【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。更多还原

【Abstract】 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.更多还原