He Release and Structure Evolution of Aging Zirconium Tritide

Helium release and structure evolution of Zr tritide with fct-ZrH_1.801 phase were investigated. It proves that the ³He release fraction is between 10 ^-6 and 10 ^-5 while n(³He_gen)/n(Zr) is smaller than 0.27. The ³He generated is trapped deeply in the tritide. The release fraction varies in wave with the temperature change between summer and winter. X-ray diffraction results show that the cell volume experiences increase, invariablenes and decrease with the n(³He_gen)/n(Zr) increasing.