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Etude régionalisée de l’impact d’une pollution radioactive accidentelle sur le blé d’hiver

Aude Delboe, Catherine Mercat-Rommens
Rapport DEI/SESURE n°2005-15

Document type > *Report/contribution to WG (paper or CD-Rom)

Keywords > agriculture, contamination, releases, sensitivity, vegetables, wheat

Research Unit > IRSN/DEI/SESURE/LERCM

Authors > MERCAT-ROMMENS Catherine

Publication Date > 28/04/2005

Summary

The goal of this study is to evaluate the sensitivity of corn of winter with respect to an  accidental release of radioactivity. We want to know if a uniform and specific deposit would involve the same contamination on the scale of the whole territory. The study was based on the equations of the ASTRAL model which makes it possible to evaluate the transfer of the radionuclides in the terrestrial food chain following an accidental atmospheric emission. The parameter of ASTRAL on which the study concentrated is the factor of transfer of the radioactivity of the air to the grain. This factor depends on the parameters of captation and translocation, since harvest is contaminated when the radionuclides deposited on the leaves are assimilated and transported towards the grain. Methodology thus consisted in regionalizing these two parameters. For that, software STICS (multidisciplinary Simulator for Standard Cultures) developed by the INRA of Avignon was used. This model proposes a daily follow-up of the foliar index, as well as the dates of occurrence of the agronomical stages of corn. These variables were correlated with captation and translocation. The outputs of the simulations carried out on 12 climates and 2 varieties made it possible to express the parameters of captation and translocation according to the typology of ASTRAL, i.e. according to the time deposit-harvest. Then, these values were compared with bibliographical data and with data issued from IRSN programs RESSAC and RADEMIC.

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