自然金只有一种同位素,~(197)Au。矿石中金的含量极低,在砂矿中其含量为0.5—1g/t,而在原生矿石中其含量为3—10 g/t。金通常以极细小的浸染状存在,虽然已知有大块的自然金存在,但有时也要在显微镜下才能见到它。鉴于金在矿石中含量极低且呈不均匀地分布,因而,目前尚不能用直接的物理方法,其中包括核物理方法进行普查找矿。因此,金矿的普查是利用各种间接的方法来进 Natural gold has only one isotope, ~ (197) Au. The content of gold in the ore is very low, its content is 0.5-1 g / t in the sand and 3-10 g / t in the primary ore. Gold is usually present in very finely disseminated forms, although large, natural gold is known to exist, but sometimes it can be seen under a microscope. Given the extremely low and uneven distribution of gold in ore, direct physical methods, including nuclear-physical methods, are not yet available for general prospecting. Therefore, the gold census is to use a variety of indirect methods to enter