Apparatus for measuring the concentrations of elements in a material by the capture gamma method

Patent · Tue Jul 14 00:00:00 EDT 1981

OSTI ID:6023725

Lukander, T A; Rautala, P; Sipila, H J; Uusitalo, S J

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
• Resource Relation: Patent Priority Date: Priority date 4 May 1978, Finland
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ACTIVATION ANALYSIS
NEUTRON ACTIVATION ANALYZERS
DESIGN
BISMUTH
CAPTURE
CONES
GAMMA RADIATION
GRAPHITE
HEAVY WATER
MEASURING METHODS
NEUTRON SOURCES
SEMICONDUCTOR DETECTORS
CARBON
CHEMICAL ANALYSIS
ELECTROMAGNETIC RADIATION
ELEMENTS
HYDROGEN COMPOUNDS
IONIZING RADIATIONS
MEASURING INSTRUMENTS
METALS
NONMETALS
OXYGEN COMPOUNDS
PARTICLE SOURCES
RADIATION DETECTORS
RADIATION SOURCES
RADIATIONS
WATER
400101* - Activation
Nuclear Reaction
Radiometric & Radiochemical Procedures
440105 - Radiation Instrumentation- Radiometric Instruments- (-1987)