Abstract: It is very important to determine annual radiation dose in luminescence dating and electron spin resonance dating. The aim of this paper is to calibrate low background Daybreak 582 and 583 thick source alpha counter (TSAC) which is used extensively in OSL dating lab by comparison of different standard sources. Meanwhile we analyze the factors such as efficiency of ZnS scintillator,measurement time,and the loss of radon,grain size,moisture,colour of sample on alpha counting,and provide some suggestions for improvement of accuracy.

Key words: luminescence dating, annual dose, thick source alpha counting, calibration, loss of radon

摘要： 年剂量测量是释光和电子自旋共振测年的关键之一。厚源α-计数仪(简称TSAC)是年剂量测量中的常用仪器。通过不同标准源的标定对比实验,对美国Daybreak公司582,583型低本底厚源α-计数仪的高压值(HV)和积分甄别器阈值(DISC)进行了标定。同时,对测量过程中的诸多影响因素如被测样品的氡逃逸、粒度、含水量、颜色以及ZnS闪烁屏的密度、测量时间等开展了初步的实验研究,并根据实验结果提出了针对本型号仪器在实际测量时的改进措施,以提高厚源α-计数仪的测量精度。

关键词: 释光测年, 年剂量, 厚源α-计数仪, 标定, 氡逃逸