USEPA Method 111

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Determination of Polonium-210 Emissions from Stationary Sources – USEPA Method 111

USEPA Method 111 illustrates the determination of polonium-210 content of particulate matter samples collected from stationary source exhaust stacks, and for the use of the data to calculate polonium-210 emissions from individual sources and from all affected sources at a facility.

A particulate matter sample, collected according to Method 5, is analyzed for polonium-210 content. The polonium-210 in the sample is put in solution, deposited on a metal disc, and the radioactive disintegration rate measured. Polonium in acid solution spontaneously deposits on surfaces of metals that are more electropositive than polonium. This principle is routinely used in the radiochemical analysis of polonium-210. Data reduction procedures are provided, allowing the calculation of polonium-210 emissions from individual sources and from all affected sources at a facility, using data obtained from USEPA Methods 2 and 5 and from the analytical procedures described in the method.

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Last Update: October 25, 2006