Abstract: A tracking device for tracking with a radioactive material, a container including such a device, and a tracking method are described. The device has a radiation detector associatable with a radioactive material adapted to be placed in use within a container defining a radiation-shielded enclosure for containing a radioactive material, to detect radiation activity from the material. A RF identification module associatable with the container includes a data register to store a unique product identification code, a processor with a data transfer link to the radiation detector and data register to receive and process a live data stream of activity data from the detector and associate this with the unique product identification code in a processed data packet, and an antenna to enable transmission of a data item comprising both the unique product identification code and processed activity data to a remote data capture means.