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Ludlum Model
26
Radiation Frisker
 Features
● Integrated,
Lightweight Frisker
● Alpha, Beta, Gamma
Survey, Sample Counting
● Standard
15 cm2 GM Pancake Detector
● Ratemeter,
Peak and Scaler Operating Modes
● Count
Rate and Scaler Alarms
● Simple
Two-Button Operation
● Automatic
LCD Backlight Activation
● Protective
Rubber Covering
Introduction
Frisking people
and objects for alpha and beta radiation 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, and
scaler time) or allow the user to adjust them.
Specifications
PART NUMBER: 48-3885
RADIATION DETECTOR: pancake GM (Geiger-Mueller)
detector, stainless steel screen
WINDOW AREA:
Active: 2.3 in² (15 cm²); Open: 1.9 in² (12.2 cm²)
EFFICIENCY (4 π):
Alpha: 11% - 239Pu; Beta: 18% - 99Tc; 25% - 32P;Gamma:
3300 cpm/mR/hr (137Cs)
RESOLVING TIME: approximately 100 microsec as
defined by IEC 6325
ALARMS:
count rate and scaler alarm setpoints adjustable over the display range
OVERLOAD:
high count rate saturation protection prevents false display of lower count
rates
LCD DISPLAY:
3½ digit LCD with large 0.5 in. (12.7 mm) digits, cpm,
cps, low battery indicator
RANGE: 1
cpm to 99.9 kcpm
BACKLIGHT:
built-in ambient light sensor automatically activates low-power LED
backlight, or may be configured for 'Continuous On' operations (will reduce
battery life)
CONTROLS:
two pushbuttons
OFF/ON/QUIET:
press to turn ON, tap to alternate between click audio
and QUIET, hold for OFF
MODE:
alternates between Normal (countrate) and Max (captures peak rate), and
Scaler (user-selectable preset count time from 0 to 20 minutes). Each mode
is separately programmable so it can be active or turned off.
RESPONSE TIME: user-selectable from 1 to 60
seconds, or automatic FAST or SLOW
CLICK AUDIO:
greater than 60 dB at 2 ft (0.6 m)
POWER: two
“AA” batteries
BATTERY LIFE:
approximately 1000 hours of operations (as low as 500 hours with backlight
configured for 'Continuous On'), 16-hour low battery warning
CONSTRUCTION:
high-impact plastic with separate battery compartment
ENVIRONMENTAL RATING: NEMA 3/ IP 53
SIZE: 1.8 x
2.7 x 10.7 in. (4.6 x 6.9 x 27.2 cm) (H x W x L)
WEIGHT: 1.0
lb (0.45 kg)
Options
● Check
Source
● Case
Technical Information
● Data
Sheet ● Product
Manual
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