Passive neutron counter for determination of transuranics in high gamma activity samples
A very sensitive neutron counting instrument is described which can determine the presence of small quantities of transuranic materials in samples emitting extremely high levels of gamma radiation and which can determine the isotopic content. The detector is of modular design to facilitate disassembly for maintenance or decontamination as necessary, and consists of radiation shields both internal and external to a neutron counter module. The counter module is an annular array of 80 /sup 10/BF/sub 3/ proportional counting tubes arranged in two concentric rows of 40 tubes which are surrounded by a polyethylene moderator. The electronic circuitry permits measurements to be made in two distinct modes: a coincidence mode for isotopic composition measurements, and a spatial mode for determining the physical distribution of the transuranics within the sample. (LEW)
- Research Organization:
- Pacific Northwest Lab., Richland, WA (USA)
- DOE Contract Number:
- AC06-76RL01830
- OSTI ID:
- 5480893
- Report Number(s):
- PNL-SA-11338; CONF-831015-31; ON: DE84004830
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
COINCIDENCE CIRCUITS
DESIGN
DETECTION
ELECTRONIC CIRCUITS
ELEMENTS
ISOTOPE RATIO
MEASURING INSTRUMENTS
MODERATORS
NEUTRON DETECTION
ORGANIC COMPOUNDS
ORGANIC POLYMERS
POLYETHYLENES
POLYMERS
POLYOLEFINS
PROPORTIONAL COUNTERS
RADIATION DETECTION
RADIATION DETECTORS
SHIELDS
TRANSURANIUM ELEMENTS