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经堆中子辐照过的~(154)Sm样品,用阳离子交换法分离纯化,得到~(155)Eu核素。用4πβ-γ符合法测量放射性活度和用小平面Ge探测器测量~(155)Eu衰变发射的γ光子数,精确测定了γ射线的发射几率。对于强γ射线和弱γ射线的不确定度分别为1.7％和4.5％。与文献报道值相比较,本测量结果明显改善。
The ~ (154) Sm samples irradiated by heap neutrons were separated and purified by cation exchange to obtain ~ (155) Eu nuclides. The radioactive activity was measured by the 4πβ-γ coincidence method and the γ-ray number emitted by the decay of ~ (155) Eu was measured by the Ge planar detector. The emission probability of γ-rays was accurately determined. The uncertainty for strong γ-rays and weak γ-rays is 1.7% and 4.5%, respectively. Compared with the reported value in the literature, the measurement results improved significantly.