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Some radionuclides that make up the radioactive series are noted for their contribution to the total exposure to which individuals are subjected, an important example is known as radon Rn and their descendants, responsible for more than half of the radiation dose received by the population due to natural sources. In this work the effective dose received by the workers of the Management of Radioactive Waste in IPEN due to inhalation of Rn in storage sheds from treated and untreated radioactive waste was evaluated. Concentrations of Rn inside the sheds of treated and untreated radioactive waste G3 and G4 were determined by the technique of passive detection with solid state nuclear track (SSNTD) detectors. The detector used was CR-39 inserted in a diffusion chamber type NRPB. A total of 12 internal points and 1 external point were monitored in the shed radioactive waste treated G4 and 13 points in the shed radioactive waste untreated G3, for a period of 11 months between June 2012 and May 2013. Concentrations ranged 0.73 ± 0.08 to 4.55 ± 0.16 kBq∙m among the monitoring periods in the shed G4 and between 0.61 ± 0.07 and 2.94 ± 0.12 kBq∙m in the shed G3. The effective dose due to inhalation of Rn inside the sheds radioactive waste was calculated according to the procedures of the International Commission on Radiological Protection (ICRP) from a conversion factor of dose, the mean concentration of Rn in the air and time of exposure of individuals. The dose values for G4 and G3 are 15.70 and 9.27 mSv∙a respectively, this being greater than the value established by the National Nuclear Energy Commission (CNEN) and recommended by the International Commission on Radiological Protection (ICRP) 20 mSv / a for occupationally exposed individuals, thus indicating the need for mitigation measures. It should, however, report that was considered a very conservative assumption of 2,000 hours of work on site.

Monitoração de Rn-222 nos galpões de armazenamento de rejeitos radioativos do IPEN