Ludlum - Model 26 Frisker

Ludlum Model 26 Digital Contamination Frisker

Frisking people and objects for alpha & beta contamination has always been a little awkward because manipulation of the cable, detector, and electronics required the use of both hands. The new cable-less Ludlum Model 26 consolidates the electronics and the detector into one ergonomic housing. This optimized configuration incorporates a standard 15 cm² GM pancake probe, loud audio “click” output, and large auto-ranging LCD display with automatic back lighting into one convenient package, making it easier than ever to detect contamination.

Operation is kept extremely simple through the use of just two buttons. A useful feature employed in the design is the MAX mode, which captures the highest or peak count rate. It is particularly convenient whenever the display is not directly visible. The scaler mode, with a preset count time, allows the user to take a discrete measurement. This system also incorporates low power circuitry, delivering hundreds of hours of use with just two standard “AA” size batteries. The calibrator can protect parameters (cps/cpm, response time, alarm points, & scaler time) or allow the user to adjust them.



Indicated Use Contamination monitoring

Alpha: 11% for Pu-239

Beta: 18% for Tc-99, 32% for P-32, 2% for C-14, Sr-90 22%

Resolving Time Approximately 100 microseconds as defined by IEC 6325
Threshold Fixed at 40 mV to 10 mV
Alarms Count rate and scaler alarm setpoints adjustable over the display range
LCD Display
3½ digit LCD with large 12.7 mm (0.5 in.) digits, cpm, cps, low battery indicator
Response Time
User-selectable from 1 to 60 seconds, or automatic FAST or SLOW
Temperature Range -20 to 50 °C (-4 to 122 °F), may be certified for operation from -40 to 65 °C (-40 to 150 °F)
Power Two "AA" Cell Batteries
Battery Life Typically 1000 hours with alkaline batteries
Size 4.6 x 6.9 x 27.2 cm (1.8 x 2.7 x 10.7 in.) (H x W x L)