The Preparation of Thin, Uniform, Radioactive Sources by Surface Adsorption and Electrodeposition

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Abstract
Thin, uniform, radioactive sources were deposited by several methods on thin films composed of a sandwich of metal, polystyrene and formvar. Sources of cerium-144, yttrium-91, scandium-46 and ruthenium-106 were prepared by adsorbing the hydrolyzed radionuclides on gold-coated films, while selenium-75, ruthenium-106, iridium-192, cobalt-60 and chromium-51 were adsorbed in the elemental form on magnesium. Ruthenium-106, silver-110, mercury-203, cobalt-60, indium-114, iron-59, chromium-51 and gold-198 were electrodeposited on gold, the plating potential being supplied either externally or by a dissolving magnesium cathode. The uniformity of the sources was evaluated by radioautography, and in the case of Au199 by examining the conversion electron spectrum with a homogeneousfield solenoidal-type beta spectrometer.

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