Radio-activation by high-energy proton accelerators and its influence on the environment

This text contains the following subjects. (1) Introduction, (2) The mechanism of the radio-activation at proton accelerator facilities, (3) Radio-activation of accelerator components, (4) Radio-activation of the air in the high-energy proton accelerator tunnel, (5) Radio-activation of the cooling water in high-energy proton accelerators, (6) Radio-activation of the shielding concrete of high-energy proton accelerators, (7) Radio-activation of the under-floor soil and the ground water of high-energy proton accelerator facilities, (8) Radio-activation of the soil and the ground water around the neutrino-decay area, (9) The concentration of the radioactive nuclides in the environmental water of the High Energy Physics Research Organization, and (10) Summary. (K.Y.)