Design of a controllable Am-Be neutron source: A Geant4 simulation

被引：1
作者：
Hu, Qiang [1 ]
Jia, Wenbao [1 ,2 ]
Hei, Daqian [3 ]
Li, Jiatong [1 ]
Cheng, Can [1 ]
Zhao, Dong [1 ]
机构：
[1] Nanjing Univ Aeronaut & Astronaut, Dept Nucl Sci & Technol, Nanjing 211106, Peoples R China
[2] Collaborat Innovat Ctr Radiat Med Jiangsu Higher, Suzhou 215000, Peoples R China
[3] Lanzhou Univ, Sch Nucl Sci & Technol, Lanzhou 730000, Peoples R China
来源：
APPLIED RADIATION AND ISOTOPES | 2021年 / 174卷
基金：
中国国家自然科学基金;
关键词：
Controllable Am-Be neutron Source; Self-safety; Neutron yield; Geant4; simulation;
D O I：
10.1016/j.apradiso.2021.109775
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
In this work, a controllable Am-Be neutron source with self-safety structure was developed. The basic design of the neutron source is composed of AmO2 layer, air layer and Be layer. The AmO2 layer and Be layer are placed parallelly in a stainless-steel tank. The yield and safety of the designed neutron source can be controlled through changing the vacuum level of air layer between the AmO2 layer and Be layer. Geant4 toolkit was used to optimize the geometrical size of each layer and the optimized thickness of the AmO2 layer, air layer and Be layer were 5 mu m, 3.4 cm and 300 mu m, respectively. When the vacuum level of the air layer was set to 1 kPa, the neutron yield was 5.61 n/10(6)alpha. For an Am-241 alpha activity of 9.313 x 10(9) Bq, the maximum neutron flux emitted from the Be layer was 4.122 x 10(3) n.cm(-2).s(-1).
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页数：4
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