Neutron moderator structure improvement of a PGNAA online analysis system based on DT neutron generator

被引：2
作者：
Cai, Pingkun [1 ]
Hei, Daqian [2 ,3 ]
Jia, Wenbao [1 ,3 ]
Li, Jiatong [2 ]
Cheng, Can [4 ]
Sun, Aiyun [1 ]
Zhao, Dong [1 ]
Wang, Liangzi [5 ]
Wang, Xingbo [5 ]
机构：
[1] Nanjing Univ Aeronaut & Astronaut, Dept Nucl Sci & Technol, Nanjing 211106, Peoples R China
[2] Lanzhou Univ, Sch Nucl Sci & Technol, Lanzhou 730000, Peoples R China
[3] Jiangsu Higher Educ Inst, Collaborat Innovat Ctr Radiat Med, Suzhou 215000, Peoples R China
[4] Jiangsu Inst Metrol, Nanjing 210023, Peoples R China
[5] Nucl Power Inst China, Chengdu 610213, Peoples R China
来源：
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY | 2023年 / 332卷 / 06期
基金：
国家重点研发计划; 中国国家自然科学基金;
关键词：
PGNAA online analyzer; MCNP; DT neutron generator; Neutron moderator; Neutron flux; Detection sensitivity; OPTIMIZATION; BULK; COAL; DESIGN; SAMPLE; SETUP;
D O I：
10.1007/s10967-023-08900-w
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
The neutron moderator structure of a prompt gamma-ray neutron activation analysis (PGNAA) system based on a deuterium-tritium (DT) neutron generator was re-optimized. In this study, a 1 cm lead combined with a 2 cm high-density polyethylene (HDPE) was set as a new moderator. The thermal neutron flux, fast neutron flux of more than 6 MeV and total neutron flux in the samples increased by 22%, 41% and 41%, respectively. The signal-to-interference ratio (SIR) increased from 15 to 19%. The measurement results with samples containing different element contents indicated that the detection sensitivity of the analyzer with the new moderator structure was significantly improved.
引用
收藏
页码：2339 / 2347
页数：9
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