One or more aspects of the invention is directed to a radiation-shielding container for housing a radiopharmaceutical. A labeling system is attached to an exterior surface of the container. The labeling system is adapted to selectively convert from a first state to a second state. In the first state, the labeling system indicates a first condition of the radiopharmaceutical. For example, in the first state, the labeling system can show that the radiopharmaceutical is ready for administering. In the second state, the labeling system indicates a second condition of the radiopharmaceutical. For example, in the second state, the labeling system can show that the radiopharmaceutical has been administered, and/or that a syringe that was used to administer the radiopharmaceutical is now a biohazard.