Radiological dispersal devices (RDDs) are weapons of mass disruption rather than weapons of mass destruction. "Dirty bombs" are examples of RDDs. As the name suggests, an RDD aims at dispersing radioactive material over an area, causing high cleanup costs, psychological, and economic damage. Nevertheless, direct human losses caused by RDDs are low and not attributed to the radiological aspect. RDDs are easily fabricated and components readily obtainable. RDDs are comparatively easy to detect with RPMs due to their high level of radioactivity. RDDs  emit gamma radiation as well as sometimes, depending on what isotopes are used, neutrons.