^(235)Th β 衰变端点能量测定中的放化分离  

RADIOCHEMICAL SEPARATION AND INDENTIFICATION IN THE DETERMINATION OF 235 Th β DECAY ENDPOINT ENERGY

作　　者：张天梅[1] 李文新[1] 袁双贵[1] 徐树威[1] 

机构地区：[1]中国科学院近代物理研究所

出　　处：《核化学与放射化学》1997年第4期47-51,共5页Journal of Nuclear and Radiochemistry

基　　金：国家自然科学基金

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．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.

关 键 词：β端点能量 萃取 PMBP 钍235 衰变 Β衰变 

分 类 号：O614.42[理学—无机化学]