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在细粒热释光测定年代中，真实的α剂量必须被转换成与β等效的内照射剂量，这个转换由α内照射效率Ｋ值完成。但对每个样品来说，这个Ｋ值是无法测定的，能测到的只是每个样品的α外照射效率Ｋ３．７。为此，研究了α内、外照射效率的转换系数以及测定的方法。结果表明，与石英近似的ＣａＳＯ４的α内外照射效率的转换系数在考古样品中为０．８４７，与理论计算值０．８５很一致。
In the era of fine-grained thermoluminescence measurements, the true alpha dose must be converted to an equivalent internal bolus dose of beta, this conversion being accomplished by the alpha-gamma irradiation efficiency. However, for each sample, this K value is unmeasurable, and only the α external irradiation efficiency K3.7 per sample can be measured. For this reason, the conversion coefficient of internal and external irradiation efficiency and the method of determination were studied. The results show that the coefficient of conversion of α and γ radiation efficiency of CaSO4 approximating quartz is 0.847 in archeological sample, which is in good agreement with the theoretical value of 0.85.