A worker at a nuclear power station is found to have a body burden of 83 microcuries of Cs-137 during a routine quarterly whole body count. His count in the preceding period was at background. Calculate the CEDE associated with this situation, assuming he inhaled the material. The 30, 60 and 90 day total body IRFs for inhalation (from NUREG/CR-4884) are 0.476, 0.394 and 0.325 respectively.