![]() For more information, see CDC’s fact sheet “Acute Radiation Syndrome” at /radiation/ars.htm.Īir burst: a nuclear weapon explosion that is high enough in the air to keep the fireball from touching the ground. If the exposure has been approximately 1,000 rads or more, death may occur within 2 – 4 weeks. Hair loss, bleeding, swelling of the mouth and throat, and general loss of energy may follow. The earliest symptoms are nausea, fatigue, vomiting, and diarrhea. See also chronic exposure, exposure, fractionated exposure.Īcute Radiation Syndrome (ARS): a serious illness caused by receiving a dose greater than 75 rads of penetrating radiation to the body in a short time (usually minutes). For more information, see “ Primer on Radiation Measurement” at the end of this document.Īctivity (radioactivity): the rate of decay of radioactive material expressed as the number of atoms breaking down per second measured in units called becquerels or curies.Īcute exposure: an exposure to radiation that occurred in a matter of minutes rather than in longer, continuing exposure over a period of time. It is expressed in units of joule per kilogram (J/kg), and called “ gray” (Gy). See also risk, relative risk.Ībsorbed dose: the amount of energy deposited by ionizing radiation in a unit mass of tissue. Absolute risk: the proportion of a population expected to get a disease over a specified time period.
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