Which term refers to a device used to spread radioactive material into the environment?

• A. Radiological Exposure Device
• B. Oxygen Deficient
• C. Odor threshold
• D. Radiological Dispersal Device

Answer: (D)

This item tests recognizing terminology for radiological threat devices. A Radiological Dispersal Device is designed to spread radioactive material into the environment, creating contamination over an area (often described as a "dirty bomb"). The harm comes from dispersal of material, not just the radiation source itself. In contrast, a Radiological Exposure Device aims to expose people to radiation without dispersing material into the environment. The other terms refer to conditions or measurements unrelated to disseminating radioactive material. So the term that matches a device used to spread radioactive material into the environment is Radiological Dispersal Device.