Abstract: A sterilizing system including a sterilization device that emits UVC radiation and visible radiation into an irradiation field, a sensor to detect an object within the irradiation field and measure photoluminescence of a target pathogen within the irradiation field, and an indicator device. Control circuitry may control operation of sterilizing radiation responsive to detecting the target pathogen and collect information about contamination levels. A server may collect and aggregate contamination level information from multiple sterilization devices.