The stability of neutron bombardment damage in Sb‐doped Ge has been investigated by making continuous measurements of the electrical conductivity and Hall mobility following a neutron pulse. Measurements were made in the temperature range from 77° to 308°K with a time resolution of 1 sec. At temperatures near 195°K an initial decrease in conductivity and mobility was followed by an additional decrease which exhibited nearly second‐order kinetics. At 273°K and above, an initial decrease in conductivity and mobility was observed, but was followed by a recovery consistent with an activation energy of 0.68 ev. The void region model of Gossick and Crawford has been employed to explain the initial decrease in mobility and a major portion of the initial decrease in conductivity. The transitory changes in mobility and conductivity after the neutron pulse are considered as changes in the void volumes.