Position-sensitive neutral particle sensor

Details Position-sensitive neutral particle sensor Position-sensitive neutral particle sensor

1978-06-14

1982-03-16

Smith, Alfred E.

Radiant energy

Invisible radiant energy responsive electric signalling

Including a radiant energy responsive gas discharge device

250385, G01T 118

Patent

active

043202993

ABSTRACT:
In a method of sensing the position of a neutral particle, the particle is received in one of two spaced parallel cathode arrays, each of which comprises a plurality of metal strips arranged adjacent and edge to edge, the strips in one array being orthogonal to the strips of the other array, and the metal of which the strips are formed being such that a neutral particle is converted to a fast electron which escapes from the cathode. Between the two cathode arrays is an anode array consisting of parallel wires held at a known electrical potential and surrounded by a gas. The fast electron is converted to an avalanche of electrons and positive ions; the presence of the ions induces an electrical charge in at least one strip of each cathode array; and the presence of the charges is sensed to determine an orthogonal position.

REFERENCES:
patent: 3891851 (1975-06-01), Fletcher et al.
patent: 4075491 (1978-02-01), Boyd
Medical Images: Formation, Perception and Measurement, edited by Geo. A. Hay, "Multiwire Proportional Chambers" by D. H. Reading, pp. 39-49 (John Wiley & Sons).
Nuclear Instruments and Methods, vol. 124, pp. 491-503, (1975) (The High-Density Multiwire Drift Chamber).
Nuclear Instruments and Methods, vol. 117, pp. 599-603 (1974) (Investigations on Metal Converters for Gamma-Ray Detection and Mapping).
IEEE Transactions on Nuclear Science, vol. NS-23, pp. 640-644 (1976) (The Proportional Chamber Gamma Camera).

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