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Extremely high radio frequency power densities exist in the vicinity of modern microwave transmitting equipment and constitute a hazard to personnel and material. This paper discusses the problem and describes a new simple means of measuring and indicating the presence of hazardous microwave radiation. The equipment described utilizes a unique integrating component to accumulate the total radiation received from hazardous RF sources during a fixed sampling period. In this manner it correctly measures the damaging dosage received from RF sources which often produce widely time varying fields due to pulsing and antenna scanning.