Nuclear cargo detector

Details Nuclear cargo detector Nuclear cargo detector

2006-12-19

2006-12-19

Gabor, Otilia (Department: 2884)

Radiant energy

Invisible radiant energy responsive electric signalling

Including a radiant energy responsive gas discharge device

C250S374000, C250S336100, C340S600000, C340S500000

Reexamination Certificate

active

07151266

ABSTRACT:
Apparatus for the inspection of cargo containers for nuclear materials comprising one or more arrays of modules comprising grounded, closed conductive tubes filled with an ionizing gas mixture such as, but not limited to, Argon:CO2. A wire is suspended along each tube axis and electrically connected at both ends of the tube. A positive, dc high voltage is supplied to one end of the wire and an amplifier is attached to the other end through a capacitance to decouple the amplifier from the high voltage. X-rays, gamma rays or neutrons produced by nuclear material and passing through the tube ionize the gas. The electrons from the gas ionization process are accelerated toward the wire surface due to the wire's electrical potential. The acceleration of the electrons near the wire's surface is sufficient to ionize more gas and produce an amplification of electrons/ions that create a surge of current large enough to be detectable by the amplifier. Means are also provided for a warning device coupled to the amplifier.

REFERENCES:
patent: 4320418 (1982-03-01), Pavliscak
patent: 4956557 (1990-09-01), Vlasbloem
patent: 5002720 (1991-03-01), Berggren
patent: 6845873 (2005-01-01), Chattey
patent: 2003/0201394 (2003-10-01), Peoples

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