纯丙烷气体在中子场微剂量学中的适用性研究：一项蒙特卡罗研究

INVESTIGATION OF APPLICABILITY OF PURE PROPANE GAS FOR MICRODOSIMETRY AT NEUTRON FIELDS: A MONTE CARLO STUDY.

作者信息

Chattaraj Arghya, Selvam T Palani, Datta D

机构信息

Radiological Physics and Advisory Division, Health, Safety and Environment Group, Bhabha Atomic Research Centre, Mumbai, Maharashtra, India.

出版信息

Radiat Prot Dosimetry. 2019 Nov 30;185(1):74-86. doi: 10.1093/rpd/ncy261.

DOI:10.1093/rpd/ncy261

PMID:30576567

Abstract

Applicability of pure propane gas for microdosimetric measurements in neutron fields was investigated using the FLUKA Monte Carlo code. Monoenergetic neutrons in the energy range 1 keV-20 MeV and the ISO-neutron sources such as 241Am-Be, 241Am-B, 252Cf and 252Cf + D2O were considered in the present study. The tissue-equivalent proportional counter (TEPC) simulated in the study was LET-1/2 (by Far West Technology) with site sizes 1, 2 and 8 μm. The study demonstrates that for a given site size, the TEPC filled with tissue-equivalent propane and pure propane gases produce similar microdosimetric distributions when the density of pure propane gas is lowered appropriately. For the ISO-neutron sources, the density of propane gas requires scaling by a factor 0.85. For the monoenergetic neutrons, depending upon the neutron energy, the values of scaling factors are in the range of 0.58-0.93.

摘要

使用FLUKA蒙特卡罗代码研究了纯丙烷气体在中子场中进行微剂量测量的适用性。本研究考虑了能量范围为1 keV - 20 MeV的单能中子以及诸如²⁴¹Am - Be、²⁴¹Am - B、²⁵²Cf和²⁵²Cf + D₂O等国际标准化组织（ISO）中子源。研究中模拟的组织等效正比计数器（TEPC）是由Far West Technology公司生产的LET - 1/2型，其探测点尺寸为1、2和8微米。研究表明，对于给定的探测点尺寸，当适当降低纯丙烷气体的密度时，填充有组织等效丙烷和纯丙烷气体的TEPC会产生相似的微剂量分布。对于ISO中子源，丙烷气体的密度需要按0.85的比例进行缩放。对于单能中子，根据中子能量的不同，缩放因子的值在0.58 - 0.93的范围内。