This pocket-size instrument is a general purpose radiation detection meter designed around the venerable GM pancake detector. The detector is conveniently packaged inside the instrument with a protective screen window located on the backside of the instrument.
Model 3 Ratemeter & Model 44-9 GM Pancake Detector
This is Ludlum’s best-selling Model 3 analog ratemeter, in combination with the industry-standard Model 44-9 GM pancake detector that delivers a universal and very robust radiation counting system. The meter and probe body are constructed from cast and formed metal that withstand rugged daily use. A separate, front accessible compartment facilitates changing batteries after 2000 hours of operation.
GM pancake detectors have a significant over-response at lower energies that produce false exposure and dose readings. To correct this situation Ludlum has produced energy filters that simply snap onto the detector whenever taking readings other than contamination type.