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Two-channel high-pressure helium-3 scintillation neutron detector

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5 Author(s)
Arodzero, A. ; Constellation Technol. Corp., Largo, FL, USA ; Bolozdynya, A. ; Bolotnikov, A. ; Proctor, A.
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We have developed a two-channel, high-pressure 3He gas scintillation detector that operates in coincidence mode. The detector consists of two 16-mm diameter avalanche photodiodes viewing a 7-mm gap between them and mounted inside a stainless steel shell with 1.5-mm thick input windows. The gap is filled with a 3He+0.5%Xe gas mixture pressurized at 35 bar. The detector rejects signals generated by radiation interacting directly with the photodiodes and works as a "wall-less" detector, sensitive to interactions occurring only in the gas. The detector demonstrates axial and radial position sensitivity to thermal neutrons within the gap between photodiodes. The position sensitivity is observed in good agreement with computer simulations. Applications are discussed.

Published in:

Nuclear Science Symposium Conference Record, 2003 IEEE  (Volume:1 )

Date of Conference:

19-25 Oct. 2003

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