Radiant energy – Invisible radiant energy responsive electric signalling – With means to inspect passive solid objects
Patent
1979-04-09
1981-07-07
Smith, Alfred E.
Radiant energy
Invisible radiant energy responsive electric signalling
With means to inspect passive solid objects
250390, 250497, G01N 2300, G21F 502
Patent
active
042776805
ABSTRACT:
A neutron poison test device for verifying that high density spent nuclear fuel racks contain neutron poison (a substance that absorbs neutrons without inducing a nuclear fission which produces more neutrons) comprises a can having a square cross-section, which contains a fast neutron source and neutron moderator, and four square cans each containing a thermal neutron detector, one detector can positioned opposite each of the four walls of the source can. The five cans are carried at the lower ends of five elongated tubes, which are connected together at the top by a structure having means for receiving the lifting hook of a hoist or crane. A neutron shield having a hollow square cross-section is supported for sliding movement on the center tube and is adapted to envelop the source can when the test device is outside the high density storage rack. Each of the four walls of the sliding shield contains a Boral plate or other thermal neutron absorber plate. The interior of the source can is filled with a moderating material (paraffin or water) which slows or thermalizes the neutrons. The can is partitioned to permit certain zones and layers of the moderator to be mixed with neutron absorber, thus providing shielding in desired directions, but permitting an unshielded flow of neutrons toward the detectors. Shielding prevents unnecessary radiation doses to workers using the device.
REFERENCES:
patent: 3872310 (1975-03-01), Charlton et al.
patent: 3958120 (1976-05-01), Ward
patent: 4038550 (1977-07-01), Wassen et al.
patent: 4081086 (1978-03-01), Shallenberger
Crawford Thomas J.
Rodriguez Luis F.
Fields Carolyn E.
Smith Alfred E.
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