X-ray or gamma ray systems or devices – Source
Patent
1992-12-10
1993-12-28
Church, Craig E.
X-ray or gamma ray systems or devices
Source
378210, H01J 3500
Patent
active
052746895
ABSTRACT:
A source of gamma rays (a photon beam) at a single energy produced by the single-quantum annihilation of accelerated positrons with electrons of a target element. The photons are emitted predominantly in the forward direction and are accompanied by background radiation which can be differentially suppressed. The energy of the photons is determined by varying the energy of incident positrons. The photon beam is usable in materials research and analysis, medical diagnosis and therapy, and numerous other fields.
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Lindenstruth et al.; Measurements and simulations of low enery, thick target bremsstrahlung spectra; Nuc. Instr. Meth. Physics Res. A300:293-296 (1991).
Palathingal et al.; Single-quantum annihilation of positrons with shell-bound atomic electrons; Physical Rev. Letters 67:3491-3494 (1991).
Asoka-Kumar Palakkal
Lynn Kelvin G.
Palathingal Jose C.
Brookhaven National Laboratory
Church Craig E.
University of Puerto Rico
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