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土样浸泡测氦法实质上是一种化探方法。 自然界中的氦由~3He、~4He组成。地球上的氦主要是~4He,它是天然放射性元素衰变过程中产生的α粒子与周围介质的两个电子结合而生成的。氦的形成速度极为缓慢,每克铀每年只能生成1.16×10~(-7)毫克的氦。 氦在地壳中存在形式有三种: 1.束缚氦:存在于矿物品格中或岩石、土壤的封闭裂隙中。 2.自由氦:存在于裂隙或连通的孔隙中。
Soil immersion test Helium method is essentially a method of geochemical exploration. Helium in nature consists of ~ 3He, ~ 4He. The Earth’s helium is mainly ~ 4He, which is produced by the binding of the alpha particles generated during the decay of natural radioactive elements to the two electrons in the surrounding medium. The formation of helium is extremely slow, producing only 1.16 × 10 -7 milligrams of helium per gram of uranium per gram. Helium exists in the crust in three forms: 1. Bound helium: exists in the mineral or rock, soil, closed fissures. 2. Free helium: exists in the fissures or communicating pores.