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制作穆斯堡尔源~(57)Co的纯度要求很高,杂质含量应小于0.12μg/mCi~(57)Co。稳定性钴含量的增加,使源的线宽加宽甚至发生劈裂现象。降低稳定性钴含量的办法,即可在照射前对靶材料进行纯化,也可在照射后利用核衰变特性和放化分离法相结合,进行钴的同位素分离。本文报导了采用α-粒子轰击镍试制~(57)Co的实验结果。 1.照射靶的制作 天然镍有五种同位素,其中~(58)Ni的丰度最高(67.88％)。α轰击天然镍除得到~(57)Co外,还可生成十多种其
The production of Mossbauer source ~ (57) Co requires very high purity and its impurity content should be less than 0.12μg / mCi ~ (57) Co. The stability of the cobalt content increases, the source line width widened or even splitting phenomenon. The method of reducing the stability of the cobalt content can be used to purify the target material before irradiation, and the isotope separation of cobalt can also be performed by combining nuclear decay properties and radiochemical separation after irradiation. This paper reports the experimental results of the trial production of ~ (57) Co using α-particle bombardment of nickel. 1. Preparation of irradiation target Natural nickel has five isotopes, of which 58 Ni is the highest (67.88%). Alpha bombardment of natural nickel addition to ~ (57) Co, but also generate more than ten kinds of them