I. The Saskatchewan Cobalt 60 Unit

Cobalt-60 tomotherapy: Clinical treatment planning and phantom dose delivery studies

“…Cobalt-60 (Co-60) teletherapy 1,2 was the most popular radiation therapy unit from mid-1950s to 1960s and introduced high energy photon radiation treatment. In the past five decades, tremendous research and innovation has gone into improving radiation therapy, particularly, through the development of intensity modulated radiation therapy (IMRT) techniques.…”

Some Less Common Therapeutic Uses of Radioisotopes

“…By surrounding such a source with sufficient lead protection and fitting a shutter and an efficient collimating system, a beam of gamma rays is obtained comparable in every way with the beam of x-rays produced by a supervoltage machine. One example of such a therapy unit has been described by Green and Errington (1952) and another by Johns, Bates and Watson (1952). An improved collimating system for the second unit has more recently been fitted (Johns and MacKay, 1954).…”