کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1884102 1043324 2012 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Optimization of the sensitivity and stability of the PRESAGE™ dosimeter using trihalomethane radical initiators
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم تشعشع
پیش نمایش صفحه اول مقاله
Optimization of the sensitivity and stability of the PRESAGE™ dosimeter using trihalomethane radical initiators
چکیده انگلیسی

The aim of this study is to investigate the effect of trihalomethane radical initiators on the radiological properties, radiation dose sensitivity and post response photo-stability of the PRESAGE dosimeter. Different PRESAGE dosimeters containing 50 and 100 mM of iodoform (CHI3), bromoform (CHBr3) or chloroform (CHCl3) radical initiators where fabricated and irradiated with 6 MV photons for a range of radiation doses from 0 to 30 Gy. A comparison between sensitivity and radiological properties of the PRESAGE dosimeters with the different radical initiators was carried out. Optical density changes of the dosimeters before and after irradiation were measured using a spectrophotometer. The incorporation of different radical initiators in the composition of the PRESAGE dosimeter resulted in variation of the radiation dose sensitivity and radiological properties of the dosimeters depending on the type and concentration of the radical initiator used, with iodoform showing the highest dose-response slope followed by bromoform and chloroform. However, at 100 mM iodoform, the effective atomic number was significantly higher than water (Zeff=16). This enhancement in dose-response was found to be directly related to the carbon–halogen bond dissociation energy and to the radiological properties of each individual radical initiator used in this study. Furthermore, the post-response stability of the PRESAGE dosimeters over two weeks remained stable regardless of the trihalomethane radical initiator employed, with negligible change in the post-response stability and linearity of the PRESAGE dosimeters.


► The influence of I, Br, and Cl based trihalomethane radical initiators on the PRESAGE dosimeter has been investigated.
► Iodoform showed the highest dose-response gradient followed by bromoform and chloroform.
► The enhancement in dose-response was found to be directly related to the carbon–halogen bond dissociation energy.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Radiation Physics and Chemistry - Volume 81, Issue 7, July 2012, Pages 867–873
نویسندگان
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