| CAO Lei,DENG Jun,WANG Cheng-guo,LIU Yun-hong,GUO Wen,QIAN Ye-kan,SUN Quan-fu.Preliminary design of CR39 fast/thermal neutron personal dosimeter used in oil and gas field logging[J].Chinese Journal of Radiological Medicine and Protection,2011,31(4):489-492 |
| Preliminary design of CR39 fast/thermal neutron personal dosimeter used in oil and gas field logging |
| Received:June 07, 2010 |
| DOI：10.3760/cma.j.issn.0254-5098.2011.04.031 |
| KeyWords:Fast/thermal neutron personal dosimeter Externally assigned response BN track pre-adaptor |
| FundProject: |
| Author Name | Affiliation | | CAO Lei | National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China
| | DENG Jun | National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China
| | WANG Cheng-guo | 内蒙古自治区疾病预防控制中心 | | LIU Yun-hong | National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China
| | GUO Wen | National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China
| | QIAN Ye-kan | National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China
| | SUN Quan-fu | National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China
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| 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 neutron, (7.57±0.41)×102 track·cm2·mSv-1, respectively. The detecting linearity range was between 0.013 and 52.8 mSv. According to theoretical derivation and experiment of standard 241Am-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. |
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