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http://dx.doi.org/10.7742/jksr.2022.16.1.61

Derivation of Photon Energy Fluence and Mass Energy Absorption Coefficient for 1 Gy Absorbed Dose of Water in Brachytherapy using Ir192 Source  

Kim, Jong-Eon (Department of Radiological Science, Kaya University)
Ahn, Il-Hoon (Department of Gem Design Engineering, Kaya University Graduate School)
Publication Information
Journal of the Korean Society of Radiology / v.16, no.1, 2022 , pp. 61-66 More about this Journal
Abstract
The purpose of this study is to derive photon energy fluence and mass energy absorption coefficient for 1 Gy of absorbed dose of water in brachytherapy using an Ir192 source. From the radiotherapy physics written by Khan, the half-value of lead for the gamma ray beam of the Ir192 source was obtained. The linear attenuation coefficient and the mass attenuation coefficient were calculated from the obtained half-value layer of lead. By matching the calculated lead mass attenuation coefficient with the NIST mass attenuation coefficient data, the photon energy of the matching mass attenuation coefficient was determined as the effective energy. By matching the determined effective energy with the photon energy of the NIST data on the mass energy absorption coefficient of water, the mass energy absorption coefficient of water was obtained as 0.03273 cm2/g(32.73 cm2/kg). The photon energy fluence was calculated as 0.03055 J/cm2 by dividing the obtained mass energy absorption coefficient (32.73 cm2/kg) by the absorbed dose of water 1 Gy.
Keywords
Effective energy; Mass attenuation coefficient; Mass energy absorption coefficient; Absorbed dose;
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Times Cited By KSCI : 2  (Citation Analysis)
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