Radiant energy – Invisible radiant energy responsive electric signalling – With or including a luminophor
Patent
1988-03-11
1989-11-14
Hannaher, Constantine
Radiant energy
Invisible radiant energy responsive electric signalling
With or including a luminophor
250361R, 25037001, G01T 117
Patent
active
048809810
ABSTRACT:
A plastic scintillator element that is tissue equivalent is optically coupled to a photomultiplier tube that provides a pulse signal which contains information relating to radiation energy fluence, and having an undesirable "dark current" component. A direct current blocking element in the form of a capacitor isolates the input of an operational amplifier from the "dark current" component so that the output signal of the amplifier indicates the average current of the photomultiplier signal attributed only to detected, low level, environmental radiation in the range of 0-200 .mu.rem/h.
REFERENCES:
patent: 4617680 (1986-10-01), Johnston
Susumu Minato, "A New Method for Measurement of .gamma. Ray Flux with NaI-(Tl) Scintillation Counter and Its Application to Environmental .gamma. Radiation Analysis". Rep. Gov. Ind. Res. Inst. Nagoya(Japan) vol. 25, No. 11, (Nov. 1976), pp. 334-338.
Bicron Corporation
Hannaher Constantine
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