rather than the value of its ecological half-life. Future predictions of air dose rate distributions were made using a prediction model formula that incorporated the average ecological half-life profiles calculated for each land-use and initial air dose rate category. Prediction accuracy was verified through comparison with integrated map data, which merge air dose rate datasets obtained using different monitoring methods and represent the most currently reliable source. The predicted values tended to decay faster overall than the integrated map data, with an average deviation within 10% over the six-year period. This discrepancy arises because the car-borne survey data were collected on paved roads, where air dose rates decrease rapidly due to the quick washout of radiocesium. The differences between the prediction model values and integrated map values were larger for forests than for farmlands (paddy fields and croplands) and urban areas. This suggests that the reduction in air dose rates is slower in pure forests, where the car-borne surveys were rarely conducted.
Comprehensive investigation of radiation protection in veterinary hospitals in Changzhou, China.
Wang Q, Fu Q, Yang S
Radiat Prot Dosimetry · 2025 Aug · PMID 40693894 · Publisher ↗
To assess the current status of radiation protection in Changzhou veterinary hospitals. Questionnaires were used to survey the veterinary hospitals and their radiation workers, questions included veterinary hospitals' ba...
To assess the current status of radiation protection in Changzhou veterinary hospitals. Questionnaires were used to survey the veterinary hospitals and their radiation workers, questions included veterinary hospitals' basic information, location, type of X-ray diagnostic equipment, and personal information, status survey, the radiation cognition of the radiation workers. In search of veritable data for the estimation of occupational doses, an AT1123 radiation survey dosemeter was used to simulate the measurement of the ambient dose equivalents around the head and neck of a radiation worker operating in the imaging room. RaySafe RF was used to measure the air kerma at the center of the irradiation field and 0.5 cm from it. RaySafe RF and related phantoms were used for performance tests of X-ray diagnostic equipment. A total of 118 veterinary hospitals, 118 radiation workers, and 119 X-ray diagnostic equipment were surveyed. Among the 119 X-ray diagnostic equipment, 118 were DR (Digital Radiography) for veterinary practice, and 1 was a general-purpose CT scanner. The 118DRs cover 31 brands (manufacturers), the top six brands of DRs accounted for 68% of the total. A portion of the veterinary hospitals did not fully consider radiological protection in site selection (most veterinary hospitals were located near shops or residential areas), imaging room location (only 53 X-ray diagnostic devices are set on the first floor), and imaging room shielding. One hundred and seventeen (98.3%) X-ray diagnostic equipment needs to be operated while the radiation workers stay in the imaging room. Individual monitoring of occupational external exposure was carried out in 117 (99.2%) veterinary hospitals, and 59 (50.0%) did not carry out health surveillance for radiation workers. Twenty three (19.5%) veterinary hospitals placed Thermoluminescent Dosimeter (TLDs) in the imaging room or even next to the X-ray tube. The vast majority of radiation workers manually restrained pets (93.2%) and the majority (84.7%) of radiation workers refused to wear lead gloves during restraints, resulting in occasional exposure of their hands to the primary beam. The performance tests of X-ray diagnostic equipment of six DRs found that DRs of four (66.6%) brands had unqualified indexes, and the main unqualified indexes were the linearity of tube output of two DRs (33.3%) and alignment of X-ray field of three DRs (50.0%). The air kerma in the irradiation field of DRs ranged from 122.3 to 410.4 uGy, and there were obvious differences between the air kerma in the irradiation field and out of it (Z = -5.125， P <.001). The ambient dose equivalents around the head and neck of animal restrainers ranged from 22 to 182 nSv. The site selection of the veterinary hospitals, and the placement of the imaging room are not optimized because of the lack of occupational hazard assessment, the routine performance tests of X-ray diagnostic equipment are not carried out, and the occupational health examination and personal dose monitoring of radiation workers are not up to the standard. Animal restraint by workers are relatively common and dosemeters are occasionally inappropriately placed. Relevant competent departments should introduce radiological protection standards for veterinary hospitals promptly.
Radiation doses for pediatric cardiac computed tomography angiography: weight-based radiation typical values at a tertiary hospital in southern Thailand.
Yangdon T, Kritsaneepaiboon S, Poosiri S
Radiat Prot Dosimetry · 2025 Aug · PMID 40676846 · Publisher ↗
This study determined weight-based median radiation dose levels or typical values as defined by the International Commission on Radiological Protection of pediatric cardiac computed tomography angiography (CTA) in a tert...
This study determined weight-based median radiation dose levels or typical values as defined by the International Commission on Radiological Protection of pediatric cardiac computed tomography angiography (CTA) in a tertiary hospital. A total of 211 cardiac CTA studies from 194 children (<15 years old) were retrospectively analyzed. The study examinations were organized into categorized base on body weight ranges. The typical values for CTDIvol(mGy) and DLP(mGy.cm) were respectively determined for each weight band as follows: <5 kg(n = 42): 1.02,12.16; 5 ≤ 15 kg(n = 57): 1.42, 25.0; 15 ≤ 30 kg(n = 53): 2.15, 40.94; 30 ≤ 50 kg(n = 26): 3.80, 100.04; and 50 ≤ 80 kg(n = 3): 8.06, 212.23. The overall median (interquartile range) for each CT dose parameter were as follows: E = 1.80 (1.16-2.83) mSv, SSDEDw = 3.23 (2.54-4.78) mGy, SSDEAP = 3.17 (2.51-4.68) mGy, SSDELAT = 3.18 (2.54-4.50) mGy, SSDEAP + LAT = 3.25 (2.60-4.57) mGy, and SSDEEff = 3.21 (2.57-4.55) mGy. Further research is needed to develop local, regional, and national weight-based lifetime attributable risks for cardiac CTA in children.
Optimizing radiation dose and image quality in neonatal mobile radiography.
Maeda T, Hara M, Yamasaki H … +2 more , Nakahara M, Tanabe Y
Radiat Prot Dosimetry · 2025 Aug · PMID 40676843 · Full text
Children are more susceptible to radiation exposure than adults. Therefore, determining an appropriate radiation dose requires balancing and minimizing radiation exposure while maintaining image quality (IQ) for accurate...
Children are more susceptible to radiation exposure than adults. Therefore, determining an appropriate radiation dose requires balancing and minimizing radiation exposure while maintaining image quality (IQ) for accurate diagnosis. We evaluated the optimal radiation dose parameters for neonatal chest and abdominal mobile radiography by assessing entrance surface dose and IQ indices. A range of exposure parameters was tested on neonatal and acrylic phantoms, and the optimal settings were determined through visual and physical evaluations. Overall, 65 kVp and 1.2 mAs provided the best balance between minimizing radiation exposure and maintaining high IQ for neonates. This study offers essential insights into optimizing radiographic conditions for neonatal care, contributing to safe and effective radiological practices. These optimized parameters can help guide future clinical applications by ensuring reduced radiation risk and enhanced diagnostic accuracy.
Analysis of occupational radiation doses in nuclear medicine and radiography students during clinical training.
Rouvalis G, Deb P, Badawy MK
Radiat Prot Dosimetry · 2025 Aug · PMID 40676842 · Publisher ↗
An analysis compared the occupational radiation doses received by Nuclear Medicine Technologist (NMT) and radiography students during their clinical training at an Australian University from 2017 to 2020. Utilising Optic...
An analysis compared the occupational radiation doses received by Nuclear Medicine Technologist (NMT) and radiography students during their clinical training at an Australian University from 2017 to 2020. Utilising Optically Stimulated Luminescence dosemeters to measure the personal dose equivalent, the retrospective cohort included students with dose readings above 100 μSv per monitoring period. Of the total number of students monitored, ~68% received doses below the minimum reportable threshold of 100 μSv per monitoring period, suggesting that most students had minimal exposure during their placements. A chi-square test revealed a significant difference between NMT and radiography students in the proportion of doses below this threshold (Hp(10): χ2(1, N = 1367) = 168.24, P < .001; Hp(0.07): χ2(1, N = 1367) = 139.27, P < .001). Analysing doses above this threshold revealed that NMT students had significantly higher median radiation doses than radiography students, with median Hp(10) doses of 161 μSv versus 130 μSv, respectively (P < .001). Year-to-year analysis indicated that NMT student doses remained stable over the study period, while radiography student doses varied significantly. Comparison with hospital staff doses showed that NMT students received significantly lower doses than professional NMTs (P < .001), whereas radiography students received higher doses than professional radiographers (P < .001). After limiting hospital staff doses to include those only above 100 μSv in a reporting period, radiography students still received higher doses than professional radiographers. The elevated exposure among NMT students compared to radiography students however, emphasizes the need for enhanced radiation protection strategies in nuclear medicine education, emphasising specialized training and regular dose assessments to ensure student safety without compromising educational quality.
Comparison of knowledge and concerns about radiation between the general population and radiological technologists using a fact-finding survey.
Ohshima K, Nakao K, Morooka R … +6 more , Takeda S, Fukamizu Y, Ueshima N, Murata S, Kaneko J, Arai T
Radiat Prot Dosimetry · 2025 Jul · PMID 40663597 · Publisher ↗
We conducted an online survey of 1953 members of the general population (valid response rate: 65.1%) and 384 radiological technologists (valid response rate: 100%) to examine the relationship between radiation knowledge...
We conducted an online survey of 1953 members of the general population (valid response rate: 65.1%) and 384 radiological technologists (valid response rate: 100%) to examine the relationship between radiation knowledge and concerns. The mean knowledge score (maximum: 50) was 28.7 in the general population and 40.2 among radiological technologists. The mean concern scores (maximum: 50) were 25.0 and 17.1, respectively. Both scores differed significantly between the groups (Mann-Whitney U test, P < .01). In the general population, the relationship between knowledge and concern scores varied according to age. In those aged < 30 years, the correlation was weak (R, -0.411 to -0.412), whereas in those aged ≥ 30 years, it was stronger (R, -0.541 to -0.546), suggesting that knowledge reduces concerns. No significant age-based differences were observed among the technologists. These findings suggest that increasing knowledge about radiation may help alleviate concerns.
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