H2and He discharges in a stellarator produce copious wall bombardment by the plasma ions. The reemission rate of the gas was measured for times of 0.06 to105see after bombardment. The rate was approximately proportional tot−0.6for He andt−0.75forH2. The reemission is also calculated assuming diffusion of the gas in the solid and taking into account the finite nonuniform initial distribution. It follows from the analysis that the rate is proportional tot−nwherenapproaches 0.5 or 1.5 as the ratio of reemission to bombarding time approaches zero or infinity.