Answer:
No, radiation and electromagnetic radiation are not the same. Electromagnetic radiation is one form or type of radiation, and there are different types of radiation. Electromagnetic radiation speaks to the propagation of electromagnetic energy, like light or radio waves, for example. The term radiation could also be used to talk about a form of radiation that takes the form of particles. This particulate radiation might be alpha particles, beta particles, neutrons or the like. There are some other ways the term radiation could be applied. But it should be noted that, though we often think of light or some other type of electromagnetic radiation when we use the term radiation, we should be aware that there are other types of radiation.
Gamma radiation and x rays are essentially the same though the sources are different, both are a part of the electromagnetic spectrum (they are photons) while alpha and beta radiation are not they are particles alphas are helium nuclei, betas are electrons.