在找矿、勘探、开采过程中，常常需要知道岩（矿）石的密度值。习惯上常用物理方法测量岩（矿）石的密度（例如石腊方法等）。这些测密度方法与γ法相比，后者具有工作方法简单快速、精确、代表性好、费用低等优点。所以自50年代末有人提出用γ法测密度的方法以后，在60年代已有人开始重点研究，至70 In the prospecting, exploration, mining process, often need to know the rock (ore) stone density value. It is customary to use physical methods to measure the density of rock (rock) (eg paraffin method, etc.). Compared with the γ method, these methods of density measurement have the advantages of simple, rapid, accurate and representative methods and low cost. Therefore, since the late 1950s when someone proposed the method of measuring the density by γ method, in the 1960s, some people started to focus their studies to 70