Battery-powered detector provides constant monitoring for harmful gamma radiation, which may emanate from pre-detonated bombs. Combines wireless Radio Frequency Identification (RFID) tags with an alerting system for instantly notifying authorized personnel of radiation hazard. Includes sensors that can be placed in open areas of cargo ports, airports, or along borders to detect emissions from containers, vehicles, or people carrying hazardous radiation sources. Detects presence of radiation equal to single X-ray. Works as single detector or through companion software to network multiple detectors. Alerts authorities via alarms, pagers, or e-mail. Also displays alarms visually and graphically on a map. In addition, software supports multiple sensors to detect temperature, pressure, movement, intrusion, biological or chemical agents, and nuclear hazards.