title: A rectal monitor for use with afterloading intracavitary radioactive implants.
abstract: A battery-powered monitor that uses a miniature Geiger-Muller tube operating in the pulse-counting mode has been constructed. It is used with low-activity cesium-137 sources. The monitor gives a reading within about 1 second, has a standard deviation of 2% of the mean, and is safe, reliable, and stable.
mesh_terms: D019736:Prostheses and Implants; D011834:Radiation Monitoring / Q000295:instrumentation*; D012007:Rectum