摘要
实现了亚微克量级钡的热表面电离质谱(TIMS)测量。铼带经除钡处理后,用磷酸作发射剂和稳定剂,提高了钡的采集率、离子流幅度和稳定度,当138Ba的离子流为(1～3)×10-12A时,137Ba与138Ba的同位素丰度比值的相对标准偏差可达到0 02%。实验还表明钡同位素分析中的分馏效应不明显。
The isotopic abundence ratios for barium at sub-microgram level are analyzed by thermal surface ionization mass spectrometry (TIMS). Rhenium trips used for sample preparation are firstly treated to (eliminate) possible harium background interference. During the preparation of barium samples phosphoric acid is added as an emitting and stabilizing reagent. The addition of phosphoric acid increases the collcction efficiency and ion current strength and stability for barium. A relative standard deviation of (0.02%) for the isotopic abundence ratio of^(137)Ba to^(138)Ba is achieved when the^(138)Ba ion current is (1～3)×10^(-12)A. The experimental results also demonstrate that the isotope fractionation effect is negligibly small in the isotopic analysis of harium.
出处
《核化学与放射化学》
CAS
CSCD
北大核心
2004年第2期122-124,共3页
Journal of Nuclear and Radiochemistry
基金
中国工程物理研究院预先研究基金资助项目(2002421050401)
