Radiant energy – Invisible radiant energy responsive electric signalling – With or including a luminophor
Patent
1991-08-30
1992-10-13
Fields, Carolyn E.
Radiant energy
Invisible radiant energy responsive electric signalling
With or including a luminophor
250366, 250367, 25039007, 25039008, 25039011, G01N 120, G01N 306
Patent
active
051553660
ABSTRACT:
Apparatus and method for detecting a particular type of particle in an energy range of interest are provided. The apparatus includes two photomultipliers (24, 26) which are spaced apart in facing relation to one another. A scintillator (22) is positioned between the photomultipliers (24, 26). The scintillator (22) comprises an array of optical fibers, preferably light pipes (40), arranged substantially contiguously side-by-side. Each of the light pipes (40) has a first end proximate the first photomultiplier (24) and an opposing second end proximate the second photomultiplier (26). Each light pipe (40) has one of its ends being non-transmissive of light. The light pipes are arranged so that contiguous ones of the light pipes (40) do not have their same ends being non-transmissive of light. Each of the light pipes (40) in the array have a cross sectional dimension thereof chosen in relation to a distance that the particular type of particle in the energy range of interest can travel. A signal processor unit (28) uses signals from the photomultipliers (24, 26) to determine when a particular type of particle in the energy range of interest is detected. The signal processor unit (28) discriminates between different types of particles and rays by determining the number of light pipes (40) affected within a predetermined time interval by an incoming particle or ray.
REFERENCES:
patent: 4180736 (1979-12-01), Goodman
patent: 4829185 (1989-05-01), Cerff
Thomas G. Miller, Welman Gebhart, Lee Hilbert, and George Edlin, "Fiber Optics Neutron Detectors", Worshop on Scintillating Fiber Detector Development for the SSC, Nov. 14-16, 1988.
P. Sperr, H. Spieler and M. R. Maier, "A Simple Pulse Shape Discrimination Circuit", Nuc. Instr. and Meth., 116 (1974), pp. 55-59.
Miller, Thomas G., "Measurement of Pulse Shape Discrimination Parameters for Several Scintillators", Nuc. Instr and Meth., 63 (1968), pp. 121-122.
Fields Carolyn E.
General Research Corporation
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