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γ谱法测定岩石中钾含量,应该说是比较成熟的一种方法。早在1956年外国学者就研究过γ谱法同时测定不破坏样品中铀、钍、钾含量。在国内应用γ谱法测定过岩石样品中铀、镭和钍,测钾含量甚少,一个主要原因是缺乏相应含钾粉末标准源。 本文配制了一套不同钾含量的粉末源,确定了γ谱法中~(40)K的系数,测定了各类岩石中的钾含量,并取得与化学方法近于一致的结果。
Gamma spectrometry determination of rock potassium content, it should be said that a more mature method. As early as 1956, foreign scholars have studied gamma spectrometry simultaneous determination of uranium, thorium and potassium content in the sample. In the domestic application of gamma spectrometry for the determination of uranium, radium and thorium in rock samples, the measurement of potassium content is very small, one of the main reasons is the lack of corresponding standard source of potassium-containing powder. In this paper, a set of powder sources with different potassium content were prepared, the coefficient of ~ (40) K in γ spectrometry was determined, the potassium content in various rocks was determined, and the results were nearly consistent with the chemical methods.