Radiation protection dosimetry最新文献

{"title":"Radiation dose and image quality in pediatric bitewing imaging.","authors":"Raheis Rajalingam, Karen Brage, Louise Kjærby Nielsen, Freja Bøgh Eriksen, Helene Hviid Jørgensen, Anne Sofie Mikkelsen, Gitte Schøler, Nejc Mekiš, Maja Bruvo, Helle Precht","doi":"10.1093/rpd/ncae227","DOIUrl":"10.1093/rpd/ncae227","url":null,"abstract":"<p><strong>Introduction: </strong>Bitewing examinations are used to examine the pediatric dental status. The aim of this study was to compare the image quality and radiation dose between two different X-ray systems used for pediatric bitewing imaging.</p><p><strong>Materials and methods: </strong>Data were obtained from both pediatric in vivo bitewing studies and phantom studies. Two X-ray systems were used: Trophy CCX digital (TCCX) (Trophy Irix 70, Marne-la-Vallee, France) and Planmeca Pro X (PPX) (Planmeca, Helsinki, Finland). An Unfors dosimeter (Unfors EDD-30, Billdal, Sweden) was used to measure the skin dose. Image quality was evaluated blindly by three experienced dentists using a Likert scale of 1-5 based on the visual representation of the anatomical structures with emphasis on caries.</p><p><strong>Results: </strong>The highest scoring in vivo bitewing images were obtained with TCCX, but the skin dose was 36% higher (mean 3029 ± 613 μGy) and 113% higher (mean 1364 ± 276 μGy) with standard settings than with compared to PPX. The evaluation of image quality revealed a higher median value for all ratings of TCCX compared to PPX for both the patient and phantom studies, meaning that the images of TCCX were rated as higher quality than the images from PPX. No correlation was found between the median score and the skin dose or between the median score and the exposure times.</p><p><strong>Conclusion: </strong>A significant difference in radiation dose and image quality was found between TCCX and PPX in bitewing imaging. TCCX generally produced higher doses and better graded images, although all images were suitable for diagnosis.</p>","PeriodicalId":20795,"journal":{"name":"Radiation protection dosimetry","volume":" ","pages":"113-121"},"PeriodicalIF":0.8,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142828697","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparison of calibration results for α, β surface contamination monitors.","authors":"Liviu-Cristian Mihailescu, Denis Glavič-Cindro, Jussi Huikari, Andrej Javorník, Stanislav V Stanev","doi":"10.1093/rpd/ncae223","DOIUrl":"10.1093/rpd/ncae223","url":null,"abstract":"<p><p>Surface contamination monitors are used intensively in many facilities, like in the nuclear medicine departments for clearance measurements and decontamination and in decommissioning of nuclear installations. For a reliable use, all surface contamination monitors should have a valid calibration with traceability to the international standards. A comparison exercise for calibrations in terms of efficiency in 2π steradian for surface contamination monitors was organized between five dosimetry calibration laboratories, members of EURAMET (The European Association of National Metrology Institutes). Four β-beta radionuclide sources, Sr-90, Cl-36, Cs-137, Co-60, and one α-alpha source, Am-241, were used for calibrations during this exercise. Two transfer surface contamination monitors, one Canberra SABG 100 and one Berthold LB 124 with 100 cm2 and 343 cm2 effective area, respectively, were used. The monitors were circulated between the partners and were periodically returned to the pilot laboratory for stability checks. The efficiencies in 2π steradian measured by the participants do not fully agree for all sources and both detectors despite the fact that all laboratories used similar types of surface contamination sources and had proper traceability to primary standards for surface emission rate measurements. As no evident difference in measurements of surface emission rates is expected between the primary standard laboratories that calibrated the sources, it is very probable that the observed differences are mainly due to the calibration procedures used by each laboratory and that the measurement uncertainties of efficiency in 2π steradian are underestimated. This report presents the results of this pilot comparison for calibration of surface contamination monitors and stresses the need to organize similar generalized exercises. This report also identifies some gaps in procedures for calibration of surface contamination monitors.</p>","PeriodicalId":20795,"journal":{"name":"Radiation protection dosimetry","volume":" ","pages":"79-87"},"PeriodicalIF":0.8,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142829783","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analyses of radioactivity concentrations in soil and assessment of effective doses in several districts of Banten and West Java, Indonesia.","authors":"Makhsun, Dadong Iskandar, Wahyudi, Eka Djatnika Nugraha","doi":"10.1093/rpd/ncae226","DOIUrl":"10.1093/rpd/ncae226","url":null,"abstract":"<p><p>Radioactivity concentration in soil was analyzed around the capital city of Indonesia, Jakarta along with the adjoining provinces of West Java and Banten, representing one of the most densely populated in Indonesia. Nestled within this area is a nuclear research reactor. The analysis of natural and artificial radioactivity concentrations using a HPGe gamma spectrometry to measure 226Ra, 232Th, 40K, and 137Cs in surface soil samples. The results indicate that the average activity concentrations of 226Ra, 232Th, and 40K ranged from 18 to 49, 24 to 74, and 18 to 249 Bq/kg, respectively. The calculated value for the total average absorbed dose rate in the air in Banten and West Java is 38 ± 4 and 34 ± 4 nGy/h. Nonetheless, the calculated value of the external hazard index indicates that the soils in that region are deemed suitable for use in construction materials, and the area is safe for habitation. The activity concentrations of 137Cs in several districts of Banten and West Java ranged from <0.09 to 0.73 Bq/kg. Even a minor introduction of artificial radioactivity into the environment constitutes a form of pollution that must be closely monitored as a potential environmental threat.</p>","PeriodicalId":20795,"journal":{"name":"Radiation protection dosimetry","volume":" ","pages":"130-136"},"PeriodicalIF":0.8,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142922740","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Correction to: Radiocarbon in aquatic biota samples in a brackish lake adjacent to a reprocessing plant in Rokkasho, Japan, from 2006 to 2022.","authors":"","doi":"10.1093/rpd/ncae230","DOIUrl":"10.1093/rpd/ncae230","url":null,"abstract":"","PeriodicalId":20795,"journal":{"name":"Radiation protection dosimetry","volume":" ","pages":"157"},"PeriodicalIF":0.8,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142855226","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of gamma dose rate on the public from soil samples collected from industrial areas of Tamil Nadu.","authors":"Seenuvasan Karthikayini, Ananthanarayanan Chandrasekaran, Vilvanathan Sathish, Mohamed Saiyad Musthafa","doi":"10.1093/rpd/ncaf001","DOIUrl":"10.1093/rpd/ncaf001","url":null,"abstract":"<p><p>The present work is the first and foremost radiological study of soil samples collected from industrial estates in Tamil Nadu. The magnetic susceptibility measurement revealed that 74.19% of the samples have medium %χFD, which denotes a commixture of coarser grains or the SP grains with a size of <0.005 μm. The range of measured activities of 210Po and 210Pb were 3 ± 0.3-38 ± 2.6 Bq kg-1 and 16 ± 1.5-48 ± 2.9 Bq kg-1. The mean activity concentrations of 238U (33 Bq kg-1) and 40K (467 Bq kg-1) marginally exceeded the Indian recommended values of 28.67 and 400 Bq kg-1, respectively, whereas 232Th (47 Bq kg-1) did not exceed 63.83 Bq kg-1. The 238U and 232Th are the significant contributors to the production of radiogenic heat in the study area. Pearson correlation analysis confirmed the prime role of 232Th in radiation hazards and the insignificant relation between magnetic minerals and natural radioactivity.</p>","PeriodicalId":20795,"journal":{"name":"Radiation protection dosimetry","volume":" ","pages":"137-149"},"PeriodicalIF":0.8,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143010628","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of extremely low-frequency (50 Hz) electromagnetic fields on vital organs of adult Wistar rats and viability of mouse fibroblast cells.","authors":"Chandra Kant Singh Tekam, Shreyasi Majumdar, Pooja Kumari, Santosh Kumar Prajapati, Ajay Kumar Sahi, Richa Singh, Sairam Krishnamurthy, Sanjeev Kumar Mahto","doi":"10.1093/rpd/ncae220","DOIUrl":"10.1093/rpd/ncae220","url":null,"abstract":"<p><p>In recent years, scientific communities have been concerned about the potential health effects of periodic electromagnetic field exposure (≤1 h/d). The objective of our study is to determine the impact of extremely low-frequency pulsed electromagnetic fields (ELF-PEMF) (1-3 mT, 50 Hz) on mouse fibroblast (red fluorescent protein (RFP)-L929) cells and adult Wistar rats to gain a comprehensive understanding of biological effects. We observed that RFP-L929 exhibits no significant changes in cell proliferation and morphology but mild elevation in aspartate aminotransferases, alanine aminotransferases, total bilirubin, serum creatinine, and creatine kinase-myocardial band levels in ELF-PEMF exposed groups under in vitro and in vivo conditions. However, the histological examination showed no significant alterations in tissue structure and morphologies. Our result suggests that 50-Hz ELF-PEMF exposure (1-3 mT, 50 Hz) with duration (<1 h/d) can trigger mild changes in biochemical parameters, but it is insufficient to induce any pathological alterations.</p>","PeriodicalId":20795,"journal":{"name":"Radiation protection dosimetry","volume":" ","pages":"88-104"},"PeriodicalIF":0.8,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142829784","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Assessment of external occupational exposure of radiation workers in Jiangsu Province, 2019-2022.","authors":"Wei Chen, Xindi Wei, Yuji Miao, Yuanyuan Zhou, Xiangyong Fan, Jin Wang","doi":"10.1093/rpd/ncae219","DOIUrl":"10.1093/rpd/ncae219","url":null,"abstract":"<p><p>This article analyzes the external occupational radiation exposure distribution and trends among radiation workers in Jiangsu Province. The results show that the total annual collective effective dose for radiation workers in Jiangsu Province from 2019 to 2022 was 24.82 person·Sv, with an average annual effective dose of 0.34 mSv over the 4-y period. The average annual effective dose exhibited an initial increase followed by a subsequent decrease, with statistically significant differences (P < .001) between different years. In the medical uses, nuclear medicine and interventional radiology had higher average annual effective doses compared to other categories, at 0.42 and 0.38 mSv, respectively (P < .05). In industrial applications, accelerator operation and industrial testing workers had higher average annual effective doses compared to others, at 0.32 and 0.31 mSv, respectively (P < .001). Among different levels of medical institutions, secondary hospitals had the highest average annual effective dose (0.38 mSv, P < .001). Overall, the average annual effective dose for radiation workers in Jiangsu Province remained relatively low from 2019 to 2022, meeting national standards. However, special attention should still be given to radiation workers in nuclear medicine, interventional radiology, industrial testing, and accelerator operation.</p>","PeriodicalId":20795,"journal":{"name":"Radiation protection dosimetry","volume":" ","pages":"56-62"},"PeriodicalIF":0.8,"publicationDate":"2024-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142829781","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Radiation dose assessment during dental cone beam computed tomography procedures in Sri Lanka towards establishing a dose reference level.","authors":"Madumali Nissanka, Duminda Satharasinghe, Jeyasingam Jeyasugiththan, Wikum Bandara, Wasundara Wijayasinghe, Indika Weerapperuma, Nadeena Jayasuriya, Ruwan Jayasinghe","doi":"10.1093/rpd/ncae215","DOIUrl":"10.1093/rpd/ncae215","url":null,"abstract":"<p><p>This study assesses radiation doses in cone beam computed tomography (CBCT) procedures in Sri Lanka, with the goal of establishing initial diagnostic reference levels (DRLs). Data from 1162 retrospective scans across four institutions were analyzed, and the medians of the pooled dose distribution for seven clinical indication categories were presented as the DRL values. The proposed DRLs based on clinical indications are 1013 mGy·cm2 for pathological conditions including cysts, tumors, and lesions, 1307 mGy·cm2 for implant planning, 1266 mGy·cm2 for presurgery assessment, and 1585 mGy·cm2 for evaluation of sinus and nasal pathology, temporomandibular disorder, and facial trauma. Considerable variability in doses across facilities was observed, driven by differences in equipment and imaging practices. Therefore, this study recommends adopting suggested DRL values as benchmarks, standardizing protocols to reduce dose variability, and implementing a national framework for regular updates of DRL values.</p>","PeriodicalId":20795,"journal":{"name":"Radiation protection dosimetry","volume":" ","pages":"1-9"},"PeriodicalIF":0.8,"publicationDate":"2024-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142625040","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Development of equivalent dose assessment methodology for the lens of the eye at nuclear power plant workers.","authors":"Siyoung Kim, Jungkwon Son, Cheon-Woo Kim","doi":"10.1093/rpd/ncae216","DOIUrl":"10.1093/rpd/ncae216","url":null,"abstract":"<p><p>As the International Commission on Radiological Protection lowers the equivalent dose limit for lens of the eye of radiation workers, the importance of radiation protection for the lens of the eye has been increased. In the case of poor working condition, such as high temperatures and humid environments at nuclear power plants, wearing an eye dosemeter near the worker's eye may interfere with work. In addition, it would not be reasonable for all workers to wear an eye dosemeter to evaluate the lens equivalent dose even in areas with an expected low exposure dose in the NPPs. Therefore, it is necessary to develop an indirect assessment method for lens equivalent dose. The purpose of this study is to develop an indirect assessment method for a lens equivalent dose using correlation factors between whole-body dose and eye. The correlation factors are calculated by MCNP simulation results.</p>","PeriodicalId":20795,"journal":{"name":"Radiation protection dosimetry","volume":" ","pages":"10-17"},"PeriodicalIF":0.8,"publicationDate":"2024-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142669057","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study on the dynamics of radon concentration buildup in the closed-loop measurement system with RAD7 online radon monitor.","authors":"Chitra Natarajan, Chandrasekaran Seethapathy, Venkata Srinivas Challa, Venkatraman Balasubramaniam","doi":"10.1093/rpd/ncae225","DOIUrl":"10.1093/rpd/ncae225","url":null,"abstract":"<p><p>Radon and thoron exhalation rates from samples are estimated by the standard closed-loop technique using online radon monitors. Conventionally, the mass balance equation is formulated by considering the closed air volume of the sample chamber and the detector chamber put together. This model serves the purpose of estimating the radon/thoron exhalation rates for the prescribed pump flow rate of 1 L min-1 using RAD7 online monitor. The flow rate requirement is crucial for thoron measurement due to its short half-life. In the present work, an alternate model is proposed which simulates the dynamics of radon/thoron concentration dictated by the air entry and exit rate and brings out the effect of pump flow rate. This model is more of academic interest, where sample chamber and detector chamber are considered as two separate entities since they are separated by tubing. The mass balance equation is reformulated considering the air entry and exit in and out the individual chambers. The radon buildup in the sample chamber and detector chamber were treated separately by two coupled differential equations. The equations were numerically solved. The model reiterated the fact that the lower flow rates do not affect the buildup profile of relatively long-lived 222Rn (half-life 3.8 d) and its steady-state concentration attained in the closed air volume. However, experiments carried out for flow rates 0.3 and 0.5 L min-1 with RAD7 monitor using powdered granite sample with higher 226Ra and 232Th concentrations gave contradicting results. The radon effective removal rate was found to decrease with increase in flow rate from 0.3 to 1 L min-1. This issue was investigated, and it was speculated that the thoron interference problem might not be properly addressed for flow rates <1 L min-1. This was ascertained by observing the effective radon removal rate in the absence of thoron by conducting radon decay experiments with different flow rates. For the case of short-lived thoron (half-life 55 s), the model described the dynamics of thoron concentration in the closed loop and the steady-state concentrations attained in the detector and sample chamber. As expected, the model showed that due to decay losses during transit of thoron between the chambers, the steady-state concentrations attained in the chambers considerably differ from each other even for 1 L min-1 flow rate.</p>","PeriodicalId":20795,"journal":{"name":"Radiation protection dosimetry","volume":" ","pages":"18-30"},"PeriodicalIF":0.8,"publicationDate":"2024-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142740294","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}