Gamma ray absorption of cylindrical fissile material with dual shields

LOW ENERGY ACCELERATOR, RAY TECHNOLOGY AND APPLICATIONS

Gamma ray absorption of cylindrical fissile material with dual shields

WU Chen-Yan，

TIAN Dong-Feng，

CHENG Yi-Ying，

HUANG Yong-Yi，

LU Fu-Quan，

YANG Fu-Jia

Nuclear Science and Techniques

Vol.16, No.5

pp.266-272

Published in print 01 Oct 2005

CLC：TL352,TL375.6

21801

This work analyzed the gamma ray attenuation effect from the self-absorption and shield attenuation perspectively. An exact mathematical equation was given for the geometric factor of the cylindrical fissile material with dual shields. In addition, several approximation approaches suitable for real situation were discussed, especially in the radial and axial directions of the cylinders, since the G-factors have simple forms. Then the space distribution patterns of the G-factor were analyzed based on numerical result and effective ways to solve the geometric information of the cylindrical fissile material, the radii and the heights, were deduced. This method was checked and verified by numerical calculation. Because of the efficiency of the method, it is ideal for application in real situations, such as nuclear safeguards, which demands speed of detection and accuracy of geometric analysis.

Fissile materialIsotopic compositionGamma ray self-absorptionDual shields

References

[1]

Fetter S, Cochran T B, Grodzins L, et al. Science, 1990, 248: 824-834

[2]

Tian Dongfeng, Xie Dong, Huo Yukun, et al. Nucl Instr Meth Phys Res, 2000, A449: 500-504

[3]

Lu Xiangdong,Tian Dongfeng, Xie Dong. Nuclear Techniques (in Chinese), 2004, 27(11): 814-817

[4]

Lu Fuquan, Tian Dongfeng, Wu Shimin, et al. Journal of Fudan University (Natural Science) (in Chinese), 2001, 40(3): 245-248

[5]

Huang Yongyi, Cheng Yiying, Tian Dongfeng, et al. Nuclear Science and Techniques, 2005, 16(1): 17-24

[6]

Fudan University, Tsinghua University, Peking University, Experiments methods of nuclear physics (2nd ed) (in Chinese), Beijing: Atomic Energy Publishing House, 1985

[7]

X-ray mass attenuation coefficients

, <http://physics.nist.gov/PhysRefData/XrayMass-Coef/tab3.html> Accessed Mar. 30th, 2005. Values of the mass attenuation coefficient and the mass energy-absorption coefficient as a function of photon energy, for elemental media

Baidu Scholar

Google Scholar

[8]

X-ray mass attenuation coefficients

, <http://physics.nist.gov/PhysRefData/XrayMass-Coef/tab1.html> Accessed Mar. 30th, 2005. Material constants assumed in the present evaluations for elemental media.

Baidu Scholar

Google Scholar