Light, radio waves and X-rays have one thing in common: they are all forms of electromagnetic radiation. All electromagnetic radiation consists of photons. These are particles that consist of an electric and magnetic field. Photons that vibrate quickly, such as in gamma rays, contain a lot of energy. Radio photons are very faint and spread over a wide area. That is why you can look much more accurately with gamma radiation than with radio radiation.
Since gamma photons are very high in energy, they are also dangerous. They whack electrons off atoms without any problem. Radio photons are far too weak for that. If that atom is part of, for example, a DNA molecule, this has unpleasant consequences. A so-called free radical is created. The molecule is mutilated. A mutation can develop and possibly even cancer. That is why there are thick protective lead shields around sources of gamma radiation.