Hospitals commonly used machines that use x-rays

A, B, ultraviolet light has a strong chemical effect, can be sterilized, made of disinfection lamps, but also has a fluorescent effect, can be made into a money detector to check the money, so AB does not meet the title;

C, X-rays have a strong penetrating ability, often used in medical treatment to check the body line, so the C is consistent with the meaning of the question;

D, infrared radiation has a significant thermal effect can be made into a thermal spectrometer, made of infrared Night vision, infrared can be used for remote control, made of TV remote control. Therefore, the D option does not meet the meaning of the question.

Therefore, the choice: C.