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Detector: Halogen-quenched uncompensated GM tube with thin mica window 1.5-2.0 mg/cm2 thick.
Operating Range
0-.5, 0-5, 0-50 mR/hr
0-500, 0-5,000, 0-50,000 CPM or
0-5, 0-50, 0-500 µSv/hr (SI Scale Meter Option)
Accuracy: Typically ±15% of reading (Cs137)
Energy Sensitivity
1000 CPM/mR/hr (Cs137). Detects alpha down to 2.5 MeV; typical detection efficiency at 3.6 MeV is greater than 80%. Detects beta at 50 keV with typical 35% detection efficiency and beta at 150 keV with typical
75% detection efficiency. Detects gamma and x-rays down to 10 keV typical through the window, 40 keV minimum through the case.
4EC is the same as M4 except the energy response for gamma and x-rays through the detector sidewall is flat within +61% or -26% over the range of 40 keV to 100 keV, and within +35% or -17% over the range of 100 keV to 1.3 MeV.
Display
Analog Meter holds full scale in fields as high as 100X maximum reading. CPM & mR/hr scale.
Optional SI Scale Meter AvailableAudio Indicator
Internally mounted beeper
Power Requirements: 9-volt alkaline approx. to 2,000 hrs at background
Temperature Range: -20° to 55°C (-4° to 131°F).
Weight: 200 g (7.1 oz)
Outputs
Headphone 3.5mm jack to count to computer or
datalogger. Size
209 x 71 x 50 mm (8.2 x 2.8 x 1.9 in.)
Includes
Carrying Case w/ Belt Clip
Options
SI Meter Option, Observer Software,
NIST Calibration
