串道现象对测量结果的影响

发布时间：2018-05-24 12:39

本文选题：低本底α/β测量仪 + 串道现象　；参考：《原子能科学技术》2017年07期

【摘要】：为更加准确地评价低水平放射性样品的测量结果,利用低本底α/β测量仪研究了串道现象对测量结果的影响及其影响程度。利用239Pu和90Sr-90 Y电镀源测定了α通道与β通道之间的串道因子,结果表明:α通道对β通道的串道现象明显,在样品测量时应考虑扣除串道带来的计数;β通道对α通道的串道影响很小,但在β净计数率足够高时,仍会对α的测量结果带来明显影响。样品测量过程中,考虑到不同α核素导致的串道因子之间的差异,为避免单一核素刻度串道因子引入新的误差,使用合适的遮挡物完全屏蔽样品中的α射线,可确保测量结果更加准确。
[Abstract]:In order to evaluate the measurement results of low level radioactive samples more accurately, the effect of series channel phenomenon on the measurement results and the degree of influence were studied by the low background alpha / beta measuring instrument. The series channel factors between the alpha channel and the beta channel were measured by 239Pu and 90Sr-90 Y electroplating sources. The results show that the channel phenomenon of the alpha channel is obvious to the beta channel, and the sample is in the sample. In the measurement of the product, the counting of the series of channels should be taken into consideration; the effect of the beta channel on the sequence of the alpha channel is small, but when the beta net counting rate is high enough, it will still have a significant influence on the results of the alpha measurement. In the sample measurement, the difference between the series factors of different alpha nuclides is taken into account, and the new method is introduced to avoid the new series factor of the single nuclide scale. The accuracy of the measurement can be ensured by using the appropriate shielding to completely shield the alpha rays in the sample.
【作者单位】：中国辐射防护研究院;
【基金】：环保公益性行业科研专项课题资助项目(201509074)
【分类号】：O657.4

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