Estimation of Activity and Dose Distributions around a Proton Linac Induced by Beam Spill

In order to estimate if a proton linac with energy of a few GeV is accessible in a few days after continuous operation of a year with the beam spill rate of 1 W/m, Monte Carlo calculations are carried out. The calculations show that the maximum dose equivalent rate caused by the induced radioactivity of the linac is a few hundreds μSv/h at the distance of 30 cm from the surface of the linac after cooling time of a day.