Preliminary design of CR39 fast/thermal neutron personal dosimeter used in oil and gas field logging
10.3760/cma.j.issn.0254-5098.2011.04.031
- VernacularTitle:用于油气田测井的CR39快/热中子个人剂量计的初步设计
- Author:
Lei CAO
;
Jun DENG
;
Chengguo WANG
;
Yunhong LIU
;
Wen GUO
;
Yekan QIAN
;
Quanfu SUN
- Publication Type:Journal Article
- Keywords:
Fast/thermal neutron personal dosimeter;
Externally assigned response;
BN track pre-adaptor
- From:
Chinese Journal of Radiological Medicine and Protection
2011;31(4):489-492
- CountryChina
- Language:Chinese
-
Abstract:
Objective To increase externally-assigned response, improve energy response of CR39 and develop positive fast/thermal neutron personal dosimeter applicable for occupational exposure in oil and gas field logging by using pre-recoil layer.Methods The externally-assigned response of CR39 detector was improved through increasing the track density by using the α particle induced by the reaction of 10B(n,α) 7Li with the BN as pre-recoil layer, and the increase was vilified by using both Monte-Carlo simulation and experiment exposed by standard neutron source.Results Fast/thermal neutron personal dosimeter's neutron flux sensitivity and neutron dose equivalent sensitivity were 3.46 × 10-4 track per 0.013 and 52.8 mSv.According to theoretical derivation and experiment of standard 241 Am-Be neutron source, detecting efficiency and energy response of CR39 were effectively improved, and quantitative measurement of dose contributed by thermal neutron was realized.Conclusions CR39 fast/thermal neutron personal dosimeter of high sensitivity is applicable to oil and gas field logging environment and of potential development.
