Radiant energy – Invisible radiant energy responsive electric signalling – Neutron responsive means
Patent
1984-01-20
1986-07-08
Howell, Janice A.
Radiant energy
Invisible radiant energy responsive electric signalling
Neutron responsive means
2505181, G01T 300
Patent
active
045995150
ABSTRACT:
A moderator and beam port assembly is designed particularly for use with an accelerator source of fast neutrons to provide a collimated beam of thermal neutrons directed toward an object position for neutron radiography. A central moderator of solid hydrogenous material, preferably high density polyethlene, having a high hydrogen density and substantially no neutron poisons, has a source cavity lying on the beam axis for supporting the source of fast neutrons adjacent the axis. To form a beam of thermal neutrons, a ring of neutron poison material is disposed outside the moderator to form an aperture symmetrically disposed about the axis. The moderator has an inner beam port cavity extending substantially symmetrically of the axis from the aperture substantially to the source cavity. A heavy metal shield just outside the poison ring stops gamma rays produced upon capture of neutrons by the moderator and ring material. The shielding has a diverging opening mating the aperture with the entrance to a divergent beam collimator symmetrically disposed about the axis. The collimator is formed of heavy metal and neutron poison. The assembly is housed in a container substantially filled with an hydrogenous neutron reflector. The assembly may provide more than one neutron beam at the same time with the same or different gamma ray content.
REFERENCES:
patent: 3715597 (1973-02-01), Hofmann et al.
patent: 3733490 (1973-05-01), Roche
patent: 3836785 (1974-09-01), Reifenschweiler
patent: 3846636 (1974-11-01), Zehr et al.
patent: 3914612 (1975-10-01), Cason, Jr. et al.
patent: 3925676 (1975-12-01), Bigham et al.
patent: 4192998 (1980-03-01), Azam
patent: 4266132 (1981-05-01), Marshall, III
Wilson, Lester E., et al., "Neutron Radiography with a 2.5 MeV Van de Graaf Accelerator," High Voltage Engineering Corporation, Feb. 15, 1970.
High Voltage Engineering, Now NR, Neutroflux-NR-Systems for Neutron Radiography, May, 1970.
Stokes, J., et al., "A New Accelerator-Based Neutron Radiography System", IRT 4611-019, IRT Corporation, Dec. 9, 1981.
GA Technologies Inc.
Howell Janice A.
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