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

页码：2339 / 2347

页数：9

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