<sup>175</sup>Hf的半衰期测量

¹⁷⁵Hf的半衰期测量

1.
State Key Laboratory Breeding Base of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, China
2.
Academy of Nuclear Science and Engineering, East China University of Technology, Nanchang 330013, China
3.
China Institute of Atomic Energy, P. O. Box 275(126), Beijing 102413, China

摘要: ¹⁷⁵Hf现有的半衰期数据偏少且分歧较大，对核参数的准确使用不利。本实验通过加速器质子束流轰击¹⁷⁵Lu，并使用HDEHP萃淋树脂进行离子交换，得到无载体无¹⁸¹Hf干扰的高纯度¹⁷⁵Hf液体测量源，对其中的杂质⁶⁵Zn与⁵⁶Co的去污因子分别为5.2×10³与2.3×10³；引入一固定位置的监督源¹³⁷Cs与¹⁷⁵Hf进行了40 d的连续测量，对343 keV以及661 keV γ射线计数率的比值关于测量时间进行线性拟合，得到¹⁷⁵Hf的半衰期为(70.73±0.25) d，并对测量结果进行了相关检验。
- ¹⁷⁵Hf /
- 半衰期 /
- 无载体
Abstract: The existing data of ¹⁷⁵Hf half-life are few and have large differences, which is unfavorable to use nuclear parameters accurately. In this experiment, ¹⁷⁵Lu was bombarded by accelerator proton beam and purified by HDEHP extraction leaching resin. Then high purity ¹⁷⁵Hf was obtained，which is free carrier and no interference of ¹⁸¹Hf. Decontamination factors for ⁶⁵Zn and ⁵⁶Co respectively are 5.2×10³ and 2.3×10³. ¹³⁷Cs, as a supervision source, was measured lasting 40 days with ¹⁷⁵Hf. The half-life value of ¹⁷⁵Hf is (70.73±0.25) d obtained by fitting the relation between the ratio of 343 keV and 661 keV γ-ray counting rate and time.
- ¹⁷⁵Hf /
- half-life /
- non-carrier

[1]	Firestone R B, Shirley R S, Baglin C M, et al. Table of isotopes[M]. 8th Edition. New York: John Wiley & Sons INC, 1996.
[2]	Wilkinson G, Hicks H G. ¹⁷⁵Hf, a new radioactivive isotope hafnium[J]. Phys Rev, 1949, 75(4): 696-698.
[3]	Rao C L, Yaffe L. Nuclear reactions induced in tantalum by protons of energy up to 84 MeV[J]. Can J Chem, 1963, 41（10）: 2516-2532.
[4]	Popov Y S, Zakharova L V, Markushin M N, et al. Decay of ¹⁷⁵Hf and ¹⁸¹Hf[J]. Radiochemistry, 2001, 43(6): 481-484.
[5]	Fang K H, Wang D W, Yang S B, et al. Half life of ¹⁷⁵Hf[J]. Appl Radiat Isot, 2012, 70: 2328-2331.
[6]	周丰群，杨景康，拓飞，等.HPGe-γ谱仪死时间校正方法的实验研究[J].高能物理与核物理，2005，29(12)：1175-1178.
[7]	秦建国，赖财锋，张信威，等.高强度短寿命核素对其他峰计数率和半衰期影响的研究[J].核电子学与探测技术，2013，33(4)：442-446.
[8]	Pommé S. Problems with the uncertainty budget of half-life measurements[J]. ACS Symposium, 2007: 945.
[9]	张小林，王世联，凡金龙，等.¹⁰¹Mo半衰期的测定[J].核电子学与探测技术，2006，26(6)：893-895.
[10]	Han J, Lee K B, Park T S, et al. ¹⁸F half-life measurement using a high-purity germanium detector[J]. Appl Radiat Isot, 2012, 70（11）: 2581-2585.