Published August 15, 1982
| public
Journal Article
Thorium-uranium fission radiography II
- Creators
- Murrell, M. T.
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Burnett, D. S.
Abstract
The high energy secondary neutron flux produced by 500–650 MeV protons at the beam stop of the Los Alamos Meson Physics Facility (LAMPF) is evaluated for use in measuring the micro distribution of thorium in geologic materials, e.g. in individual mineral grains, ≳50 µm in size. The relative Th/U fission rate is found to be 0.5 with a Th track production rate of 1.2×10^4 tracks/cm^2•ppm•mAh. The background of long interaction tracks (⩽10 μm) limits the sensitivity of this method to samples of 3–5 ppm Th. We find a similar background of long interaction tracks in a LAMPF proton irradiation.
Additional Information
© 1982 North-Holland Publishing Company. Received 7 July 1981 and in revised form 4 January 1982. We are grateful for the excellent cooperation of the LASL LAMPF staff, in particular B. Dropesky and L. Ulibari. We thank W.R. Heuser for experimental assistance and Lou Ann Cordell for typing this paper. This research was supported by NSF grants EAR79-20091 and PHY79-23638.Additional details
- Eprint ID
- 56939
- Resolver ID
- CaltechAUTHORS:20150424-083121620
- EAR79-20091A-1
- NSF
- PHY79-23638
- NSF
- Created
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2015-04-24Created from EPrint's datestamp field
- Updated
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2021-11-10Created from EPrint's last_modified field
- Caltech groups
- Division of Geological and Planetary Sciences