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The syndromes of acute radiation illness can be divided into three categories based on the amount of radiation dosage in total. The gray (symbol: Gy) is the SI unit of absorbed radiation dose of ionizing radiation and is defined as the absorption of one joule of ionizing radiation The Hair Growth Blueprint Review by one kilogram of matter (usually human tissue). It is interesting to note that in radiation therapy, the amount of radiation varies depending on the type and stage of cancer being treated. For curative cases, the typical dose for a solid epithelial tumor ranges from 60 to 80 Gy, while lymphomas are treated with 20-40 Gy. Preventive (adjuvant) doses are typically around 45-60 Gy in 1.8-2 Gy fractions (for breast, head, and neck cancers). Along with red cells, radiation sickness can reduce the risk of infection-fighting white cells in the body. As a result, the risk of bacterial, viral, and fungal infections is heightened. The average radiation dose from an abdominal X-ray is 1.4 mGy, that from an abdominal CT scan is 8.0 mGy, that from a pelvic CT scan is 25 mGy, and that from a selective CT scan of the abdomen and the pelvis is 30 mGy.
The cerebrovascular (brain) syndrome - This is when the total dose of radiation is extremely high, exceeding 20-30 Gy. A person with cerebrovascular (brain) syndrome rapidly develops confusion, nausea, vomiting, bloody diarrhea, and shock. Within hours their blood pressure falls due to heart and circulatory damage, accompanied by the inability to coordinate gait, seizures and coma. Patients often die within hours (usually within the first two days) after severe radiation exposure. In particular, the cerebrovascular syndrome has 3 phases: the first period of nausea and vomiting; then listlessness, drowsiness, apathy and confusion; and finally, tremors, convulsions, seizures, coma, with death usually within a few hours. Since the cerebrovascular syndrome is always fatal, treatment is geared toward providing comfort by relieving pain, anxiety, and breathing difficulties. The gastrointestinal syndrome occurs when the radiation dose is smaller but still high, and is due to the effects of radiation on the cells lining the digestive tract. Doses in the 10-20 Gy range affect the intestines, stripping their lining and leading to death within three months due to causes of vomiting, diarrhea, starvation, and infection.
Victims receiving 6-10 Gy all at once usually escape an intestinal death, but instead face bone marrow failure and death within two months from loss of blood coagulation factors and the protection against infection provided by white blood cells. The symptoms of people suffering from gastrointestinal syndrome include nausea, vomiting and diarrhea that can lead to severe dehydration, diminished blood plasma volume and vascular collapse that can result in death within 3-10 days. Severe nausea, vomiting, and diarrhea begin 2-12 hours after exposure to 4 Gy or more of radiation and the symptoms may lead to severe dehydration, but they usually resolve themselves after two days. After this period of feeling well, severe diarrhea (often bloody) returns, once more producing a state of dehydration.