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:
Nov. 29, 1977
Filed:
Oct. 18, 1976
Samuel H Luitwieler, La Mirada, CA (US);
Donald L Horrocks, Placentia, CA (US);
Beckman Instruments, Inc., Fullerton, CA (US);
Abstract
A method and apparatus for the calibration of a gamma radiation measurement instrument to be used over any of a number of different absolute energy ranges. The method includes the steps of adjusting the overall signal gain associated with pulses which are derived from detected gamma rays, until the instrument is calibrated for a particular absolute energy range; then storing parameter settings corresponding to the adjusted overall signal gain, and repeating the process for other desired absolute energy ranges. The stored settings can be subsequently retrieved and reapplied so that test measurements can be made using a selected one of the absolute energy ranges. Means are provided for adjusting the overall signal gain by varying the voltage supplied to a multiplier phototube included in the instrument, or by varying the gain of attenuators coupled to the output of the phototube. A specific technique is disclosed for making coarse, then fine adjustments to the signal gain, for rapid convergence on the required calibration settings.