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Ionizing radiation detectors designed for automated detection of high levels (typically up to 100 roentgen/hour or more) of ionizing radiation that are an immediate hazard to humans. These detectors may use one or several different technologies (e.g., scintillation). The detectors typically include visual and/or sound indicators that show when dangerous radiation levels are present; some permit a rough estimate of the radiation levels. These detectors do not include displays showing the radiation rate. High-level ionizing radiation detectors are used mainly by healthcare personnel, rescuers, firefighters, and military personnel in highly contaminated or potentially highly contaminated radioactive areas, as a result of atomic power plant leakage, nuclear explosion, or any other event involving high-energy ionizing radiation sources.
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