It was therefore planned that the meiotic stages in spermatogenesis of this species should be subjected to x-radiations with and without the maturation-stimulating influences of the anterior pituitary hormone, to determine the rapidity with which the physical changes in chromosomes are brought about by x-radiation.
Source: wiktionary
Radiation in the electromagnetic spectrum used in radiation therapy includes gamma and x-radiation; x-rays and gamma rays are found at the upper end of the spectrum with short wavelengths, high frequency, and high energies.
Source: wiktionary
With voltages above about 200 kV, in addition to efficiency we must consider the Compton effect, that is, the emission of x-radiation in a preferred direction instead of radiation with a spherical characteristic.
Source: wiktionary