-
摘要: 准确定量铀氧化物样品中238U的含量对于裂变产额测量等工作具有重要意义，其定量方法的研究对于涉及238U的绝对测量的诸多实验都具有参考价值。利用四川大学2.5 MeV质子静电加速器产生的准单能中子对八氧化三铀样品进行中子活化，用高纯锗探测器测量活化产物的β衰变子体239Np的277.6 keV特征γ射线，利用已知的活化截面，算出样品中238U的质量占比为79.1%，不确定度为6.2%。利用电感耦合等离子体质谱法对样品中238U的含量进行了测量，其质量占比为59.2%。此外，基于EA3000元素分析仪、卡尔费休电位滴定仪和TGA-DSC2同步热分析质谱联用仪，测知样品中不含N元素，含水量在2.2%以下。并利用PIXE方法排除了样品中含有Al元素以上杂质，利用EPBS方法测知样品中U/O原子数比为1：3.6，误差约2%，推知样品中238U质量占比为80%，验证了活化法测得的238U含量。最终测得样品中238U的质量占比为79.1%，不确定度6.2%。对照按U3O8分子式折算的84.5%，考虑到水分含量等，此结果合理。
The accurate quantification of 238U in uranium oxides is of great importance for measurements of fission yield. The study for the method of 238U quantification has significance to lots of experiments involving absolute measurement of 238U. The reaction (n, γ) in the triuranium octoxide samples was induced by T(p,n)3He quasi-monoenergetic neutrons provided by the 2.5 MeV proton electrostatic accelerator in Sichuan University. The 277.6 keV characteristic γ ray of 239Np that comes from β-decay of the activation product 239U was detected by a HPGe detector. With the known (n, γ) cross section, the mass percentage of 238U in samples was determined to be 79.1%, with the uncertainty of 6.2%. ICP-MS was also used in the quantification of 238U in samples, its result was 59.2%. Meanwhile, the samples were analyzed by other several methods and the results showed that less than 2.2% H2O, no nitrogen, and no other impurity elements above Al were contained in the samples. EPBS was used to measure the atomic ratio of U and O and it was found that the mass percentage of 238U in samples was about 80%, verifying the result 79.1% of INAA.Abstract: The accurate quantification of 238U in uranium oxides is of great importance for measurements of fission yield. The study for the method of 238U quantification has significance to lots of experiments involving absolute measurement of 238U. The reaction (n, γ) in the triuranium octoxide samples was induced by T(p,n)3He quasi-monoenergetic neutrons provided by the 2.5 MeV proton electrostatic accelerator in Sichuan University. The 277.6 keV characteristic γ ray of 239Np that comes from β-decay of the activation product 239U was detected by a HPGe detector. With the known (n, γ) cross section, the mass percentage of 238U in samples was determined to be 79.1%, with the uncertainty of 6.2%. ICP-MS was also used in the quantification of 238U in samples, its result was 59.2%. Meanwhile, the samples were analyzed by other several methods and the results showed that less than 2.2% H2O, no nitrogen, and no other impurity elements above Al were contained in the samples. EPBS was used to measure the atomic ratio of U and O and it was found that the mass percentage of 238U in samples was about 80%, verifying the result 79.1% of INAA.-
Key words:
- quantification of 238U /
- INAA /
- ICP-MS /
- PIXE /
- EPBS
-
[1] FENG Jing, YANG Yi, LIU Shilong, et al. Journal of Nuclear and Radiochemistry, 2010, 32(6):322. (in Chinese) (冯晶, 杨毅, 刘世龙,等. 核化学与放射化学, 2010, 32(6):322.) [2] LI Yingying, LUO Xaobing, WANG Pan, et al. Nuclear Electronics and Detection Tecwhnology, 2016, 36(2):218. (in Chinese). (李映映,肖军,王攀,等. 核电子学与探测技术, 2016, 36(2):218.) [3] WANG Chao, XIAO Jun, WANG Pan, et al. Nuclear Technology, 2016, 39(8):15. (in Chinese) (汪超, 肖军, 王攀, 等. 核技术, 2016, 39(8):15.) [4] YANG Wei, YUAN Guojun, XIAO Caijin, et al. Annual Report For China Institute of Atomic Energy, 2012. (in Chinese) (杨伟, 袁国军, 肖才锦, 等. 中国原子能科学研究院年报, 2012.) [5] MONTOYA E H, MENDOZA P A, BEDREGAL P S. Radioanal Nucl Chem, 2012, 291:175. doi: 10.1007/s10967-011-1273-x [6] ZHU Liuchao, WAN Tongxing, ZHAO Yonggang, et al. Rock and Mineral Analysis, 2015, 34(4):414. (in Chinese) (朱留超, 王同兴, 赵永刚, 等. 岩矿测试, 2015, 34(4):414.) [7] LIU Likun, GUO Dongfa, HUANG Qiuhong. Chinese Journal of Inorganic Analytical Chemistry, 2012, 2(4):10. doi:10.3969/j.issn.2095-1035.2012.04.002. (in Chinese) (刘立坤, 郭冬发, 黄秋红. 中国无机分析化学, 2012, 2(4):10.) [8] LIU Guangshan, HUANG Yipu, LI Jing, et al. Acta Oceanologica Sinica, 2003, 25(5):66. (in Chinese) (刘广山, 黄奕普, 李静, 等. 海洋学报, 2003, 25(5):65.) [9] NEWTON N T, SUDARSHAN K, GOSWAMI A, et al. Journal of Radioanalytical and Nuclear Chemistry, 2009, 279(2):481. doi: 10.1007/s10967-007-7314-4. [10] MA Hongchang, LI Jizhou. Manual on monoenergetic neutron source data of accelerator[M]. Beijing:Institute of Atomic Energy, Chinese Academy of Science, 1976. (in Chinese) (马鸿昌, 李际周. 加速器单能中子源常用数据手册[M]. 北京:中国科学院原子能研究所, 1976.) [11] HUA Yan, ZHU Zuobin, LIU Yiqin, et al. Nuclear Electronics & Detection Technology, 2014, 34(1):86. (in Chinese) (华艳, 朱祚缤, 刘艺琴, 等. 核电子学与探测技术, 2014, 34(1):86.) [12] Fudan University. Experimental method of nuclear physics (I)[M]. Beijing:Atomic Energy Press, 1981:270. (in Chinese) (复旦大学. 原子核物理实验方法(上)[M]. 北京:原子能出版社, 1981:270.) [13] SUN Hongjuan, LUO Xiaobing, LI Chu, et al. Nuclear Electronics & Detection Technology, 2010, 30(2):288. (in Chinese) (孙红娟, 罗小兵, 李初, 等. 核电子学与探测技术, 2010, 30(2):288.) [14] WALLNER A, BELGYA T, BICHLER M, et al. Physical Review Letters, 2014, 112:192501 [15] BULEEVA N N, DAVLETSHIN A N, TIPUNKOV O A, et al. Soviet Atomic Energy, 1988, 65(5):920. [16] POENITZ W P, FAWCETT Jr L R, SMITH D L. Nuclear Science and Engineering, 1981, 78:239. [17] WANG Han, CHEN Hailan, CHEN Zibin. Metallurgical Standardization & Quality, 2009, 47(2):11. (in Chinese) (王晗, 陈海岚, 陈自斌. 冶金标准化与质量, 2009, 47(2):11.) [18] SONG Jun, ZHAO Wei, SONG Gan, et al. Control and Instruments in Chemical Industry, 2011, 38(7):894. (in Chinese) (宋军, 赵薇, 宋刚, 等. 化工自动化及仪表, 2011, 38(7):894.) [19] ZHOU Z, XIA C D. Nucl Instr Meth B, 2015, 346:1. -
点击查看大图
计量
- 文章访问数: 1257
- HTML全文浏览量: 140
- PDF下载量: 133
- 被引次数: 0
下载:
甘公网安备 62010202000723号