核化学与放射化学2012，Vol.34Issue(5)：310-315,6.
同位素稀释-负热表面电离质谱法分析土壤样品中的超微量99Tc
Determination of Trace Technetium-99 in Soil Samples by Isotope Dilution/Negative Thermal Ionization Mass Spectrometry
汤磊 1王丽雄 1刘雪梅 1龙开明 1杨通在 1熊宗华 1龚建1
作者信息
- 1. 中国工程物理研究院核物理与化学研究所,四川绵阳621900
- 折叠
摘要
Abstract
As an important long-lived and high-abundance fission product, "Tc dispersed into the environment because of the nuclear test in atmosphere, the nuclear fuel cycle and nuclear medicine. The isotope dilution mass spectrometry (IDMS) technology of measuring 99 Tc using 97Tc as the spike was developed. The chemical separation procedure of Tc is established, and the recovery rate is more than 71% for the overall process. 97Tc (97Tc, 84.77%; 98Tc, 15.03%; "Tc, 0.20%) was prepared by irradiation of natural ruthenium metal, then was calibrated by IDMS with "Tc standard material as the spike. The conventional positive thermal ionization mass spectrometry (TIMS) was inapplicable due to the high ionization potential of 7. 3 eV for technetium, therefore based on MgCl2+Ba(OH)2 as the loading reagent, the negative thermal ionization mass spectrometry of technetium was established, and the ion current indensity of 99TcO-4 (M/z= 163) reached 1. 7 × 10-12 A. Then, 99Tc in the soil samples was quantitatively determined by negative thermal ionization mass spectrometry and isotope dilution method. The combined standard uncertainty is better
than 3%.关键词
99Tc/负热电离质谱/同位素稀释法/97TcKey words
99Tc/ negative thermal ionization mass spectrometry/ isotope dilution method/
97 Tc分类
化学化工引用本文复制引用
汤磊,王丽雄,刘雪梅,龙开明,杨通在,熊宗华,龚建..同位素稀释-负热表面电离质谱法分析土壤样品中的超微量99Tc[J].核化学与放射化学,2012,34(5):310-315,6.
