The Model 2401-P Dose instrument is a general purpose, self-contained, pocket-sized radiation detection meter designed around the venerable GM pancake detector. A simple switch allows the user to choose among the three range multipliers. Another switch selects between QUIET (click-per-event audio off), NORMAL, BAT CHECK, or OFF. The detector is conveniently packaged inside the instrument, and has a protective screen window. The included dose equivalent filter allows users to take more accurate dose measurements (see below). A convenient L-shaped stainless steel handle provides a secure and comfortable grip when using the Model 2401-P as a survey meter. Loosening the knob permits the handle to pivot, allowing the instrument to be easily housed in the included carrying and storage case. This instrument is available with several meter face options for measuring contamination and dose rate.
The GM pancake detector has a significant over-response to gamma energies between 20 - 150 keV, which produces dose measurement errors. To counteract this, Ludlum Measurements developed a sliding filter for the Model 2401-P GM pancake dectector that flattens the response to within 20% referenced to 137Cs (662 keV) over an energy range of 20 keV to 1.2 MeV. The Model 2401-P DOSE includes this filter.
These tables list the most commonly used meter faces.
