Prolonged or repeated exposure of X-rays can cause mutations in DNA that leads to Cancer.
Mutation is the change in sequence of DNA due to any reason such as, deletion, insertion, duplication etc.
X-rays slowly causes changes in DNA, resulting in mutation. This mutation progresses further and can lead to diseases like cancer.
Thus, Medical professionals wear lead aprons to protect themselves from x-rays because prolonged or repeated exposure can cause mutations in DNA which can lead to cancer.
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