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extrovertText-12翻译D留学翻译
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exposure to less than an additional one millisievert per year. The U.S. limit for radiation workers is 50 millisieverts annually, although few workers are expod to anything approaching that amount. For patients undergoing medical radiation there is no strict exposure limit—it is the responsibility of medical professionals to weigh the risks and benefits of radiation ud in diagnostics and treatment, according to Langhorst. A single CT scan, for example, can expo a patient to more than one millisievert.
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Radiation sickness (or acute radiation syndrome) usually ts in after a whole-body do of three sieverts—3,000 times the recommended public do limit per year, Langhorst says. The first symptoms of radiation sickness—naua, vomiting, and diarrhea—can appear within minutes or in days, according to the U.S. Centers for Dia Control and Prevention. A period of rious illness, including appetite loss, fatigue, fever, gastrointestinal problems, and possible izures or coma, may follow and last from hours to months. Radiation type:
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Of concern in the current situation is ionizing radiation, which is produced by spontaneously decaying heavy isotopes, such as iodine 131 and cesium 137. (Isotopes are species of
