Measurement of the absolute gamma-ray emission intensities from the decay of 147Nd

M A Kellett; L Vio; C Bobin; L Brondeau; M Cardot-Martin; H Isnard; D Lacour; M-C Lépy; V Lourenço; M Marie; C Thiam

doi:10.1016/j.apradiso.2020.109349

Measurement of the absolute gamma-ray emission intensities from the decay of ¹⁴⁷Nd

Appl Radiat Isot. 2020 Dec:166:109349. doi: 10.1016/j.apradiso.2020.109349. Epub 2020 Jul 29.

Authors

M A Kellett¹, L Vio², C Bobin³, L Brondeau³, M Cardot-Martin³, H Isnard², D Lacour³, M-C Lépy³, V Lourenço³, M Marie², C Thiam³

Affiliations

¹ CEA, LIST, Laboratoire National Henri Becquerel (LNE-LNHB), Bât. 602 PC111, CEA-Saclay, 91191, Gif-sur-Yvette Cedex, France. Electronic address: mark.kellett@cea.fr.
² CEA, DEN, Laboratoire de développement Analytique Nucléaire Isotopique et Elémentaire (LANIE), Bât. 391 PC33, CEA-Saclay, 91191, Gif-sur-Yvette Cedex, France.
³ CEA, LIST, Laboratoire National Henri Becquerel (LNE-LNHB), Bât. 602 PC111, CEA-Saclay, 91191, Gif-sur-Yvette Cedex, France.

PMID: 32818806
DOI: 10.1016/j.apradiso.2020.109349

Abstract

The 2011 Decay Data Evaluation Project (DDEP) evaluation for ¹⁴⁷Nd includes recommended absolute emission intensities for the two main gamma-rays at 91.105 (2) keV and 531.016 (22) keV of 0.284 (18) and 0.127 (9) respectively, i.e. with uncertainties of 6.3% and 7.1%. These large uncertainties stem from inconsistencies in the published data and are unfit for modern purposes, since the production of ¹⁴⁷Nd is used as an important neutron flux dosimeter. The LNE-LNHB has undertaken new absolute gamma-ray emission intensity measurements. The results of these measurements will be presented, along with a full uncertainty budget, and their effect on the recommended data uncertainties will be discussed.

Keywords: 4πβ–γ coincidence; 4πγ counting; HPGe detector; Nd-147; Radionuclide metrology; absolute gamma ray emission intensities.