气载放射性物质浓度时空分布及辐射剂量评估OA

Nuclear facilities continuously release airborne radioactive materials during oper-ation.To comprehensively assess the environmental radiation risks posed by these materi-als,this paper develops an off-site atmospheric dispersion and dose assessment system based on the Lagrangian puff model.By coupling multidimensional meteorological fields with turbulence parameterization schemes,the system achieves accurate predictions of the spatiotemporal distribution of radionuclide concentrations under complex terrain conditions.Furthermore,by incorporating the latest dose conversion coefficients from the International Commission on Radiological Protection(ICRP),a dose calculation module covering four critical exposure pathways—air immersion,ground deposition,inhalation,and ingestion—was established,enabling an integrated assessment from source term emis-sion to public effective dose.Comparative validation with the standard model California Puff Model(CALPUFF)at a typical coastal site showed that the simulation errors for con-centration and deposition rates at 92%of the key receptor points were within 20%,dem-onstrating the high reliability of the system.This provides a technical tool compliant with international standards for environmental impact assessment and emergency response evalu-ation of nuclear facilities.