Radiant energy – Invisible radiation responsive nonelectric signalling – Luminescent device
Patent
1980-01-28
1981-03-10
Anderson, Bruce C.
Radiant energy
Invisible radiation responsive nonelectric signalling
Luminescent device
250486, G01J 158
Patent
active
042556651
ABSTRACT:
A credit-card-size clear-plastic-encased device which can be worn or carried by a person to warn him of the momentary presence of dangerous intensitives of ultra-violet and/or X-ray radiations. A base lamina (e.g. of cardboard) is coated with a material (e.g. zinc-cadmium sulfide or lead-barium sulfate) which fluoresces under such radiations. Numerals, letters, words or symbols are printed over the fluorescent coat with a material inhibitory to said radiations so that a warning message in dark print will appear on a light background when dangerous intensities of said radiations are present. An X-ray-warning area is covered with an ultra-violet absorbing screen so that said area will glow only under X-rays (which rays will also activate the remaining ultra-violet-responsive area). The colors of the laminas and the coats are so selected that the messages are not visible when dangerous radiations are not present. If desired, only the message can be printed with fluorescent material so as to glow on a darker background. Optionally, step-layer-attenuation devices can be added to indicate degrees of radiation; and reflecting surfaces can underlie the fluorescent coat to increase efficiency and/or sensitively.
REFERENCES:
patent: 2459694 (1949-01-01), Gordon
patent: 2509766 (1950-05-01), Gross
patent: 2616051 (1952-10-01), Daniels
patent: 2949880 (1960-08-01), Fromer
patent: 3194963 (1965-07-01), McKee
patent: 3597054 (1971-08-01), Winter
Anderson Bruce C.
Staubly Ralph F.
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