Preliminary activation calculations for the poloidal divertor experiment

The poloidal divertor experiment (PDX) Tokamak is being operated to study plasma cross section shaping, high power neutral beam heating, and divertor control of plasma impurities in Tokamaks. Experiments to date were performed at relatively low power, but with 6 MW of neutral beam power eventually available, high D-D plasma reaction rates are expected that will yield up to 10 to the 15th power 2.45-MeV neutrons per pulse. This neutron emission level is high enough to cause significant neutron-induced machine activation that must limit the occupancy time of personnel entering the room to repair or change parts. The dose rate depends on the location in the room and, of course, the pulsing history prior to entry. One dimensional activation calculations are described that were done for PDX to provide preliminary dose rate information for various times after shutdown following one week of high power operation.