Release and yields from thorium and uranium targets irradiated with a pulsed proton beam

Radioactive ion-beams produced from various uranium and thorium targets at the ISOLDE mass separator facility are presented. The targets are bombarded with 1 GeV protons delivered by the PS-Booster at CERN. The target materials are uranium carbide and thorium carbide, both prepared from the oxides or diphtalocyanines of uranium and thorium. Due to the pulsed structure of the PS-Booster, release can be measured as a function of time for a number of elements. Beam intensities and delay time distributions of the alkali-metals, the earth-alkalis, the boron group and the noble gases measured from the described targets are discussed, Comparisons are made between the target materials and with ISOLDE beam intensities produced by 600 MeV protons from the CERN synchrocyclotron.