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7 Be is a key radionuclide for investigation of several astrophysical processes and phenomena. In addition, it is used as a tracer in wear measurements. It is produced in considerable amounts in the cooling water (D 2 O) of the Spallation Induced Neutron Source (SINQ) facility at PSI by spallation reactions on  16 O with the generated fast neutrons. A shielded ion-exchange filter containing 100 mL of the mixed-bed ion exchanger LEWATIT was installed as a bypass for the cooling water into the cooling loop of SINQ for three months. The collected activity of  7 Be was in the range of several hundred GBq. Further, the  7 Be was separated and purified in a hot-cell remotely-controlled using a separation system installed. With the exception of  10 Be, radioactive byproducts can be neglected, so that this cooling water could serve as an ideal source for highly active  7 Be-samples. The facility is capable of producing  7 Be with activities up to 1 TBq per year. The  7 Be sample preparation is described in detail and the possible uses are discussed. In particular some preliminary results of  7 Be ion beam production are presented.

Radiochemical separation of 7 Be from the cooling water of the neutron spallation source SINQ at PSI