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误差函数由于其独特的性质在Si(Li)、Ge、NaI探测器的响应函数中得到应用。本文给出了这几种探测器响应函数的表达式及拟合实例,其中误差函数在NaI探测器响应函数的应用是一个新的尝试。本文描述强度平衡法用于测定 ̄(181)Hf活度和γ射线发射几率。方法的原理是母核活度等于到达子核基态上所有射线的强度之和,对于 ̄(181)Hf,这些射线由约97%的γ射线和约3%的转换电子组成。用HPGe探测器测量γ射线发射几率,用文献转换系数计算转换电子发射率。测量活度的总不确定度为±0.8%,482.0keVγ射线发射串测定为0.8055±0.0048。仔细讨论了测量结果的误差,并同文献给出的数据作了比较。
The error function is used in the response function of Si (Li), Ge, NaI detectors because of its unique properties. In this paper, the expressions and fitting examples of these detector response functions are given. The application of the error function to the NaI detector response function is a new attempt. Described herein is the use of the intensity balance method to determine ¯ (181) Hf activity and γ-ray emission probability. The rationale for the method is that the activity of the mother nucleus equals the sum of the intensities of all the rays that reach the ground state of the nucleus, and for ~ (181) Hf these rays consist of about 97% gamma rays and about 3% of the converted electrons. The probability of γ-ray emission was measured with a HPGe detector and the conversion electron emissivity was calculated using the literature conversion coefficient. The total uncertainty of measurement activity was ± 0.8%, and the 482.0 keV gamma ray emission was measured as 0.8055 ± 0.0048. The errors of the measurement results are carefully discussed and compared with the data given in the literature.