期刊
PHYSICA MEDICA-EUROPEAN JOURNAL OF MEDICAL PHYSICS
卷 84, 期 -, 页码 41-49出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ejmp.2021.03.002
关键词
Gel dosimetry; Fricke; PAGAT; Radiation chemical yields; Monte Carlo simulations
资金
- CONICET Argentina [PIP 11220130100658CO]
- Universidad de la Frontera -Chile [DI18-0106]
This study compared the response differences of two types of gel dosimeters at 44 kV and 6 MV, finding variations in sensitivity. The calculated radiation chemical yields were in agreement with experimental results, indicating that differences in dosimeter response may be related to linear energy transfer of each photon beam.
Purpose: Dosimetry of ionizing radiation quantifies the energy deposited by an incident beam to the medium. This study presents the relative response of two types of gel dosimeters describing their differences by estimating radiation chemical yields produced in water radiolysis. Methods: Two types of gel dosimeter were used, namely an acid ferrous ion solution infused with xylenol orange known as Fricke gel and a polymer gel based on acrylamide and N,N'-methylenebis(acrylamide) known as PAGAT. Samples were irradiated using two photon beam energies, one from a conventional X-ray tube operated at 44 kV and the other one from a LINAC operated at 6 MV. The dosimeters were analyzed by optical absorbance and magnetic resonance imaging. Additionally, the linear energy transfer of each beam was calculated using Monte Carlo simulations for further estimation of the radiation chemical yields produced during water radiolysis. Results: Obtained results for both gel dosimeters indicate that their response at 44 kV and 6 MV are different, regardless of the read-out technique. On average, the sensitivity at 44 kV was found to be 65 % of the response at 6 MV. The calculated radiation chemical yields are in agreement with the observed experimental results. Conclusions: The main reason for the difference in the response of the dosimeters may be related to the linear energy transfer of each photon beam, which varies the production of primary chemical species during water radiolysis.
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