npsm 새물리 New Physics : Sae Mulli

pISSN 0374-4914 eISSN 2289-0041


Research Paper

New Physics: Sae Mulli 2012; 62: 84-88

Published online January 31, 2012

Copyright © New Physics: Sae Mulli.

Dosimetric Characteristics of a Polymer Gel for a 45 MeV Proton Beam

Jihye BONG1,2, Kumbae KIM2, Tae Keun YANG2, Inok KO2, Jiae PARK2, Kyeong Min KIM2, Haijo JUNG2, Younghoon JI2, Soo Il KWON*1

1Department of Medical Physics, Kyonggi University, Suwon 443-760

2Research Institute of Radiological & Medical Science, Korea Institute of Radiological & Medical Sciences, Seoul 139-706



A normoxic polymer gel dosimeter was developed to measure the dosimetric characteristics of a 45 MeV proton beam. The gel dosimeter was synthesized using gelatin, methacrylic acid (MAA), hydroquinon (HQ), tetrakis (THPC) and Distilled water (HPLC) and was poured into an ABS container. The 45 MeV proton beam of the MC-50 cyclotron accelerator was used for testing the gel dosimeter, and using a collimator, we exposed the gel dosimeter at a diameter of 12 mm and a beam current of 2 nA. For the comparison with the gel dosimeter, 50 films of EBT2 were seriated and exposed to 5 nA for 5 sec. The relaxation rate (R2) of the gel dosimeter exposed to the beam was obtained using 3.0T MRI and its dose was analyzed. In the dosimetric range of 0 ~ 15.5 Gy, the correlation coefficient was analyzed. The bragg peak of the proton beam based on the dosimetric changes in the 3.9 ~ 5.3 Gy dosimetric range was found at WED 12.39 mm. The possibility for using the gel dosimeter with films for the dosimetric measurement of a proton beam was confirmed.

Keywords: Polymer gel, Dosimeter, Proton beam, Bragg peak

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