Polymer gel dosimetry for neutron beam in the Neutron Exposure Accelerator System for Biological Effect Experiments (NASBEE)

8th International Conference on 3D Radiation Dosimetry

Kawamura, H.^1 ; Sato, H.^1 ; Hamano, T.^2 ; Suda, M.^3 ; Yoshii, H.^4

Department of Radiological Sciences, Ibaraki Prefectural University of Health Sciences, 4669-2, Ami, Ami-machi, Inashiki-gun, Ibaraki, Japan^1

Research Center for Charged Particle Therapy, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba, Japan^2

Research, Development and Support Center, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba, Japan^3

Research Center for Radiation Emergency Medicine, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba, Japan^4

关键词: Accelerator system;    Biological effects;    National Institute of Radiological Sciences;    Neutron exposure;    Neutron irradiated;    Polymer gel dosimeter;    Polymer gel dosimetry;    Response curves;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/573/1/012068/pdf
DOI  :  10.1088/1742-6596/573/1/012068

来源: IOP

【 摘 要 】

This study aimed to investigate whether gel dosimetry could be used to measure neutron beams. We irradiated a BANG3-type polymer gel dosimeter using neutron beams in the Neutron exposure Accelerator System for Biological Effect Experiments (NASBEE) at the National Institute of Radiological Sciences (NIRS) in Japan. First, the polymer gels were irradiated from 0 to 7.0 Gy to investigate the dose-R2responses. Irradiated gels were evaluated using 1.5-T magnetic resonance R2images. Second, the polymer gels were irradiated to 1.0, 3.0, and 5.0 Gy to acquire a depth-R2response curve. The dose-R2response curve was linear up to approximately 7 Gy, with a slope of 1.25 Gy-1·s-1. Additionally, compared with the photon- irradiated gels, the neutron-irradiated gels had lower R2values. The acquired depth-R2curves of the central axis from the 3.0- and 5.0-Gy neutron dose-irradiated gels exhibited an initial build-up. Although, a detailed investigation is needed, polymer gel dosimetry is effective for measuring the dose-related R2linearity and depth-R2relationships of neutron beams.