Yawning redirects here. For the fish species, see Yawning (fish) . A yawn is a reflex consisting of the simultaneous inhalation of air and the stretching of the eardrums, followed by an exhalation of breath.Yawning (oscitation) most often occurs in adults immediately before and after sleep, during tedious activities and as a result of its contagious quality. yawn is a reflex consisting of the simultaneous inhalation of air and the stretching of the eardrums, followed by an exhalation of breath. Yawning (oscitation) most often occurs in adults immediately before and after sleep, during tedious activities and as a result of its contagious quality.
A radiological emergency is an emergency in which there is, or is perceived to be, a hazard due to radiation exposure from a source. As sources of radiation are used in various fields, including industry, medicine and research, radiological emergencies may occur anywhere. These are examples of radiological emergency situations and associated conditions that a first responder may face: 1  Medical Symptoms of Radiation Exposure. 2  Loss or Theft of Dangerous Radioactive Source. 3  Public Radioactive Contamination/Exposure.
Radiological terrorism is the deliberate use of radioactive material to expose people to radiation and/or to contaminate an area with radioactivity. Terrorists could use a radiological dispersion device (RDD), a radiation exposure device (RED), or sabotage a nuclear facility. 1  A radiological attack would be far easier for terrorists to execute than a nuclear attack, but could not cause similarly catastrophic levels of damage or casualties [i] One of the most significant impacts would be the fear of radiation triggered in the population by such an event, possibly resulting in mass panic [ii]