Volume 44, Number 5, 2009ECORAD 2008 - Radioecology and Environmental Radioactivity
|Page(s)||731 - 734|
|Published online||06 June 2009|
Ecological half-life of I-131 in milk after dry and wet radionuclide deposition due to the Chernobyl accident
Research Institute of Radiation Hygiene, ul. Mira, 8, 197101 St. Petersburg, Russia
Numerous measurements of 131I 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 131I 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 131I half-life in milk increase from 3.0 d at the smallest area contamination by 137Cs to 5.5–6.0 d at the contamination above the 200 kBq/m2. The half-life of 131I 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 6–9 mm. 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.
© EDP Sciences, 2009
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