郭之虞
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论文成果
Neutronic Design of PKUNIFTY. Nuclear Instruments and Methods in Physics Research A651 (2011) 67–72.
发布时间：2024-09-14点击次数：
影响因子：
1.4
DOI码：
10.1016/j.nima.2010.12.194
发表刊物：
Nuclear Instruments and Methods in Physics Research A
关键字：
D–Be neutron source
Neutron radiography
Neutronic design
Monte–Carlo simulation
摘要：
The Peking University Neutron Imaging Facility (PKUNIFTY) is a Radio Frequency Quadruple (RFQ) accelerator based system. The fast neutrons are produced by 2 MeV deuterons bombarding beryllium target. The moderator, reflector, shielding and collimator have been optimized with Monte–Carlo simulation to improve the neutron beam quality. The neutrons are thermalized in water cylinder of Φ26×26 cm2 with a polyethylene disk in front of Be target. The size of deuteron beam spot is optimized considering both the thermal neutron distribution and the demand of target cooling. The shielding is a combination of 8 cm thick lead and 42 cm thick boron doped polyethylene. The thermal neutrons are extracted through a rectangular inner collimator and a divergent outer collimator. The thermal neutron beam axis is perpendicular to the D+ beam line in order to reduce the fast neutron and the γ ray components in the imaging beam. When the neutron yield is 3×1012 n/s and the L/D is 50, the thermal neutron flux is 5×105 n/cm2/s at the imaging plane, the Cd ratio is 1.63 and the n/γ ratio is 1.6×1010 n/cm2/Sv.
论文类型：
期刊论文
文献类型：
J
卷号：
651
期号：
1
页面范围：
67-72
是否译文：
否
发表时间：
2011-09-21
收录刊物：
SCI