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For estimation of the activity of the long-lived   41 Ca isotope in seven concrete samples exposed to a varying neutron flux,   45 Ca activities in the samples were determined. Instead of total dissolution the concrete samples were treated with 8 M HCl and HNO 3  for partial dissolution of calcium. From the leachate, stable calcium was determined by AAS and   45 Ca activity with LSC after radiochemical separation while the total stable calcium in the concrete samples was determined by XRF. Calcium was separated from the leachates using cycles of precipitation and ion exchange. In addition to   45 Ca, seventeen γ-emitting radionuclides were detected directly in the concrete samples by γ-spectrometry. Ratios of   45 Ca activity concentrations to those of γ-emitting nuclides in the concrete samples with varying dose were more or less identical. Determination of   63 Ni activity in the concrete samples failed because activity levels were below the detection limit.

Determination of 45 Ca and γ-emitting radionuclides in concrete from a nuclear power plant