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Numerous measurements of 131 I concentration in milk following the Chernobyl accident have shown a wide range of clarification half-life values. By results of spectrometric measurements of the milk, performed in 1986 in Tula region (Russia), a connection between a 131 I decreasing half-life in milk and a level of radioactive contamination in a locality and a level of precipitation during passage of a radioactive cloud is analysed. Values of the 131 I half-life in milk increase from 3.0 d at the smallest area contamination by 137 Cs to 5.5-6.0 d at the contamination above the 200kBq/m 2 . The half-life of 131 I removal from milk depends on the precipitation level at the time of radioactive fallouts in places of milk sampling. Tef increases from 2.8-3.5 d (dry deposition) to the value 5.5-6.0 with precipitation increasing up to 6-9mm. The half-life value does not change with further precipitation increase. This finding should be taken into account in thyroid dose estimations for inhabitants of contaminated areas.

Ecological half-life of I-131 in milk after dry and wet radionuclide deposition due to the Chernobyl accident