| 摘要 |
A portable solid-state radiation dosimeter provides either a cumulative reading or time base reading and includes means for generating an alarm condition when preset radiation levels are reached or exceeded. The dosimeter preferably employs a cadmium telluride crystal biased to provide a count signal corresponding to the level of radiation. The circuitry for processing the crystal signal includes a field effect transistor which provides pre-amplification, one or more stages of main amplification including noise threshold setting, and a frequency to voltage converter for essentially counting radiation pulses. One output from the converter may be an alarm signal that is tripped when a predetermined voltage is reached. Also, a digital reading of radiation count may be provided.
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