Abstract: A radiation monitoring system and method characterized by the use of paired active and passive radiation detectors to monitor exposure to a radiation field. The active detector provides an output representative of radiation exposure on a real time basis while the passive detector is readable on a delayed basis after exposure to radiation for a period of time to provide an output representative of radiation exposure over said period of time. Respective readers are provided for extracting the radiation exposure information from the detectors, as is a processor which determines a quantity of radiation exposure from the radiation information extracted from the detectors. The processor corrects radiation exposure data derived from one of the detectors using radiation exposure data derived from the other of the detectors.

Abstract: 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.