Resumo de eventos cient??ficos
Self-attenuation factors in gamma-ray spectrometry of samples containing radionuclides of natural origin
Registro en:
0000-0001-5641-1165
Autor
PECEQUILO, B.R.S.
CAVALCANTE, F.
BARROS, L.F.
FERREIRA, A.O.
FONSECA, L.M.
MATEUS, C.
INTERNATIONAL SYMPOSIUM ON NATURALLY OCCURRING RADIOACTIVE MATERIAL, 8th
Resumen
High resolution gamma-ray spectrometry is currently the most widely used analytical technique for
qualitative and quantitative determination of radionuclides. Quantification of elements relies on the correct
analysis of the spectra, depending strongly on the efficiency calibration of the measurement apparatus, most often
performed with aqueous standard multi-radionuclide solutions. For efficiency calibration curves obtained by this
method and for samples containing radionuclides of natural origin such as sand, soil, rocks and wall paint with
apparent typical densities higher than that of water, self-attenuation correction factors were experimentally
determined for hundreds of different samples using the Cutshall transmission technique. The results show that, to
obtain more reliable analyses, correction factors for the self-attenuation behaviour, especially in the lower part of
the energy spectrum, should be used. Since attenuation depends not only on the density of the sample but also on
its chemical composition, correction factors have to be determined for each sample.