“…Tritium diffusion as T þ was also measured for solid Flibe at temperatures from 350 to 400°C [13]. Solubility measurements, made for H 2 , D 2 , HF and DF in Flibe at 500-700°C, indicated that the solubility of H 2 and D 2 was about a factor of 100 less than that for HF and DF at 600°C [14,15].…”