Environmental measurements following the Chernobyl accident for selected locations in the United States and Europe were compared with model predictions of the transfer of 137Cs through the air-pasture-cow-milk pathway. The models include IAEA Safety Series No. 57, AIRDOS/EPA, NRC Regulatory Guides 1.109 and 1.111, the National Council on Radiation Protection and Measurements (NCRP) screening model, and the PATHWAY dynamic food-chain model. Time integrals of the 137Cs concentrations in air, pasture, and milk were estimated, and the predicted and observed grass/air, milk/air, and milk/grass concentration ratios were compared. Predictions of the transfer of 137Cs from air to pasture and from pasture to milk tended to exceed observations. Those of PATHWAY, however, consistently underpredicted the grass/air and milk/air concentration ratios due to the use of parameter values specific for the deposition of large particles and their interception and retention by vegetation. Where possible, parameter values were adjusted to the specific conditions determined for a location, which substantially reduced the discrepancy between predictions and observations.
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- A Comparison of Model Predictions and Observations of the Transfer of 137Cs Through the Air-Pasture-Cow-Milk Pathhay
Y. C. Ng
F. O. Hoffman
- Springer Netherlands