~(235)Th  β 衰变端点能量测定中的放化分离

~(235)Th β 衰变端点能量测定中的放化分离

摘要

摘要: 采用ＰＭＢＰ－ＣＨＣｌ３溶剂萃取法从２３８Ｕ（ｎ，α）２３５Ｔｈ反应的靶材料、裂变产物及其它反应产物中分离钍，以测定其β端点能量。结果表明，２３５Ｔｈ的半衰期为（７．３±０．２）ｍｉｎ，与文献值吻合。此流程的分离时间约２７ｍｉｎ，化学产额约２５％，２３５Ｔｈ源的γ谱中仅有少量的碘和碲沾污。测得的２３５Ｔｈ的β端点能量为（１．４４±０．０４）ＭｅＶ，从而确定其Ｑβ＝（１．４７±０．０７）Ｍｅ

Abstract: RADIOCHEMICAL SEPARATION AND INDENTIFICATION IN THE DETERMINATION OF 235Th β DECAY ENDPOINT ENERGYZhang Tianmei Li Wenxin Yuan Shuanggui Xu Shuwei(Institute of Modern Physics,the Chinese Academy of Sciences,Lanzhou 730000)ABSTRACTA radiochemical method of solvent extraction with PMBPCHCl3 has been used to separate thorium from the fission products and irradiated target material in 238U(n,α)　235Th reaction for determination β decay endpoint energy of 235Th.The results indicate that the halflive of 235Th is (73±02) min which is in good agreement with the reference value. The separation time of this procedure is about 27 min and the chemical yield is close to 25%.Measured β decay endpoint energy of 235Th is (144±004)MeV and Qβ=（147±007）MeV.Key words 235Th β decay endpoint energy Solvent extraction PMBP

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