“…Deuterium retentions were obtained to be 0.0031 (294 K), 0.0021 (573 K) and 0.0004 (773 K) in D/W and these are shown in Fig. 5, comparing with hydrogen or deuterium retention in W deposits formed by sputtering-deposition process [2,3,9,10]. Basically, the amount of hydrogen isotope retention, which is referred as hydrogen isotope-trapping capacity, decreases with increasing temperature.…”