Abstract
Production of115Cd by means of photonuclear reaction and preparation of a115mIn generator, based on the genetic sequence of115Cd115mIn, were studied. The production rates of115Cd by the116Cd(γ, n)115Cd reaction were determined as a function of the maximum bremsstrahlung energies between 35 and 60 MeV. Then the parent,115Cd, was produced by irradiating about 0.15g of CdO with the bremsstrahlung from a 60 MeV-150 μA electron beam. After the parent in the Cd42− form was adsorbed on the Dowex 1x8 resin column, the daughter was eluted with a physiologic saline adjusted to pH 1. The generator was milked over a period of 3 days, during which time about 900 ml of eluent were allowed to flow through the column. Even after the milkings were repeated 15 times with 60 ml of the eluent, no115Cd was found in the115mIn fractions (the detection limit of inactive cadmium: 0.02 μg).
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