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在寻找铀矿时,一般假设母体铀同位素~(238)U处于平衡状态,因而往往把探测γ射线或α粒子的地面和航空测量方法作为主要工具。然而在~(238)U到~(206)Pb衰变系列中,13个主要的不稳定核素均有各自独特的化学和物理性质,从而导致了不平衡。在~(238)U系列中,最重要的是长寿命核素~(234)U、~(230)Th、~(226)Ra和~(222)Rn。通过化学和物理的方法,它们能从其母体中分离出来。在有利的气候(如潮湿环境)和地质(如可渗透的含水层)条件下,这些核素有可能互相分离或从母体~(238)U中得到分离。不平衡有两个基本类型:(1)“残余子体”,
When looking for uranium, it is generally assumed that the uranium isotope 238 U is in a state of equilibrium, and ground and aeroscopic methods of detecting gamma rays or alpha particles are often the primary tools. However, in the ~ (238) U ~ (206) Pb decay series, the 13 major unstable nuclei have their own unique chemical and physical properties, leading to imbalance. Among the 238 U series, the most important are long-lived nuclides ~ (234) U, ~ (230) Th, ~ (226) Ra and ~ (222) Rn. By chemical and physical methods, they can be separated from their precursors. These nuclides are likely to separate from each other or be separated from the parent (238) U in favorable climates (such as humid environments) and geology (such as permeable aquifers). There are two basic types of imbalances: (1) “Residues,”