What is the term for a period of low X-ray emissions ?
Synchrotron radiation is extremely bright and monochromatic without thermal scattering loss , but its brightness falls off at the 4th power of the photon energy , and at 15-20 kV or higher , a low cost X-ray tube with a Moly target for example , could deliver as much X-ray fluence as that of a typical moderately - sized synchrotron instrument .