Page 805 - Radiation Safety

Gas-filled Detectors

Geiger-Muller Tube - Types

• The end-window detector employs a thin wall at its end to allow most alpha and beta

radiations to enter the detector without being stopped. This detector can also measure
gamma/x-ray radiation.

• The pancake detector also has an end-window, with a wider diameter which permits

faster detection.

• A side-wall tube can detect beta and gamma or x-ray radiation using an aluminum or
stainless steel outer wall that can slides or rotates to selectively expose the actual

detector to the radiation. The window can either be opened or shut so that beta and

gamma/x-ray radiation above some energy can be detected. When shut, the window
permits the detection of only gamma or x-ray radiation.