Sodium fires and aerosols. Behavior of radioiodine.:Behavior of Radioiodine

概要

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Release of 131I associated with burning of contaminated Na, decay of airborne concentration of the released 131I and the size distribution of aerosols referred to radioiodine are investigated in experimental runs conducted on laboratory scale. These investigations are carried out in conjunction with similar investigations for the Na matrix. An experimental chamber (5.4 m3) is used for burning a small pool of Na (50 g) containing spiked 131I (40500 μCi). Values of the specific activity ratio, viz, the ratio of the concentration of 131I in the aerosol Na to that in pool Na lay in the range of 0.9×10-25.7×10-2 at pool temperatures of about 300°C. The concentration decay half-time and the aerosol size distribution charac-teristics referred to 131I remain similar to those applicable to the Na content of the aerosols. Surface concentrations of 131I in the residues examined differ from the bulk concentrations (calculated) in the pool and are lower by a factor of 20. The concentrations of 131I in the aerosols released are further lower than the surface concentrations in the residues by a factor of 2.
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