俺只有这么些积分了，都拿出来了。望大侠们帮帮忙。

1、标题：On-line determination of the ash content of coal using a “Siroash” gauge based on the transmission of low and high energy γ-rays
    作者：R. A. Fookes, V. L. Gravitis, J. S. Watt, P. E. Hartley and C. E. Campbell
    卷号：The International Journal of Applied Radiation and Isotopes Volume 34, Issue 1, January 1983, Pages 63-69 


2、标题：Feasibility studies of low energy γ-ray techniques for on-line determination of ash content of coal on conveyors
    作者：R. A. Fookes, V. L. Gravitis, J. S. Watt, C. E. Campbell and E. Steffner
    卷号：The International Journal of Applied Radiation and Isotopes Volume 34, Issue 1, January 1983, Pages 37-44

3、 标题：Field trial of a pair production gauge for the on-line determination of ash in coal on a conveyor belt
    作者：M. J. Millen, B. D. Sowerby等
    期刊及卷号：The International Journal of Applied Radiation and Isotopes Volume 35, Issue 11, November 1984, Pages 1009-1021

4、标题：Correction of pair production gauge ash determinations for changes in coal ash composition
  作者：M. J. Millen and B. D. Sowerby
  期刊及卷号：The International Journal of Applied Radiation and Isotopes Volume 36, Issue 8, August 1985, Pages 627-633