Temperature dependence of helium release from erbium tritide films

The rates of helium release from ErT2 films were measured during constant temperature storage (ranging from 77--500 K) and following abrupt temperature changes. Large changes in helium release rates were measured immediately following the temperature changes; however, the helium release rates were only slightly temperature dependent following the initial transient response. The helium concentration which corresponds to the onset of accelerated release is found to be a function of temperature for ErT2 films. It is also shown that an ErT2 film that is in accelerated release can be made to release helium at a low rate after decreasing the helium concentration by means of a high-temperature cycle