氚钛膜中^(3)He释放的研究

Release behavior of ^(3) He from titanium tritide films

在极限真空为２×１０－７Ｐａ的超高真空全金属系统中，用四极质谱计分析了氚钛膜中释放的３Ｈｅ气体及其它杂质气体组分。对两块原子比分别为１．６８和１．６９的氚钛膜中释放的３Ｈｅ经过长达４１０ｄ的测量．结果表明，当样品中３Ｈｅ浓度达到０．１时，３Ｈ３的释放系数仍保持为１０－５量级。振动使氦的释放系数增大了５—１０倍。对氚钛膜中释放的杂质气体组分的研究结果表明，用玻璃真空系统制备的氚化钛样品被油污染比较严重。对氚钛膜中３Ｈｅ的早期释放机理也进行了探讨。

The release behavior of 3He and other impure gases from titanium tritide films were analyzed by a quadrupole mass spectrometer(QMS) in an ultravacuum metal system with a limit vacuum of Z×10-7Pa. The 3He release fraction for two titanium tritide samples with initial atomic ratio of 1.68 and 1.69 were measured in a period of 410 days. It was shown that the release fraction of the two samples was maintained in 10-5 level when the 3He concentration in samples reachs to 0.1, and the release fraction was increased 5-10 times by vibration. Analysis of impurity release from titanium tritide film shows that samples, prepared in a glass vacuum system would be polluted by oil. The mechAnism of early 3He release from titanium tritide was also discussed in this paper.