Apparatus for measuring the concentrations of elements in a material by the capture gamma method
The invention provides an apparatus for measuring the concentrations of elements in a material sample by the capture gamma method. The apparatus includes a neutron source in the form of an isotope source or a neutron generator, a moderator surrounding the neutron source and being at least partly constituted by heavy water, a semiconductor detector serving as gamma radiation detector and positioned in the immediate vicinity of the material to be analyzed and in the flux of slow neutrons. So much of the moderator being provided before the detector that this is reached only by a very low number of fast neutrons that have a damaging effect upon the detector. The material itself can form part of the moderator and also graphite is preferably used as a moderator around said heavy water. Furthermore, a body of bismuth having the shape of a cone or a double cone is preferably positioned in front of the neutron source so as to absorb gamma radiation and to scatter fast neutrons.
- Assignee:
- Outokumpu Oy (Finland)
- Patent Number(s):
- US 4278885
- OSTI ID:
- 6023725
- Country of Publication:
- United States
- Language:
- English
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46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ACTIVATION ANALYSIS
BISMUTH
CAPTURE
CARBON
CHEMICAL ANALYSIS
CONES
DESIGN
ELECTROMAGNETIC RADIATION
ELEMENTS
GAMMA RADIATION
GRAPHITE
HEAVY WATER
HYDROGEN COMPOUNDS
IONIZING RADIATIONS
MEASURING INSTRUMENTS
MEASURING METHODS
METALS
NEUTRON ACTIVATION ANALYZERS
NEUTRON SOURCES
NONMETALS
OXYGEN COMPOUNDS
PARTICLE SOURCES
RADIATION DETECTORS
RADIATION SOURCES
RADIATIONS
SEMICONDUCTOR DETECTORS
WATER