Induced radioactivity of thick copper and lead targets irradiated by protons, /sup 4/He and /sup 12/C nuclei with energy 3.65 GeV/nucleon

The induced /spl gamma/-radioactivity brings the main contribution to the exposure dose for the personnel of a high-energy accelerator. At the machines accelerating the heavy particles to the energies of /spl ges/1 GeV/nucleon, this contribution amounts up to 50% of the dose. The present study deals with the levels of induced radioactivity in dependence on the target material, sort of particles being accelerated, and time t elapsed since the end of irradiation. Recommendations are given to evaluate the rate per an incident nucleus d/sub A/(t) of a dose caused by the induced radioactivity of a thick target, from the dose rate d/sub P/(t) of protons with the same ratio of energy on nucleon.