And also please elaborate how the radioactive substances from a nuclear bomb will affect our human body. Radioactivity is the spontaneous disintegration of certain unstable nuclei, accompanied by the emission of alpha particles, beta rays or gamma rays. Ionising radiations emitted by radioactive materials are physiologically harmful. Biological effects include cancer induction as well as gene or chromosome mutations. Therefore, special precautions must be taken in handling radioactive materials.
Prevention is always better than cure.