wikipedia uses Wiktionary saying that X -ray is the alternative way of X -Rays.

Control in the user manual of Chicago style, 16th version, X -ray not to be capitalized. No, if it's a name, verb or adjective. This is the standard to write novels.

131 The confusion comes from the origin of "x -ry" (or x -ray). Wilhelm Röntgen, a German, discovered and called her. However, all names activated in German and other parts of the language are not. It is not the source of the capital "X". Ironically, X -Rays in German is now called "X -Ray" and the verb "x -ry", "x -rays". X -Rays composed with other wavelengths of light, gamma rays, radio waves, infrared rays, ultraviolet rays, etc.


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