Determination of the absolute intensity of the 1205 keV γ-ray emission from 91Y

Determination of the absolute intensity of the 1205 keV γ-ray emission from 91Y

A radiochemically pure solution of 91Y was produced by the thermal neutron fission of 235U followed by successive chemical separations to remove fission product impurities. The gamma emission rate of the 91Y 1205 keV gamma was measured using multiple high purity germanium gamma spectrometers previou...

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Bibliographic Details
Published in:Applied radiation and isotopes Vol. 205; p. 111172
Main Authors: Gilligan, C.R.D., Stokes, T.C., Goodwin, M.A., John, D., Wroe-Brown, J., Higginson, M., McLarty, J.L.
Format: Journal Article
Language:English
Published: Elsevier Ltd 01-03-2024
Subjects:
Gamma emission intensity
Gamma intensity
Gamma spectrometry
High purity germanium
Liquid scintillation counting
Nuclear data
Radiation measurement
Radiometrology
Y-91
Yttrium-91
Gamma intensity
Liquid scintillation counting
Yttrium-91
Y-91
Gamma emission intensity
High purity germanium
Radiation measurement
Radiometrology
Nuclear data
Gamma spectrometry
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Summary:A radiochemically pure solution of 91Y was produced by the thermal neutron fission of 235U followed by successive chemical separations to remove fission product impurities. The gamma emission rate of the 91Y 1205 keV gamma was measured using multiple high purity germanium gamma spectrometers previously calibrated for counting efficiency using a certificated mixed nuclide gamma standard. The activity concentration of the 91Y was subsequently standardised by liquid scintillation counting. From the combination the activity concentration and gamma emission intensity, the absolute intensity of the 1205 keV gamma emission was derived as 0.2297(39)%. This data agrees within the quoted uncertainties with the absolute intensity of 0.26(4)% published in nuclear data sheets A=91 (Baglin, 2013), but reduces the uncertainty by an order of magnitude. •The emission intensity of the 91Y 1204.8 keV gamma is reported as 0.2297(39)%.•Value is consistent with current evaluation but an order of magnitude more precise.•Derivation achieved using liquid scintillation counting and gamma spectrometry.•Further measurements are recommended to further improve 91Y nuclear data.
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ISSN:0969-8043
1872-9800
DOI:10.1016/j.apradiso.2023.111172