<unk>  are produced by x-ray tubes operating at voltages in the 100–500 kV range, and therefore the x-rays have a peak energy in the 100–500 keV range.<unk>  are sometimes termed "deep" x-rays (DXR). They cover the upper limit of energies used for diagnostic radiography, and are used in external beam radiotherapy to treat cancer and tumors. They penetrate tissue to a useful depth of about 4–6 cm. This makes them useful for treating skin, superficial tissues, and ribs, but not for deeper structures such as lungs or pelvic organs.
Orthovoltage X-rays
Digital X-ray radiogrammetry
X-ray image intensifier
X-ray vision
Radiochemistry
X-ray marker
VistA Imaging
Gigli saw