Indicated Use:
Alpha, beta, low-energy gamma survey
Internal Detector:
Type: Pancake-style GM detector with 1.7 ± 0.3 mg/cm² window; stainless steel protective screen (79% open)
Active Area: 15.51 cm2 (2.4 in2)
Open Area: 12.26 cm2 (1.9 in2)
Efficiency (4Ï€): 14C: 5%, 90Sr/90Y: 23%, 99Tc: 19%, 32P: 33%, 239Pu: 15%
Sensitivity (137Cs gamma): Typically 3300 cpm per mR/hr
Alpha-Beta Shield: Retractable 211 mg/cm2 phenolic slide
External Detector:
Type: Model 44-3: 125I and low-energy gamma scintillator
Efficiency (4Ï€): 125I: 33.5% (based on 129I efficiency of 18%)
Sensitivity (125I): 675 cpm per μR/hr
Energy Range: Recommended 5 keV to 60 keV
Background (10 µR/hr): < 350 cpm
Linearity:
Reading within ±10% of true value with detector connected
Meter Dial:
0 - 5 kcpm, BAT TEST
(Meter Faces tab lists other available meter faces)
Meter:
6.4 cm (2.5 in.) arc, 1 mA analog type
Controls:
Rotary Selector Switch: x0.1, x1, x10, x100
Response Switch: Toggle switch for FAST (4 s) or SLOW (22 s) from 10% to 90% of final reading
Reset Push-Button: Push-button to zero meter
Audio Switch: Built-in unimorph speaker with ON/OFF switch (greater than 60 dB at 0.61m [2 ft])
Calibration Controls: Accessible from front of instrument (protective cover provided)
Int/Ext Switch: Selects the internal GM detector or the external detector
High Voltage:
Adjustable from 400 to 1500 V
Threshold:
-30 mV ± 10 mV
Temperature Range:
-20 to 50 °C (-4 to 122 °F)
Power:
2 "D" cell batteries (housed in sealed compartment that is externally accessible)
Battery Life:
Typically 600 hours with alkaline batteries (battery condition can be checked on meter)
Construction:
Cast and drawn aluminum with beige powder coating
Connector:
Series "C" (others available)
Size (H x W x L):
24.1 x 8.9 x 21.6 cm (9.5 x 3.5 x 8.5 in.) with handle
Weight:
2.5 kg (5.6 lb) including batteries and detector
