On energy absorption effects in uranium and thorium thin films

The use of U and Th thin films, attached to detectors of fission tracks, allows determining the neutron fluence in nuclear reactors. In principle, the parameters involved in neutron fluence determinations through U and Th thin films that might be influenced by effects related with fission fragments...

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Bibliographic Details
Published in:Radiation measurements 2008-08, Vol.43, p.S334-S336
Main Authors: Hadler, J.C., Iunes, P.J., Bigazzi, G., Paulo, S.R.
Format: Article
Language:English
Subjects:
Earth sciences
Earth, ocean, space
Exact sciences and technology
Fission-track dating
Geochronology
Isotope geochemistry. Geochronology
Neutron fluence
Thin film
Thorium
Uranium
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Summary:The use of U and Th thin films, attached to detectors of fission tracks, allows determining the neutron fluence in nuclear reactors. In principle, the parameters involved in neutron fluence determinations through U and Th thin films that might be influenced by effects related with fission fragments and α particle energy absorption are: (i) the detection efficiency of nuclear emulsions for α particles, (ii) the detection efficiency of muscovite mica for fission fragments from thin films, ε F and (iii) the detection efficiency of nuclear emulsions for fission fragments, used to estimate ε F . Fission fragments are more ionizing than α particles and are more influenced by energy absorption. We show that fission fragment energy absorption effects are negligible in case of U and Th thin films employed in neutron fluence determinations for fission-track (FT) dating.
ISSN:1350-4487
1879-0925
DOI:10.1016/j.radmeas.2008.04.047