Measurement of absolute γ-ray emission probabilities in the decay of 227Ac in equilibrium with its progeny

The emission probabilities of γ-rays produced in the 227Ac decay series were determined by high-resolution γ-ray spectrometry of sources with standardised activity. The sources were prepared quantitatively on glass disks by drop deposition of a solution with 227Ac in radioactive equilibrium with its daughter nuclides. Their activity was measured by a primary standardisation technique based on alpha-particle counting at a defined low solid angle. Four laboratories performed γ-ray spectrometry and derived absolute γ-ray intensities. Mean values were calculated and compared with literature data and the currently recommended evaluated data. New values on certain γ-emission probabilities are proposed.

MAROULI Maria;  LUTTER Guillaume;  POMME Stefaan;  VAN AMMEL Raf;  HULT Mikael;  PIERRE S.;  DRYAK P.;  CARCONI P.;  FAZIO A.;  BRUCHERTSEIFER Frank;  MORGENSTERN Alfred; 

2018-12-17

PERGAMON-ELSEVIER SCIENCE LTD

JRC111568

0969-8043 (online),   

https://publications.jrc.ec.europa.eu/repository/handle/JRC111568,   

10.1016/j.apradiso.2018.08.023 (online),