Question

Why radiations affect humans? How they can cause a cancer?

Answer 1

Ionizing radiation interacts with atoms and molecules of the human's body. Atoms turn into ions during the interaction process. So, natural chemical bonds between molecules are destroyed. It causes the changes in the body.
Cancer is an uncontrolled growth of cells. A healthy body controls the mechanisms of growth and development of cells and the process of restoration of damaged tissues. The radiation breaks the natural chemical bonds between molecules. So, the natural mechanisms of the body are disrupted. It leads to uncontrolled growth of cells.