FIELD: production and application of ionizing radiation sources. SUBSTANCE: source is submerged into fluid-solution. Sample of the composition formed is selected, evaporated and activity of dry residual of the sample is measured by means of radiometer. Activity of the solution is evaluated according to correspondence to standard criteria. Ammonium acetate solution is used as fluid for plutonium-based alpha-radiation source; concentration of the solution is equal to 5-15% at pH being equal or less than 4.8 according to adding of acetic acid. EFFECT: improved efficiency of application.
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