Applied Radiation Biology and Radiotherapy (ARBR)


Teletherapy is clinically administered by the application of electro-magnetic radiation or electrons.

Electromagnetic radiation may be X-rays - radiation produced, when an accelerated electron hits a target.

  • Contact therapy < 100 kV
  • Superficial voltage ~ 100 kV
  • Orthovoltage ~ 150 - 300 kV
  • Megavoltage ~ 4 MeV - 25 MeV

or gamma rays - radiation emitted from radioactive elements or isotopes.

While Ra-226 and Cs-137 have been used as gamma emitters, the modern radiotherapy department frequently relies on Co-60 teletherapy machines which operate as megavoltage equipment.