Unlike other meter and detector combinations that require two-handed operation, the Model 26-3 combines the meter electronics and detector into a single, easy-to-use tool, simplifying the process of detecting radioactive contamination on people and objects. This optimized configuration incorporates a standard 15.5 cm² pancake GM probe and a large, auto-ranging LCD with automatic backlighting into an ergonomic housing with three button controls, allowing for one-handed operation.
Three modes of operation are available – RATE, MAX, and COUNT – which can be selected by pressing the MODE button. RATE mode displays the current count, exposure, or activity rate. MAX mode captures the highest count, exposure, or activity rate detected; this is useful for finding a peak rate or for frisking when the display is not visible. COUNT mode allows the user perform a survey or scaler count for a predetermined time, up to 20 minutes. Depending on the chosen units, the count result can be a scaler count, a time-averaged rate, a time-averaged exposure or dose rate, or an integrated exposure or dose. Measurements can be displayed in units of cps, cpm, dpm, Bq, mR/h, or μSv/h. The user can switch between two sets of chosen units (primary and secondary) for RATE and MAX modes by pressing the UNITS button.
Other features include “click” audio and user-settable count rate and scaler alarms. The instrument body is made of high-impact plastic, and water-resistant construction allows the instrument to be used outdoors. A wrist strap and lanyard are included for keeping the instrument close and secure. The instrument is powered by two alkaline AA batteries with a battery life of up to 1000 hours.
The GM pancake detector has a significant over-response to gamma energies between 20 to 150 keV (see Energy Response Graph on Graphs tab below), which produces dose measurement errors. Ludlum offers an ambient dose equivalent filter that flattens the detector’s energy response to within ± 20% referenced to 137Cs (662 keV) over the energy range of 20 keV to 1.2 MeV. The filter simply snaps on over the detector window when dose measurements are required, and is easily removed when not needed. The dose filter is included with the Model 26-3DOSE (PN 48-4233), or it is available separately as an option (PN 2002-1050).
2002-1050(dose filter only)
4519-041-02(dose filter with tether)
A lightweight pole with 5 telescoping sections and an adjustable clamp to hold a Model 26 Series Frisker. Useful to access high, low, or other hard to reach places.
Length: 0.55 m (1.8 ft) collapsed, 1.5 m (4.92 ft) fully extended
