Authors:
A. Simonits Central Research Institute for Physics (KFKI) P. O. Box 49 H-1525 Budapest 114 (Hungary)

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L. Moens Institute for Nuclear Sciences (INW), Rijksuniversiteit Proeftuinstraat 86 9000 Gent (Belgium)

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F. De Corte Institute for Nuclear Sciences (INW), Rijksuniversiteit Proeftuinstraat 86 9000 Gent (Belgium)

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A. De Wispelaere Institute for Nuclear Sciences (INW), Rijksuniversiteit Proeftuinstraat 86 9000 Gent (Belgium)

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J. Hoste Institute for Nuclear Sciences (INW), Rijksuniversiteit Proeftuinstraat 86 9000 Gent (Belgium)

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Abstract  

The induced activity of the99Mo isotope is mostly determined via the 140.5 keV γ-line, which is the strongest gamma-ray of its daughter,99mTc. Some recent literature, however, indicates a direct feeding of this energy level from the mother isotope as well. Considering the importance of this line in practice as well as the large controversy and scattering in relevant nuclear data available at present, a combined effort was made to remeasure this questionable absolute intensity. A relative method of irradiating a Mo-target with reactor neutrons and repeatedly measuring its (n,γ) induced activity relative to the 181.1 keV and 739.5 keV gamma lines of99Mo as internal references was used. The weighted average of different runs yielded γ(99Mo, 140.5 keV)=(5.07±0.37)%. As a consequence, when the 140.5 keV gamma line is used, the contribution from the99Mo mother isotope should always be taken into account, e.g. in neutron cross-section measurements and neutron activation analysis.

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Journal of Radionalytical and Nuclear Chemistry
Language English
Size A4
Year of
Foundation
1968
Volumes
per Year
1
Issues
per Year
12
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 0236-5731 (Print)
ISSN 1588-2780 (Online)