Determination of the gamma emission intensities of 111Ag

• Published in: Applied radiation and isotopes Vol. 87; pp. 107 - 111
• Main Authors: Collins, Sean, Keightley, John, Gilligan, Chris, Gasparro, Joel, Pearce, Andy
• Format: Journal Article
• Language: English
• Published: England Elsevier Ltd 01-05-2014
• Subjects: Ag-111; Gamma emission intensities; Radioactivity; Spectroscopy; Ag-111; Spectroscopy; Gamma emission intensities; Radioactivity
• ISSN: 0969-8043; 1872-9800
• DOI: 10.1016/j.apradiso.2013.11.007

A radioactive solution of 111Ag, standardised by the absolute measurement methods 4π(PC)-γ and 4π(LS)-γ coincidence counting at the National Physical Laboratory (NPL), was measured by two independently calibrated HPGe γ spectrometers in order to estimate the γ emission intensities and to determine the absolute intensity, with the aim of improving the currently published values. An absolute intensity value of 6.68 (7)% was obtained for the 342.1keV γ emission, which is in agreement with previously reported values, but greatly reduces the uncertainty. Additionally, this work proposes a new emission intensity for the 450.0keV γ emission that has not been previously reported, with an absolute intensity of 0.000482 (12)%. An investigation of the published γ emission intensities shows significant discrepancies that require resolution.
•Gamma emission probabilities of 111Ag determined.•Absolute intensity of 342.1keV of 111Ag determined.•Gamma emission of 450.0keV confirmed and measured.•Significant discrepancies in published gamma emission probabilities outlined.