Tritium distribution on the tungsten surface exposed to deuterium plasma and then to tritium gas

Tungsten (W) samples were exposed to Low-energy (38 eV/D), high flux (1022 D+/m2/s) deuterium (D) plasma at 495, 545 and 550 K to a fluence of 1026 D/m2. After the plasma exposure, tritium was introduced into the samples by exposure to deuterium-tritium gas mixture at 473K. Tritium distribution on the W surface was examined by the techniques of imaging plate and autoradiography. The results of the imaging plate revealed that tritium was concentrated mainly within the area exposed to the D plasma, and the concentration of tritium is slightly varied within the area. Autoradiography of the W surface showed that tritium was concentrated on the grain boundary and blisters. (author)