1. Radiations may break chemical bonds such as DNA in cells. This effect may be instantaneous, prolonged or delayed types. It may be even carried to future generations.
2. Exposure at low dose of radiation (100-250 rads), people do not die, but begin to suffer to from fatigue, vomiting and loss of hair.
3. Exposure at higher dose of radiation (400-500 rads) affect bone marrow, blood cells, natural resistance and blood to fail clot.
4. Exposure at very high dose of radiation (10,000 rads) kills the organisms by damaging the tissues of heart, brain.
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