很贵的拉小朋友,哈哈
http://www.sciencedirect.com/science/article/pii/S0969804398001456
Comparison between (n–γ), (γ–γ) and natural γ-ray activity techniques for ash measurement of coal samples M. Nezamzadeh,Sh. Alavi,M. Lamehi-rachti,N. Rahimian,M. Ghiassi-Nejad

Nuclear Research Center, Atomic Energy Organization of Iran, P.O. Box 11365-8486, Tehran, Iran
Received 22 January 1998Revised 1 July 1998Available online 9 February 1999
http://dx.doi.org/10.1016/S0969-8043(98)00145-6, How to Cite or Link Using DOI
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