Acute radiation syndrome (
ARS), also known as
radiation poisoning,
radiation sickness or
radiation toxicity, is a collection of health effects which present within 24 hours of exposure to high amounts of
ionizing radiation. The radiation causes cellular degradation due to damage to DNA and other key molecular structures within the cells in various tissues; this destruction, particularly as it affects ability of cells to divide normally, in turn causes the symptoms. The symptoms can begin within one or two hours and may last for several months. The terms refer to
acute medical problems rather than ones that develop after a prolonged period.