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1.引言在铀矿普查、勘探的各个阶段,精确地测定镭在岩石样品中的含量,是确定一个矿区内放射性平衡与否、射气扩散程度等一系列问题的不可缺少的一项工作。目前测定岩石样品中镭含量的方法有:射气法和脉冲法。射气法是假定镭和氡之间存在着放射性平衡,利用氡气衰变时所放出的α射线在电离室中产生的电离电流,与引入电离室的
1. INTRODUCTION The accurate determination of the content of radium in rock samples at all stages of the uranium mine survey and exploration is an indispensable task in determining a series of issues such as radioactive balance in a mining area and the extent of air-jet diffusion. The current method of determining the radium content of rock samples: jet method and pulse method. The air-jet method assumes that there is a radioactive balance between radium and radon, the ionization current generated in the ionization chamber by the α-rays emitted by radon decay,