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56Co是β+和电子俘获衰变核素,19.58%为β+衰变方式,80.42%为电子俘获衰变方式,并发射数十条γ射线,最终衰变到56Fe基态,半衰期为77.236(26)d。由于子核的原子序数比较低,且发射的γ射线能量较高,因而内转换系数特别小甚至可忽略不计。56Co是高能区γ探测器效率刻度的重要核素,准确测量其活度,对γ谱仪效率的校准具有十分重要的意义。绝对测量装置主要为
56Co is β + and electron capture decay nuclide, 19.58% is β + decay mode, 80.42% is electron capture decay mode, and emits dozens of gamma rays, eventually decay to 56Fe ground state with a half-life of 77.236 (26) d. Due to the relatively low atomic number of the nuclei and the high energy of the emitted gamma rays, the internal conversion coefficients are particularly small or even negligible. 56Co is an important nuclide for the γ detector efficiency scale in high energy zone. It is very important to calibrate the γ spectrometer efficiency by accurately measuring its activity. Absolute measurement device mainly