Model 26-1 Frisker User’s Manual Section 3
Ludlum Measurements, Inc. Page 3-1 April 2017
Specifications
0
Detector: pancake GM (Geiger-Mueller) detector, stainless steel screen
Linearity: ±10%
Window Area: Active: 15.51 cm² ( 2.4 in²); Open: 12.26 cm² (1.9 in²)
Window Protective Screen: 79% open
Efficiency (4pi) Surface Plane:
Alpha: 11% for
239
Pu
Beta: 18% for
99
Tc; 32% for
32
P; 2% for
14
C; 22% for
90
Sr/Y;
0.2 % for
125
I
Gamma: 3300 cpm/mR/h or 5.5 cps/μSv/h (
137
Cs);
≤ 1% for
99m
Tc
Resolving Time: approximately 110 µsec as defined by IEC 60325
Alarms: rate and count alarm setpoints adjustable over the display range for
Primary and Secondary units
Overload: high rate saturation protection, indicated by flashing display and
audio alarm, prevents false display of lower count rates
Zero Protection: after 60 seconds of no pulses from detector, unit will flash a
zero reading and the alarm audio will be triggered
LCD Display: 3½ digit LCD with large 12.7 mm (0.5 in.) digits, (k)cps,
(k)cpm, (k)Bq, (k)dpm, mR(/h), µSv(/h), low-battery indicator, MAX, ALARM
Display Range:
0.0 cps to 19.9 kcps
0.00 cpm to 999 kcpm
0.0 Bq to 19.9 kBq
0.00 dpm to 999 kdpm
0.0 to 500 mR/h
Sectio
3
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