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178m2Hf是一种长半衰期(T1/2=31 a)、高自旋态(Iπ=16+)的Hf同质异能素.利用四川大学CS-30回旋加速器产生的30 MeV,100μA的α束流轰击天然Yb靶,通过176Yb(α,2n)反应制备178m2Hf.采用高纯Ge探测器测量未提纯样品和放化分离后的样品的γ能谱,选取178m2Hf的426,495和574 keV三个特征峰,使用高斯双峰拟合方法解谱,确定了未提纯样品中178m2Hf的含量达到1012量级,提纯后的样品中178m2Hf含量为1011量级.还对靶中其他放射性杂质核素(175Hf,172Lu,172Hf,177Lu,173Lu)的含量进行了分析.
178m2Hf is a Hf isoforms with a long half-life (T1 / 2 = 31 a) and a high spin state (Iπ = 16+) .Based on the 30 MeV and 100μA α beam currents produced by the CS-30 cyclotron at Sichuan University Natural Yb target was prepared by the reaction of 176Yb (α, 2n) to prepare 178m2Hf.Using the high purity Ge detector to measure the γ spectrum of the unpurified sample and the sample after the radiochemical separation, three characteristic peaks of 426, 495 and 574 keV of 178m2Hf were selected, Gaussian bimodal fitting method to determine the unpurified sample 178m2Hf content of 1012 orders of magnitude, the purified sample 178m2Hf content of 1011. Also on the target of other radioactive impurity nuclides (175Hf, 172Lu, 172Hf , 177Lu, 173Lu) were analyzed.