Combined digital and analog timepiece and radiation monitor assembly
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Abstract
A portable electronic timepiece and radiation monitor assembly formed by a timekeeping section so linked to a radiation monitoring section that the user is provided not only with a time display but also with a reading of the existing level of penetrating radiation to which he is exposed. The timekeeping section includes a stable, high-frequency time base from which is derived low-frequency timing pulses that serve to actuate an analog or digital time display. The radiation monitoring section includes electronic means such as a microprocessor coupled to a radiation detector yielding signal currents or pulses at a rate depending on the existing intensity of radiation. These electronic means are responsive to clock pulses from the timekeeping section to determine the number of radiation pulses yielded within a fixed time interval to provide a radiation intensity value whose magnitude is indicated on a radiation intensity display. In one preferred embodiment of the assembly realized in a wrist watch format, these radiation intensity values are stored in a special memory of the microprocessor and accumulated therein to provide on a radiation digital time display a reading in terms of RAD'"'"'s or other radiation measurement units giving the cumulative dosage to which the wearer has been subjected.
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Citations
22 Claims
- 1. A timepiece and radiation monitor assembly comprising:
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2. A. a case provided with a face;
- 3. B. a timekeeping section housed in the case and including a stable high-frequency time base coupled to frequency divider stages from which are derived timing pulses that are applied to a time display mounted on the face whereby the time display presents time indications in an analog or digital format, said divider stages also yielding reset pulses at timed intervals;
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4. C. a radiation detector mounted on or in the case to provide signal pulses whose rate is dependent on the prevailing intensity of penetrating radiation;
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5. D. a radiation monitoring section housed in the case and linked to the timekeeping section which functions as a timing clock therefor, the monitoring section including a resettable electronic dose rate counter responsive to said reset pulses and coupled to the radiation detector for counting the number of signal pulses received during each of said time reset intervals to provide an intensity value whose prevailing level is indicated on a radiation intensity display independent of the time display and also mounted on said face, whereby the assembly provides radiation intensity as well as time indications, said radiation monitoring section further including a manually-settable dosage counter coupled to said radiation detector for continuously counting the signal pulses received from the detector from the instant the dosage counter is reset, a dosage indicator, and a switch which when actuated transfers the count accumulated in the dosage counter to the indicator.
Specification