INDUCED RADIOACTIVITY OF THICK COPPER AND LEAD TARGETS IRRADIATED BY PROTONS, ~4HE AND ~(12)C NUCLEI WITH ENERGY 3.65 GEV/NUCLEON

摘要

The induced γ-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 ≥1 GeVucleon, 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_A(t) of a dose caused by the induced radioactivity of a thick target, from the dose rate d_P(t) of protons with the same ratio of energy on nucleon.