A GAMMA RADIATION ALARM UNIT
An instrument was developed to give visual and aural warnings when pre- determined gamma radiation levels are exceeded. An ionization chamber is employed as the detector, with a single electrometer valve in the measuring circuit. The meter movement incorporates two photo-transistor devices that are actuated by movement of the meter needle. These provide a means of initiating the operation of alarm circuits at two radiation levels, differing by a factor of ten in magnitude. In the instrument described these levels correspond to gamma dose rates of 30 mr/hr and 300 mr/hr, but different levels can be obtained by changing the value of the electrometer valve grid resistor. In addition, allowance has been made for providing visual and audible indication at a remote point. (auth)
- Research Organization:
- United Kingdom Atomic Energy Authority. Research Grpup. Atomic Energy Research Establishment, Harwell, Berks, England
- NSA Number:
- NSA-14-011733
- OSTI ID:
- 4179248
- Report Number(s):
- AERE-R-3151
- Country of Publication:
- United Kingdom
- Language:
- English
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