Use of CFD by IDQBRN for Radiological Defense Using CTBTO Radionuclide Measurements

The Institute of Chemical, Biological, Radiological and Nuclear Defense (IDQBRN) is part of the Brazilian Army's Chemical, Biological and Nuclear Defense System (SisDQBRNEx), based on the lines of research conducted in its laboratory complex. Through its Computational Fluid Dynamics Laboratory (LFC), has been inserting into its research activities the use of CTBTO data to simulate various scenarios containing the dispersion of radionuclides in the atmosphere, thus predicting response and specific emergency actions. In this work, data inversion was performed to determine the amount of ¹³⁷Cs released during the Fukushima Daichi nuclear accident, followed by a CFD simulation to analyze the behavior of the radioactive cloud at obstacles near the emission source, the dose received and the concentration level of ¹³⁷Cs in the atmosphere. (paper)