Back to results
US 4,608,655 AGranted
Wristwatch dosimeter
AssigneeThe Regents of the University of California
InventorsMichael A. Wolf, David A. Waechter, C. John Umbarger
Life of this patent
Estimating the term…
Abstract
The disclosure is directed to a wristwatch dosimeter utilizing a CdTe detector, a microprocessor and an audio and/or visual alarm. The dosimeter is entirely housable with a conventional digital watch case having an additional aperture enabling the detector to receive radiation.
Claims11
A wristwatch dosimeter comprising:
- a digital wristwatch housing having a window for a numerical display and detector aperture means;
- a watch-type LCD or LED display disposed at said housing window;
- means within said housing for performing watch functions communicating with said display;
- CdTe detector means disposed in said housing behind said detector aperture means;
- means for storing predetermined safety limits of radiation field and exposure;
- microprocessor means connected to said detector means for accumulating and storing radiation field and exposure parameters;
- microprocessor means for comparing said parameters with said stored predetermined safety limits;
- and
- means for alerting a user of an unsafe condition by alarm when said parameters exceed said safety limits.
6 more elements
In a wristwatch dosimeter case including digital wristwatch electronics and display, a combination comprising:
- a CdTe crystal for generating an electric pulse when struck by radiation;
- an FET amplifier operably connected to said crystal;
- means for filtering out noise pulses operably connected to said FET amplifier;
- control processor means for storing and counting said filtered pulses comprising a programmable timer for predetermining a time period during which said filtered pulses are stored and counted, and a random access memory for storing said filtered pulses, operable on no more than 3 volts and consuming no more than 20 mW at full operation speed;
- external low power read-only memory means for storing predetermined safety limites of radiation and operably connected to said control processor means;
- and
- alarm means connected to said control processor means for alerting a user of an unsafe condition when said filtered pulses exceed said safety limits.
4 more elements
Dependencies are inferred from the claim text.