Observation of bubbles in gamma-irradiated lithium hydride

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Abstract
Investigations with the electron microscope on γ-irradiated single crystals of LiH have revealed the presence of cubic voids, or bubbles. These bubbles are crystallographically oriented, principally with their sides parallel to the (100) planes of the LiH crystals. Bubbles range in size from ∼ 75 Å to ∼ 1500 Å. Average bubble size increases with increasing irradiation dose and irradiation temperature, with temperature affecting size the most, by far. These bubbles are believed to be responsible for large swelling seen in irradiated LiH by Souers, Blake, Penpraze and Cline (1969).