The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 09, 1986
Filed:
Aug. 01, 1984
Frank Seibert, Rheinfelden, DE;
Gustav Wetzel, Lorrach, DE;
Abstract
A plastic scintillation detector (14) generates on the basis of ionizing radiation coming from a radiation source (16) light flashes which are converted by a photoelectric transducer (20), for example a photoelectron multiplier, to electrical output pulses. An evaluation circuit (22) counts the output pulses as a measure of the radiation intensity. For automatic stabilization of the scintillation detector a light source (24) is controlled by a driving circuit (26) in such a manner that it transmits light pulses whose intensity is modulated in accordance with a predetermined periodic function, for example a sawtooth function. The modulated light pulses are also intercepted by the photoelectric transducer (20) and converted by the latter into electrical reference pulses. A monitoring circuit (28) determines in each modulation period the number of reference pulses whose amplitude exceeds a predetermined reference threshold value lying in the modulation interval. The pulse number determined is used to stabilize the scintillation detector, either by controlling the amplification in the sense of maintaining a predetermined pulse number or by corresponding correction of the measurement result furnished by the evaluation circuit.