Colloid Rates of Radionuclides in Cooling Water of the 120-GeV Proton Accelerator Facilities at Fermilab, U.S.A.

摘要

Water samples were collected from five cooling water systems for the NuMI beamline and from three cooling water systems for the antiproton production target station immediately after the shutdown of the accelerators for maintenance. Then, the colloid formation rates of the radionuclides were measured by ultrafiltration and γ-ray spectrometry. The colloid formation rates of the radionuclides in cooling water systems with a deionizer were higher than in those without a deionizer. This indicated that the incomplete removal of the radionuclides is caused by the weak retention of the colloids on the ion-exchange resin. In particular, the remaining ~7Be was due to the weak retention of positively charged colloids on cation-exchange resins in the deionizer.