VALIDATION OF ACTIVATION CALCULATIONS WITH MCNPX WITH SAMPLES FROM A COPPER BEAMDUMP

摘要

All particles that are accelerated in an acceleratorrnfacility are lost somewhere. Some of those loss points arernintentionally designed, such as collimators, slits, beamrndumps and targets. The particles will interact withrnsurrounding matter, initiate particle cascades and therebyrnactivate the materials in the environment of the lossrnpoints. The biomedical area (BMA) beam dump is such arnloss point which was irradiated for 12 years with 590rnMeV protons in the so called biomedical area at PSI.rnAfter dismantling the copper beam dump was cut intornpieces. Samples from the beam dump were taken atrndifferent depths and radial positions. Severalrnradionuclides of interest for a final repository as well asrnnuclides relevant for gamma dose considerations such as 60 Co, 44 Ti, 36 Cl, 53 Mn, 55 Fe, 63 Ni, 26 Al and 108m Ag havernbeen investigated. In this paper we will present arncomparison of calculated and measured nuclide contentsrnof the BMA beam dump.