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Report No.
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Model testing using data on $$^{137}$$Cs from Chernobyl fallout in the Iput River catchment area of Russia

Thiessen, K. M.*; Sazykina, T. G.*; Apostoaei, A. I.*; Balonov, M. I.*; Crawford, J.*; Domel, R.*; Fesenko, S.*; Filistovic, V.*; Galeriu, D.*; Homma, Toshimitsu; Kany$'a$r, B*; Krajewski, P.*; Kryshev, A. I.*; Kryshev, I. I.*; Nedveckaite, T.*; Ould-Dada, Z.*; Sanzharova, N. I.*; Robinson, C.*; Sj$"o$blom, K.-L.*

Data collected following the Chernobyl accident in 1986 have provided a unique opportunity to test the reliability of computer models for contamination of terrestrial and aquatic environments. The Iput River scenario was used by the Dose Reconstruction Working Group of BIOMASS. The test area was one of the most highly contaminated areas in Russia following the accident, with an average contamination density of $$^{137}$$Cs of 800, 000 Bq m$$^{-2}$$ and localized contamination up to 1,500,000 Bq m$$^{-2}$$, and a variety of countermeasures that were implemented in the test area had to be considered in the modelling exercise. Difficulties encountered during the exercise included averaging of data to account for uneven contamination of the test area, simulating the downward migration and decrease in bioavailability of $$^{137}$$Cs in soil, and modelling the effectiveness of countermeasures. The accuracy of model predictions is dependent at least in part on the experience and judgment of the participant in interpretation of input information, selection of parameter values, and treatment of uncertainties.

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