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KMID : 0357520130360020165
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Journal of Radiological Science and Technology
2013 Volume.36 No. 2 p.165 ~ p.173
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Estimation of the Characteristics for the Dose Distribution in the Polymer Gel by Means of Monte Carlo Simulation
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Park Min-Seok
Kim Gi-Sub
Jung Hai-Jo
Park Se-Young
Choi In-Seok
Kim Hyun-Ji
Yoon Yong-Su
Kim Jung-Min
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Abstract
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This study was the estimation of the dose distribution for proton, prompt gamma rays and proton induced neutron particles, in case of exposing the proton beam to polymer gel dosimeter and water phantom. The polymer gel dosimeter was compositeness material of Gelatin, Methacrylic acid, Hydroquinone, Tetrakis and Distilled water. The density of gel dosimeter was $1.04g/cm^3$ 수식 이미지 which was similar to water. The 72, 116 and 140 MeV proton beams were used in the simulation. Proton beam interacted with the nuclei of the phantom and the nuclei in excited states emitted prompt gamma rays and proton induced neutron particles during the process of de-excitation. The proton particles, prompt gamma rays, proton induced neutron particles were detected by polymer gel dosimeter and water phantom, respectively. The gap of the axis for gel was 2 mm. The Bragg-peak for proton particles in gel dosimeter was similar to water phantom. The dose distribution for proton and prompt gamma rays in gel dosimeter and water phantom was approximately identical in case of 72, 116 and 140 MeV for proton beam. However, in case of proton induced neutron particles for 72, 116 and 140 MeV proton beam, particles were not detected in gel dosimeter, while the Water phantom absorbed neutron particles. Considering the resulting data, gel dosimeter which was developed in the normoxic state attentively detected the dose distribution for proton beam exposure except proton induced neutron particles.
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KEYWORD
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Polymer Gel dosimeter, Proton beam, Prompt gamma rays, Proton induced neutron, Monte Carlo Simulation
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