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Radioactive substances release three kinds of radiation depending on their type. They can release alpha, beta, or gamma radiation. While they are all harmful, gamma radiation is the most so. Radiation can alter the DNA of the cells which it comes into contact with, causing mutations. One must protect oneself from radiation because these mutation are likely to result in cancer, which is a problem that can start in one cell and move to others and causes severe health problems.

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Q: Why do you need safety precautions when using radioactive sources?
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