在扫描铅笔质子束辐照下水体模时，对野外束流谱的蒙特卡罗模拟。

MONTE CARLO SIMULATIONS OF OUT-OF-FIELD LET SPECTRA IN WATER PHANTOM IRRADIATED BY SCANNING PENCIL PROTON BEAM.

机构信息

Department of Dosimetry and Application of Ionising Radiation, Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Břehová 7, 110 00 Praha 1, Czech Republic.

General University Hospital in Prague, U Nemocnice 499/2, 128 08 Praha 2, Czech Republic.

出版信息

Radiat Prot Dosimetry. 2022 Aug 22;198(9-11):573-579. doi: 10.1093/rpd/ncac139.

DOI:10.1093/rpd/ncac139

PMID:36005973

Abstract

LET spectra can be measured by track-etched detectors. However, these detectors are not able to identify the type of interacting particles. Monte Carlo simulations can provide this missing information. In this work, Monte Carlo simulations based on the EURADOS Work Group 9 experiment consisting of systematic 3D mapping of out-of-field doses and LET spectra in a prototype water phantom were performed. The simulations aimed to identify the types of particles contributing to the out-of-field LET spectra. The total absorbed dose, LET and energy spectra were calculated. The calculated dose distributions and LET spectra were compared with the ones measured by radiophotoluminiscence and track-etched detectors. The out-of-field particles and their LET values were identified. No statistically significant differences between the measured and simulated spectra were revealed in the LET range of 100-2000 keV μm-1.

摘要

LET 谱可以通过径迹蚀刻探测器进行测量。然而，这些探测器无法识别相互作用粒子的类型。蒙特卡罗模拟可以提供缺失的信息。在这项工作中，基于 EURADOS 工作组 9 实验进行了蒙特卡罗模拟，该实验包括在原型水模体中对场外剂量和 LET 谱进行系统的 3D 映射。模拟旨在确定导致场外 LET 谱的粒子类型。计算了总吸收剂量、LET 和能谱。将计算的剂量分布和 LET 谱与放射光致发光和径迹蚀刻探测器测量的结果进行了比较。确定了场外粒子及其 LET 值。在 100-2000 keV μm-1 的 LET 范围内，测量值和模拟值之间没有显示出统计学上的显著差异。