A radiation threat, commonly referred to as a “dirty bomb” or “radiological dispersion device (RDD),” is the use of common explosive devises to spread radioactive materials over a targeted area. In contrast to a nuclear blast, the force of the explosion and radioactive contamination will be more localized. While the initial explosion will be easily identified, the presence of radiation will not be clearly defined until trained personnel are able to use specialized equipment to monitor the explosion area. As with any radiation, the best policy is to try to limit exposure. It is also important to avoid inhaling the radioactive dust that may be released into the air.