DECONTAMINATION SIMULATION BASED ON DETAIL CS-137 SOIL CONTAMINATION MAPS

Chesnokov A.V., Govorun A.P., Potapov V.N., Shcherbak S.B.
RECOM LTD, Russian Research center "Kurchatov Institute"
Schukinskaya St. 12-1, Moscow, 123182, Russia



Vast areas contaminated from accidents at the Chernobyl NPP and the "Mayak" facility require the decontamination actions now. An effective measuring method of a 137-Cs soil deposit in-situ is developed for detail mapping of the these areas. Using this method an electronic contamination maps (scale 1:5000 or 1:2000) for settlement Haltch (Gomel region of Belorus) and the Techa river flood plain near Muslumovo (Chelyabinsk region of Russia) are made now. They may be considered as a separate contamination levels of GIS developed for these areas. Based on contamination maps a decontamination simulation of these territories was carried out. A maps of equivalent dose rate (EDR) distributions were calculated for two decontamination procedures: the removing of upper contaminated soil layer and the covering of them by clean sand. A total volume of soil removed and clean sand of covering was calculated too. An efficiency of decontamination is calculated as a relation of average EDR before and after decontamination. Other possible approach of decontamination actions is to reach a safety EDR level at the considered area. Results of simulation of these actions are presented as a calculated map of soil layer thickness which should be removed for reducing of the EDR down to the level required.