Calculations of the chemical composition modifications and activity induced by spallation residues in thick Pb or Pb-Bi targets, after 1 year of irradiation by 1 GeV protons, have been performed with LAHET3, in which the new INCL4-ABLA model has been implemented. Since this model has been shown to fairly reproduce recent measurements of the isotopic distributions of spallation residues produced in Pb by 1 GeV protons (performed with the reverse kinematics technique) and evolution with energy of the production of radioactive isotopes (measured by ƒ×-spectrometry), it is now possible to rely on the prediction of the calculation and assess the uncertainties on the predictions. It is found that for activity estimations, the use of the new models instead of standard ones (as the Bertini-Dresner combination) changes only little the prediction. However, for chemical impurities up to a factor 3 discrepancies can be found with the new model, in particular in the case of some volatile elements, due to a bad prediction of the fission fragment yields in the standard codes. |
