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The human LD50 for total body ionizing radiation is roughly 400 REM. This can come from any mixture of x-rays, gamma rays, beta particles, or neutrons. The sickness is due to acute cell death. Much of this cell death at this dose level is in the intestines and the person dies of dehydration due to uncontrollable diarrhea.

Above about 1500 REM death is 100% regardless of any attempt at medical treatment.

Above about 10,000 REM death is almost instant due to massive nerve cell death.

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