[1] Briesmeister J F[J]. MCNP-a General Monte Carlo Code for n-particle Transport Code US LA-12625-M(1997).

[2] Gardner R P, Verghese K[J]. Nucl. Geophys., 5, 4(1991).

[3] Ullo J J[J]. Nucl. Sci. Eng., 92, 228(1986).

[4] Shyu C M, Gardner R P, Verghese K[J]. Nucl. Geophys., 7, 241(1993).

[5] Verghese K, Gardner R P, Mickael M, et al.[J]. Nucl. Geophys, 2, 3(1998).

[6] Masayori I, Tooru K, Keiji K[J]. Nucl. Instrum. and Methods Phys. Res., 453, 614(2000).

[7] Li D, Gang L, Baoyin Z, et al.[J]. PHYSOR2018(2018).

[8] Li G, Zhang B Y, Deng L[J]. ANS Transactions, 109, 1425(2013).

[9] Li G, Deng L, Zhang B Y, et al.[J]. Acta Phys. Sin., 65, 052801(2016).

[10] Liu X G, Deng L, Hu Z H, et al.[J]. Acta Phys. Sin., 65, 092501(2016).

[11] [J].

[12] Fu Y G, Deng L, Li G[J]. Acta Phys. Sin., 67, 172802(2018).

[13] Cai S H[J]. Physics, 25, 12(1996).

[14] Huang L J[J]. Principle of Radiation Oil Well-logging(1985).

[15] Zhu Z D, Luan S W, Cheng Z H, et al.[J]. Energy Spectrum Well-logging Based on Ratio of Carbon and Oxygen(1984).

[16] Deng L[J]. Ph.D. Dissertation(2001).

[17] Berger M J, Scltzer S M[J]. Nucl. Instrum. Methods, 104, 317(1972).

[18] Jin Y, Gardner R P, Verghese K[J]. Nucl. Instrum. Methods, 242, 416(1986).

[19] Li D, Shao H C, Zheng F H[J]. J. Nucl. Sci. Technol., 33, 9(1996).