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Related to secondary rays: secondary cosmic rays
x-rays generated when primary x-ray's impinge upon matter; scattered radiation.
X-ray photons produced after the incoming, primary x-ray photons remove an inner-shell electron from the atom. Secondary rays can also be primary x-rays that have been diverted through scatter interactions with other atoms. Secondary rays are of lower energy than primary rays and are usually absorbed in matter, an interaction that produces x-ray photons via a cascade effect.
See also: ray