Orthovoltage is a type of radiation therapy that has been available for over 60 years. The x-rays are strong enough to kill cancer cells but do not penetrate more than a few millimeters beyond the surface of the skin. Orthovoltage treatments are given for very superficial, small tumors such as skin cancers. Orthovoltage is an excellent alternative to surgery for skin cancer in sensitive locations such as the folds of the nose or the eyelids. Treatments take 15 minutes per day and are given everyday for 3 to 4 weeks.