Raelitation is not a widely recognized term and may be a typographical error or a blend of "relation" and "radiation." If you meant "radiation," it refers to the emission of energy as electromagnetic waves or particles, which can include gamma rays, X-rays, ultraviolet light, and more. Radiation can occur naturally, such as from the sun, or be man-made, like in medical imaging. If you meant something else, please provide more context!