G - Physics – 01 – J
Patent
G - Physics
01
J
354/143, 340/155
G01J 1/42 (2006.01) F23N 5/08 (2006.01) F23N 5/24 (2006.01) G01J 5/10 (2006.01) G08B 17/12 (2006.01)
Patent
CA 1069997
ABSTRACT OF THE DISCLOSURE Methods and apparatus for optimising the response of a radiation detecting device such as a cold cathode discharge tube are disclosed. The tube is energized at each instant of repeated sequences of successive time instant which are fixed in time relative to a time datum, and held energised for not more than a respective activation period following each said instant, consecutive activation periods being mutually separated by recuperation time periods. Response of the device during each of the activation periods is sensed for, and a warning output is produced only when the device responds during each of the activation periods of at least one sequence. The lengths and number of activation periods during each sequence are selected to increase the probability of a warning output being produced in response to radiation of a predetermined wavelength relative to the probability of a warning output being produced in response to background radiation. - 1 -
237636
Farquhar Robert L.
Snook Phillip D.
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