High resolution directional gamma ray detector

Details High resolution directional gamma ray detector High resolution directional gamma ray detector

1989-08-16

1990-09-04

Hannaher, Constantine

Radiant energy

Invisible radiant energy responsive electric signalling

Including a radiant energy responsive gas discharge device

250374, 250389, 250394, G01T 129, G01T 700

Patent

active

049547097

ABSTRACT:
A high resolution directional gamma ray detector includes a thin piece of foil, such as tantalum, which reacts with gamma rays incident to the edge of the foil to generate electron/positron pairs. Gamma rays originating from directions other than a direction of interest are shielded from the foil by shielding plates. An opening between the foil by shielding plates. An opening between two collimating plates permits passage of gamma rays originating from a direction of interest and allows gamma rays originating from a direction of interest to react with the foil. The generated electron and positron cause ionization in a plurality of cells. Signals resulting from these ionizations are processed by an electronic computation system through the use of coincidence processing to determine whether the signals are the result of a reaction between the foil and a gamma ray which passed through the collimator opening.

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patent: 4259575 (1981-03-01), LeVert et al.
patent: 4447727 (1984-05-01), Friesenhahn
patent: 4638499 (1987-01-01), Eberhard et al.
patent: 4804848 (1989-02-01), Horiba et al.

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