Abstract: A method for communicating the detection of hazardous materials, such as a radioactive substance. The method includes detecting at least one hazardous material. This step may be realized using a detector positioned with a wireless unit, for example. Thereafter, at least one wireless unit transmits a notification message in response to detecting hazardous material. The notification message is then received by at least one processing center. The geo-location of the wireless unit and the source of the notification message are subsequently calculated so that the processing center may track the hazardous material, in the event it is mobile.