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Gamma rays are very energetic forms of electromagnetic radiation, so when they collide with some molecule in the body, the molecule will be damaged or destroyed. Some molecules are more important than others, but there are some which can potentially cause a lot of trouble if they are damaged, particularly genetic material, which may be altered into a form that leads to cancer.

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14y ago
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12y ago

At a low dose, gamma rays can kill cancer cells, but too much of it can kill normal cells as well.

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13y ago

It damages the DNA.

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Q: Why are gamma rays bad?
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