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一、引言在研究单能中子诱发重核裂变时~(144)Ce产额的工作中,由于中子通量比较低,~(144)Ce放射性很弱,且要求准确测定,因此,这是一种十分精细的工作。整个工作包括三个环节:1)从裂变产物混合物中放化分离~(144)Ce;2)制备成适合测量的源;3)准确测定化学产额。
I. INTRODUCTION In the study of the yield of ~ (144) Ce in single-energy neutron-induced heavy fission, radioactivity of ~ (144) Ce is very weak and requires accurate determination because of the low neutron flux. Therefore, It is a very elaborate work. The whole work consists of three steps: 1) radiochemical separation of ~ (144) Ce from the fission product mixture; 2) preparation of a suitable source for the measurement; and 3) accurate determination of the chemical yield.