{"title":"Small-field measurements in 3D polymer gel dosimetry using optical computed tomography.","authors":"Hiraku Kawamura, Yoshitomo Araki, Yuichi Sato, Masumi Uehara","doi":"10.1093/rpd/ncaf066","DOIUrl":null,"url":null,"abstract":"<p><p>Polymer gel dosimetry enables three-dimensional measurements. We measured the dose-response characteristics using an optical computed tomography (CT) system and evaluated the scatter correction for polymer gel-optical CT to calculate accurate field output factors. The dose-response can be expressed using an appropriate fitting model in the range of 0-10 Gy. The irradiated four-finger gel phantom with four collimators of different diameters was scanned using optical CT. The corrected optical CT image showed an improved low-intensity signal near the edge closer to the film, resulting in the profile. The field output factors in the 5 mm diameter small irradiation field were calculated using a gel dosemeter-optical CT system and compared with those from several ionization chambers. The polymer gel-optical CT system is suitable for calculating field output factors in small-field measurements.</p>","PeriodicalId":20795,"journal":{"name":"Radiation protection dosimetry","volume":" ","pages":""},"PeriodicalIF":0.8000,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Radiation protection dosimetry","FirstCategoryId":"93","ListUrlMain":"https://doi.org/10.1093/rpd/ncaf066","RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"ENVIRONMENTAL SCIENCES","Score":null,"Total":0}
引用次数: 0
Abstract
Polymer gel dosimetry enables three-dimensional measurements. We measured the dose-response characteristics using an optical computed tomography (CT) system and evaluated the scatter correction for polymer gel-optical CT to calculate accurate field output factors. The dose-response can be expressed using an appropriate fitting model in the range of 0-10 Gy. The irradiated four-finger gel phantom with four collimators of different diameters was scanned using optical CT. The corrected optical CT image showed an improved low-intensity signal near the edge closer to the film, resulting in the profile. The field output factors in the 5 mm diameter small irradiation field were calculated using a gel dosemeter-optical CT system and compared with those from several ionization chambers. The polymer gel-optical CT system is suitable for calculating field output factors in small-field measurements.
期刊介绍：
Radiation Protection Dosimetry covers all aspects of personal and environmental dosimetry and monitoring, for both ionising and non-ionising radiations. This includes biological aspects, physical concepts, biophysical dosimetry, external and internal personal dosimetry and monitoring, environmental and workplace monitoring, accident dosimetry, and dosimetry related to the protection of patients. Particular emphasis is placed on papers covering the fundamentals of dosimetry; units, radiation quantities and conversion factors. Papers covering archaeological dating are included only if the fundamental measurement method or technique, such as thermoluminescence, has direct application to personal dosimetry measurements. Papers covering the dosimetric aspects of radon or other naturally occurring radioactive materials and low level radiation are included. Animal experiments and ecological sample measurements are not included unless there is a significant relevant content reason.
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