X-radiation vs X-raying

X-radiation and X-raying both are nouns.

Word	Noun	Adjective	Verb	Adverb
X-radiation	Yes	No	No	No
X-raying	Yes	No	No	No

As nouns, X-radiation and X-raying are synonyms defined as:

X-radiation (noun)	X-raying (noun)
obtaining images by the use of X rays	obtaining images by the use of X rays
electromagnetic radiation of short wavelength produced when high-speed electrons strike a solid target