~(235)Th β 衰变端点能量测定中的放化分离
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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）ＭｅAbstract: RADIOCHEMICAL SEPARATION AND INDENTIFICATION IN THE DETERMINATION OF 235Th β DECAY ENDPOINT ENERGYZhang Tianmei Li Wenxin Yuan Shuanggui Xu Shuwei(Institute of Modern Physics,the Chinese Academy of Sciences,Lanzhou 730000)ABSTRACTA radiochemical method of solvent extraction with PMBPCHCl3 has been used to separate thorium from the fission products and irradiated target material in 238U(n,α) 235Th reaction for determination β decay endpoint energy of 235Th.The results indicate that the halflive of 235Th is (73±02) 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 235Th is (144±004)MeV and Qβ=（147±007）MeV.Key words 235Th β decay endpoint energy Solvent extraction PMBP
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[1] １武汉大学化学系等编著．稀土元素分析化学（上）．北京：科学出版社，１９８１．１４９２袁双贵，徐树威，张天梅，等．半导体望远镜β射线谱仪．核技术，１９８９，１２（５），２７３３ＤｕＹｉｆｅｉ．ＰＣ－ＣＡＭＡＣＭｕｌｔｉｐａｒａｍｅｔｅｒＤａｔａＡｃｑｕｉｓｉｔｉｏｎＳｙｓｔｅｍ．ＡｎｎｕａｌＲｅｐｏｒｔｏｆＩｎｓｔｉｔｕｔｅｏｆＭｏｄｅｒｎＰｈｙｓｉｃｓ．１９９０，１２３４ＹｕａｎＳｈｕａｎｇｇｕｉ，ＺｈａｎｇＴｉａｎｍｅｉ，ＸｕＳｈｕｗｅｉ，ｅｔａｌ．Ｄｅｔｅｒｍｉｎａｔｉｏｎｏｆｔｈｅ２３５Ｔｈβ－ＤｅｃａｙＥｎｄｐｏｉｎｔＥｎｅｒ－ｇｙ．ＰｈｙｓＲｅｖＣ，１９８９，３９（１）：２５６５ＭｉｒｚａｄｅｈＳ，ＣｈｕＹＹ，ＫａｔｃｏｆＳ，ｅｔａｌ．Ｄｅｃａｙｏｆ７．３ｍｉｎ２３５Ｔｈａｎｄ２４．６ｍｉｎ２３５Ｐａ．ＰｈｙｓＲｅｖＣ，１９８６，３３：２１５９６ＡｓｇｈａｒＭ，ＥｍｓａｌｅｍＡ，ＣｈｅｒｙＲ，ｅｔａｌ．Ｔｈｅ２３８Ｕ（ｎ，α）２３５ＴｈＲｅａｃｔｉｏｎＷｉｔｈＴｈｅｒｍａｌＮｅｕｔｒｏｎｓ．ＮｕｃｌＰｈｙｓＡ，１９７６，２５９：４２９
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