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研究了125I种子源的自屏蔽、不同容器和容器的形状、源的几何位置等对125I种子源表观活度测量的影响。结果表明,低能125I种子源表观活度的测量只有在严格规定的条件下才能进行较准确的测量。因此为用户测量125I种子源的表观活度提供几点建议:选用材质为聚丙烯的标准尖底放免管作为测量容器;逐个测量;测量时,源必须放在托盘中心。
The effects of 125I seed source self-shielding, different container and container shape, source geometry position on the measurement of 125I seed source apparent activity were studied. The results showed that the measurement of the apparent activity of low-energy 125I seeds could only be measured accurately under the strict conditions. Therefore, to provide some suggestions for users to measure the apparent activity of 125I seed sources: Select standard polypropylene tubes as measuring containers; measure one by one; the source must be placed in the center of the tray during the measurement.