Abstract
A method is presented to obtain efficiency calibration for samples of unknown composition in gamma spectrometry. It is based on photon transmission measurements using 155Eu, a multi-energetic gamma emitter. An iterative algorithm produces a virtual chemical composition reproducing the measured sample self-absorption in the range 43–146 keV. The composition is then used to numerically create a sample-specific efficiency calibration. The procedure was tested with IAEA certified sediment materials containing 210Pb, 241Am, 155Eu, and 226Ra. The deviation from certified values ranged between 3 and 22%, within the range of experimental uncertainty (between 5 and 35%, due to low isotope concentrations).
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