The effects of various factors (composition of mixture, relationship between the mass of mixture and sample, value of the Ni : S ratio, fusion time, and temperature) on the conditions of the fire assay concentration of the noble metals with nickel sulfide were investigated, and a method proposed for their quantitative separation from different geological matrices with a neutron activation determination for up to 10-1-10-3 ppb. The proposed method is used to analyse geological samples, i.e., ores, stones, iron meteorites, chromites, soil and lunar rocks.

Sedimentation Sediments 4 UpliftSeveral possible methods for the analysis of important environmental materials have been examined. The role of nuclear -physical methods , including activation methods using reactor neutrons is highlighted. The main steps of analysis (sample preparation, irradiation conditions, information processing and interpretation of results) is discussed. Attention is also paid to the necessity of using other methods of analysis, and the coordination and widening of International collaborative programme in the field of ecological investigations.

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