摘要
使用自行设计的超高真空金属系统和气体样品净化装置，以引进的Ｇａｓｔｒａｃｅ－ｓ型气体分析四极质谱计为分析器，以纯度为９９９％的３Ｈｅ和４Ｈｅ气体为标准气样，对微量气体样品中Ｈｅ同位素的四极质谱峰高比测定法进行了实验研究。结果表明，Ｚｒ－Ａｌ活性气体吸收剂能在３９０ｓ内将活性杂质气体含量为４０．７％的３Ｈｅ气体样品净化到接近１００％。当Ｈｅ进样量＞５×１０－７ｍｌ．ａｔｍ时，仪器灵敏度稳定，Ｓ（３Ｈｅ）／Ｓ（４Ｈｅ）＝０．４１，在本系统中，仪器对Ｈｅ原子的探测极限达到了１０１０。
Experiments are made for measurement 3He release from metal tritides by using ultravacuum metal system and gas purification line which is designed by the authors. 3He analysis are performed by a set of Gastrace quadrupole mass spectrometer (QMS). With 3He and 4He standards of 99. 9 %purity, the QMS peak height ratio of helium isotopes in trace gaseous samples are measured. Results show that Zr-Al gas getter can purificate out any impurities in 3He sample, and the purity of sHe can be increased to nearly 100 % from 40. 7 % within times of 390 s. When the input quantity of He is more than 5 × 10-7 ml' atm, the sensitivity of QMS can be maintained stably, and S3He/S (4He)equal to 0. 41. The detec limitation of such system for He is 1010 atoms.
出处
《原子能科学技术》
EI
CAS
CSCD
北大核心
1996年第1期55-61,共7页
Atomic Energy Science and Technology
基金
中国工程物理研究院科学基金
关键词
氦同位素
氚化物
四极质谱法
Helium isotope Metal tritides Quadrupole mass spectrometric
