1 Pang Jufeng . Gamma energy spectrum data analysis. Xi'an : Science and Technology Press of Shanxi Province , 1990
2 Zhu Guoqin . Journal of Jianghan Petroleum Institute, 1993; 15(1): 108
3 Fudan University, Qinghua University, Beijing University . Atomic nuclear physics experimental method. Beijing : Atomic Energy Press , 1985