^（232）U示踪法测定样品中铀钍同位素的比活度

DETERMINATION OF SPECIFIC ACTIVITY OF URANIUM AND THORIUM ISOTOPES IN SAMPLES BY ^(232)U TRACER METHOD

本文介绍了用（２３２Ｕ）作示踪同位素，测定岩石、土壤、水体中铀同位素及岩石中钍同位素比活度的方法。详细介绍了用两种标准方法［１．２］对样品进行化学富集、纯化、分离以及用电沉积法制备铀、钍α源的方法。对α射线多道能谱测量系统的配置，工作条件的选择，本底测定，实验样品的测定，推导出的计算公式、测量结果等均做了详实的论述。

This paper presents a determination method of specific activity for uranium isotope in rocks, soil, water and thorium isotope in rocks using 232U as a tracer isotope. A detailed introduction is given to the chemical preconcentration, purification and separation of samples with two standard methods and the electric deposit method for the preparation of the a source of uranium and thorium. The collocation of the a-ray multi-channel spectrometric system,the selection of the working conditions, the determination of the background and test samples, the deduced calculation formula and the analytical results are discussed in detail.