Shima K, Mihara T, Umetani K, Mikumo T
Radioisotopes. 1980 Aug;29(8):363-7.
Observation of gamma-ray background has been done by using a Ge(Li) semiconductor detector when it was placed inside the lead shielding material. With the aid of a very simple model calculation, the concentration of 210Pb radioisotope embedded in the lead material has been estimated to be 0.1-0.4 (Bq/Pb-g) (3-12 (pCi/Pb-g). The origin of Pb-KX-ray emission, the highest peak in the background spectrum, has been investigated by comparing the 210Pb-47 keV gamma-ray and Pb-KX-ray peak counts. As the results, about 50 +/- 30% of Pb-KX-ray production is estimated to be due to the Pb-K shell photoionization which is induced by the bremsstrahlung of 210Bi beta-ray.
当锗（锂）半导体探测器置于铅屏蔽材料内部时，已利用其对伽马射线背景进行了观测。借助非常简单的模型计算，估计铅材料中所含210Pb放射性同位素的浓度为0.1 - 0.4（贝可勒尔/克铅）（3 - 12（皮居里/克铅））。通过比较210Pb - 47千电子伏特伽马射线和铅 - KX射线的峰计数，对背景光谱中最高峰——铅 - KX射线发射的起源进行了研究。结果表明，估计约50±30%的铅 - KX射线产生是由于210Biβ射线的韧致辐射所诱发的铅 - K壳层光电离。
