Monitor 4 Geiger Counter – Assembled – CK0106A
This high-quality Geiger Counter is a compact, analog, ergonomic, general purpose survey meter capable of detecting alpha, beta, gamma, and x-rays over 3 selectable ranges. A red count light flashes and audible beep sounds with rising radiation levels. SE International Monitor 4.
Halogen-quenched uncompensated GM tube with thin mica window 1.5-2.0 mg/cm2 thick.
Effective diameter of window is 9.1 mm (.36 in.).
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)
Energy Sensitivity: 1000 CPM/mR/hr (Cs137). M4EC 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. M4 & M4EC meter scales shown below.
Both Detect beta at 50 keV with typical 35% detection efficiency and beta at 150 keV with typical 75% detection efficiency.
Accuracy: Typically ±15% of reading (Cs137)
Energy Response Curve: Monitor 4: Detects alpha down to 2.5 MeV; typical detection efficiency at 3.6 MeV is greater than 80%. Detects gamma and x-rays down to 10 keV typical through the window, 40 keV minimum through the case.
Range Switch: X1, X10, X100, Battery Check. Meter Face Options
Display: Analog Meter holds full scale in fields as high as 100X maximum reading. CPM & mR/hr scale. Optional SI Scale Meter Available.
Audio Indicator: Internally mounted beeper (can be turned off for silent operation).
Power Requirements: 9-volt alkaline battery. Approx. 2,000 hrs. at normal background
Temperature Range: -20° to 55°C (-4° to 131°F)
Weight: M4: 200 g (7.1 oz)
Outputs: 3.5 mm jack with pulse out.
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, Mini-USB Option w/ USB Observer Software (Call)
Limited Warranty: 1 year limited warranty
Monitor 4 Kits: Build your own Monitor 4! Learn about how a geiger counter works! (Call)
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