Neutron multiplicity assay device and experiment progress on Pu-U components

Chen Ligao; Gong Jian; Wang Kan; Xie Qilin; Liu Xiaobo; Fan Xiaoqiang; Dong Chuanjiang

doi:10.11884/HPLPB201426.070101

Volume 26 Issue 07

Jun. 2014

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Article Navigation > High Power Laser and Particle Beams > 2014 > 26(07): 070101

Wu Jinghao, Liu Qingxiang, Zhang Zhengquan, et al. Application of dual synchronous coordinate phase-locked loop in AC-link charging power supply[J]. High Power Laser and Particle Beams, 2018, 30: 053006. doi: 10.11884/HPLPB201830.170459

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Chen Ligao, Gong Jian, Wang Kan, et al. Neutron multiplicity assay device and experiment progress on Pu-U components[J]. High Power Laser and Particle Beams, 2014, 26: 070101. doi: 10.11884/HPLPB201426.070101

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Neutron multiplicity assay device and experiment progress on Pu-U components

doi: 10.11884/HPLPB201426.070101

1.
Institute of Nuclear Physics and Chemistry,CAEP,P.O.Box 919-210,Mianyang 621900,China;
2.
Department of Engineering Physics,Tsinghua University,Beijing 100084,China

Received Date: 2014-04-11
Rev Recd Date: 2014-05-28
Publish Date: 2014-06-10

Abstract

Abstract

To verify nuclear components dismantled from a nuclear warhead or stored in a nuclear facility, a neutron multiplicity counter with 32 3He tubes and high density polythene cavity was built. Eight channel circuits were used to process the signals from 3He tubes. Five 252Cf neutron sources were used to calibrate parameters of the counter. To improve the mass assay accuracy, analysis algorithm for weighted point model and double Am-Li neutron sources neutron multiplicity counting were studied. The neutron multiplicity distribution for six weapon-grade plutonium components and seven highly enriched uranium components were measured with the neutron multiplicity counter, assay results show that the mass assay bias is below 1.3% for plutonium components with the weighted neutron multiplicity model, while the value is below 5% for uranium components with calibration curve method.
- arms control and verification,
- neutron multiplicity,
- plutonium component mass,
- uranium component mass,
- experimental measurement

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