Formation and annihilation of lithium colloids and hydrogen bubbles in irradiated LiH

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Abstract
Formation and annihilation of Li colloids and hydrogen bubbles in LiH have been studied with optical absorption ESR and thermoluminescence. The optical absorption measurements of irradiated LiH gave S- and colloid bands as well as a broad band. The theoretical calculation using Mie theory shows that the observed S- and colloid bands can be ascribed to large and small Li colloids with radii of 220 and 50 AA, respectively. Extended calculation of light scattering by bubbles or voids indicates that the observed broad band is due to hydrogen bubbles with radii less than 600 AA. The colloids and bubbles are annealed out above 80 degrees C; accompanying thermoluminescence follows second-order kinetics. The possible models of the annihilation of colloids and bubbles in LiH are presented.