Autoradiographs were used to study distribution of uranium and silver-110 in galena crystals grown in or exposed to uranium and silver solutions at temperatures in the range 200 degrees C-600 degrees C. Silver content of galena increases with temperature, and its uniform distribution suggests solid solution. Uranium content decreases with increased temperature of formation, indicating that it is not present in solid solution. Possible explanations of this decrease include decreasing uranium in the solution in which galena grows, decrease in number and size of lattice imperfections, and decrease in size of colloidal uranium oxide particles.

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