Radiant energy – Invisible radiant energy responsive electric signalling – With or including a luminophor
Patent
1995-11-03
1996-10-22
Willis, Davis L.
Radiant energy
Invisible radiant energy responsive electric signalling
With or including a luminophor
25037011, 2504831, G01T 1202
Patent
active
055679439
ABSTRACT:
A personal radiation detection device is provided having a housing containing within at least one sheet of rare earth intensifying screen that interacts with ionizing radiation when present at a specified exposure level to generate visible light and a plurality of photoresistors which is sensitive to the visible light and conducts a voltage upon the detection of the light. A specular reflector such as reflective tape, foil, or a finely polished mirror is also provided to reflect any stray visible light in the direction of the photoresistors. The photoresistors send a signal through a resistor to an operational amplifier which then activates an indicator including a light and/or an audible buzzer. The lightweight housing may also be provided with a slot on an outside surface to hold standard photographic film used to monitor cumulative exposure to radiation. A battery is provided to generate power to operate the device.
REFERENCES:
patent: 3345516 (1967-10-01), Nicholson et al.
patent: 3765006 (1973-10-01), Takahasi et al.
patent: 4197461 (1980-04-01), Umbarger et al.
patent: 4320393 (1982-03-01), Engdahl
patent: 4694177 (1987-09-01), Akai
Hanig Richard
Willis Davis L.
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