Thermal neutron collimator

Details Thermal neutron collimator Thermal neutron collimator

1983-04-13

1986-04-15

Smith, Alfred E.

Radiant energy

Radiation controlling means

2505181, 378147, G21K 102

Patent

active

045829993

ABSTRACT:
In a system for generating thermal (14 MeV) neutrons containing an ionic accelerator, a novel thermal neutron collimator for producing a beam of collimated thermal neutrons is disclosed. The apparatus includes a substantially hollow collimator tube (10) having a closed, neutron permaeable inlet portion (20) communicating with a source of thermal neutrons (12) and an open outlet portion (22) disposed downstream of the inlet portion at the opposite end of the tube. The collimator walls (14,16,18) diverge outwardly toward the outlet portion of the tube and are formed of three radial layers comprising an outer layer of thermal neutron absorbing material (26) for absorbing off-axis thermal neutrons, an intermediate layer of lead (24) for absorbing X-rays and gamma rays and an inside layer of aluminum (23) for structural support.

REFERENCES:
patent: 3056028 (1962-09-01), Mattingly
patent: 3781564 (1973-12-01), Lundberg
patent: 4192998 (1980-03-01), Azam
patent: 4300054 (1981-11-01), Dance et al.
Meister et al., "Neutron Collimators with Plates of Self-Contracting Foils", Nuc. Instru. and Meth., 108 (1), Apr. 1, 1973, pp. 107-111.
Vasilik et al., "Thermal-Neutron Radiography with a Sealed-Tube Neutron Generator and Water Moderator", Nuc. Tech. 14 (3), Jun. 1972, pp. 279-283.
Vasilik et al., "Neutron Radiography with a Sealed-Tube Neutron Generator and Graphite Moderator System", Materials Evaluation, Jun. 1971, pp. 130-132.
Spowart, "Use of a 10" n/sec Neutron Generator for Neutron Radiography", Nucl. Instru. & Methods, 92 (4), pp. 613-617, 1971.

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