Estimated neutron-activation data for TFTR

A systematic study has been initiated to address the overall neutron activation problem for the TFTR operation. The study consists of a sequence of investigation and calculation on (1) the specific activity for the elements; (2) the activation dose rate from isolated sample materials; (3) the global activation dose rate field; and (4) the streaming of delayed gamma-rays through penetrations during post-operational period. This report summarizes the important data essential to the first part of this sequence. A formula for calculating the specific activity for a pulsed machine is presented in an explicit form. Effective activation cross sections are tabulated using ten neutron flux distributions typical to the TFTR radiation environment. The specific activities and the delayed gamma-ray intensities for about forty naturally occurring elements are presented for the 5 days per run, 50 pulses per day operation at the TFTR vacuum vessel location. A list of specific activities for the same set of elements five years after a thousand typical TFTR pulses is also given.