AMS analysis of 36Cl induced in shielding concrete of various accelerator facilities

At the accelerator facilities, shielding concrete of beam lines are exposed to secondary particles during machine operation, and various long-lived radionuclides are accumulated in shielding concrete of beam lines. Quantitative evaluation of radionuclides induced in the shielding concrete is important for radioactive waste management in reconstruction or decommissioning of accelerator facilities. The γ-ray emitting radionuclides, such as 22Na, 54Mn, 60Co, 152Eu and 154Eu, can be easily measured by Ge detectors, and 3H can be measured by liquid scintillation counters. On the other hand, low concentration of 36Cl in concrete samples can be measured only by accelerator mass spectrometry (AMS). (orig.)