The presence of large quantities of32P in neutron activated biological specimens is often a limiting factor in the direct application of γ-ray spectroscopy. A
technique for the selective removal of phosphates in neutron activated specimens is described. The technique is based on the
adsorption of phosphates on chromatographic grade alumina. The adsorption selectivity was studied by determining the behaviour
of 49 ions when submitted to the procedure for phosphate removal. A few applications are reported as examples.