Measurement of Uptake and Release of Tritium by Tungsten

The uptake of tritium by tungsten and its release behavior have been investigated Specimens annealed at 773 K, 873 K, 973 K, 1,073 K and 1,173 K for 3 hours and loaded with tritium at 773 K for 3 hours accumulated 0.125 ppm, 0.068 ppm, 0.067 ppm, 0.038 ppm and 0.033 ppm, respectively (tritium solubilities were 3.6x 10(-9) at.fr.Pa-1/2, 2.0x 10(-9) at.fr.Pa-1/2, 1.9x 10(-9) at.fr.Pa-1/2, 1.1x 10(-9) at.fr.Pa-1/2 and 9.7x 10(-10) at.fr.Pa-1/2, respectively). The difference is attributed to the existence of trapping sites or oxide films.