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For the decommissioning and disposal of shielding concrete from accelerator facilities, the Swiss Authorities require information on the radionuclide inventory. Besides the easy-to-measure  γ -emitters  152 Eu,  60 Co,  44 Sc,  133 Ba,  154 Eu,  134 Cs,  144 Ce,  22 Na, also long-lived radionuclides emitting  α - or  β -radiation like  129 I,  10 Be,  36 Cl,  239/240 Pu and  238 U have to be studied in order to obtain an overview to which extent they are produced and whether they represent a safety issue. In this study, we present the chemical separation and determination of selected radionuclides in shielding concrete from two different positions in the accelerator facilities at the Paul Scherrer Institute (PSI), the BX2 station, which was shut down in 1998, and the environment of the target M station, where the samples were taken in 1985 during reconstruction. The results of the measurements show that in no case the radionuclide content represents a safety risk. The components can be decommissioned corresponding to the Swiss safety regulations.

Radiochemical analysis of concrete samples from accelerator waste