Radiation exposure can do harm and permanent damages to the human body:
1. A single dose of 1,000 milli-sieverts, or radiation units, affects the intestinal tract causing nausea and vomiting.
2. At higher levels, radioactive iodine can destroy parts or all of the thyroid.
3. Intense exposure to radioactive material from 10,000 milli-sieverts per hour would do immediate damage to small blood vessels and probably cause heart failure.
4. Cancer is the biggest long term risk.
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