CA1066433A
Expired / Lapsed
CA
⏱️ 0.0 years remaining
Radiacmeter with flashing light readout
Assignee: Department of National Defence
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Filing: 1976-02-27
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Granted: 1979-11-13
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Expires: 1996-02-27
Abstract
Abstract Abstract A low cost, hand held gamma radiation dose rate meter covering the dose rate range 0.1 to 100 R/hr, in which pulses from a Geiger-Mueller tube are amplified, counted and fed to a plurality of inter-connected light emitting diodes (LEDs) which flash at a rate proportional to the dose rate. The LEDs are interconnected so that only one can be on at any time thereby reducing peak current drain and making the dis-play simpler to read. The meter is contained in a pocket sized case which incorporates a battery and which may be moulded in plastic or die cast in metal.
Inventors
- 👤 Philip C. East
Bibliographic Details
Application Number
—
Jurisdiction
CA
Data Source
google_patents
Last Synchronized
2026-11-06 10:25
CPC Classifications
G; G01; G01T; G01T1/00; G01T1/16; G01T1/18
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
102 words
A hand held self contained gamma radiation dose rate meter comprising: a substantially rigid, pocket sized casing which contains: (a) a power supply means; (b) a Geiger-Mueller tube, operatively connected to said power supply; (c) means for counting pulses transmitted by said Geiger-Mueller tube in the presence of ionizing radiations over a preselected time period; and (d) a plurality of light emitting diodes operatively interconnected with said counting means, each of which is adapted to flash at a different rate proportional to said counted pulses over a predetermined counting period thereby providing a substantially continuous visual display of a received dose rate.
Claim 2
Dependent Claim
102 words
A hand held self contained gamma radiation dose rate meter comprising: a substantially rigid, pocket sized casing which contains: (a) a power supply means; (b) a Geiger-Mueller tube, operatively connected to said power supply; (c) means for counting pulses transmitted by said Geiger-Mueller tube in the presence of ionizing radiations over a preselected time period; and (d) a plurality of light emitting diodes operatively interconnected with said counting means, each of which is adapted to flash at a different rate proportional to said counted pulses over a predetermined counting period thereby providing a substantially continuous visual display of a received dose rate.
Claim 3
Dependent Claim
32 words
A radiation dose rate meter as claimed in claim 1 and including (e) means for amplifying said pulses transmitted from said Geiger-Mueller tube interposed between said Geiger-Mueller tube and said counting means.
Claim 4
Dependent Claim
30 words
A radiation dose rate meter as claimed in claim 1 which includes coloured light emitting diodes each of which flashes at a rate proportional to a decade of dose rate.
Claim 5
Dependent Claim
33 words
A radiation dose rate meter as claimed in claim 3 including timing delay means for effecting a blank period, between each successive counting period, during which all said light emitting diodes are off.
Claim 6
Dependent Claim
39 words
A radiation dose rate meter as claimed in claim 1 including means for actuating one of said light emitting diodes for a short period of time in the absence of a radiation field, thereby providing an indicator of operability.
Claim 7
Dependent Claim
31 words
A radiation dose rate meter as claimed in claim 3 including means to prevent flashing of two of said light emitting diodes when a third said light emitting diode is flashing.
Claim 8
Dependent Claim
17 words
A radiation dose rate meter as claimed in claim 3 having three differently coloured light emitting diodes.
References Cited (Backward Citations)
No citation records indexed.
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