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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.).
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)
X1, X10, X100, Battery Check.
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
Reference to Cs137
Typically ±15% from factory, ±10% with NIST Source Calibration NIST Calibration Additional
Analog Meter holds full scale in fields as high as 100X maximum reading. CPM & mR/hr scale. Optional SI Scale Meter Available
Internally mounted beeper (can be turned off for silent operation).
3.5 mm jack with pulse out
9-volt alkaline battery (included). Approx. 2,000 hrs. at normal background
-10° to +50°C (14° to 122°F)
10% to 70% Non-Condensing
M4: 200 g (7.1 oz) M4EC: 224 g (7.9 oz)
209 x 71 x 50 mm (8.2 x 2.8 x 1.9 in.)
Carrying Case w/ Belt Clip
4-digit liquid crystal display with mode indicators
±10% typical; ±15% maximum
No Alert feature. If your intended application requires a user-adjustable Alert, we recommend the Radalert® 100X
Beeper chirps for each count (can be muted)
Cesium 137 (gamma)
CE Certified, RoHS Compliant, and Meets WEEE standards
Red LED flashes with each count
Designed and Manufactured in USA by IMI International Medcom, Inc.
µSv/hr: .000-1,100 CPM: 0-350,000
mR/hr: .000-110 CPS: 0-3,500
Total: 0-9,999,000 counts Timer: up to 40 hours
Computer software and cable available
One AA alkaline battery (one 9-volt alkaline battery on some models); average battery life typically exceeds 3600 hours at normal background radiation levels at sea level. Battery life decreases as radiation level rises.
1,000 CPM/mR/hr referenced to Cs-137
150 x 80 x 30 mm (5.9″ x 3.2″ x 1.2″)
225 grams (8 oz) including battery
Internal Halogen-quenched, uncompensated GM tube with thin mica window, 1.4-2.0 mg/cm2 areal density. Effective diameter of window is 45 mm (1.77 in.).
mR/hr – .001 (1µR) to 100
CPM – 0 to 350,000
µSv/hr – .01 to 1000
CPS – 0 to 5000
Total Counts- 1 to 9,999,000 counts
Detects Alpha down to 2 MeV. Detects Beta down to .16 MeV; typical detection efficiency at 1 MeV is approx. 25%. Detects Gamma and X-rays down to 10 KeV through the detector window. 3340 CPM/mR/hr (137Cs). Smallest detectable level for 125I is .02 µCi at contact.
Sulfur (35S), Strontium (90Sr/y), Cesium (137Cs), Phosphorus (32P), Carbon (14C), Iodine (131I), Cobalt (60Co), and Alpha
Graphic LCD with Backlight
Meter will hold at OVER RANGE in fields as high as 100 times the maximum reading.
This radiation detector display updates every 3 seconds. At low background levels, the update is the average for the past 30-second time period. The timed period for the average decreases as the radiation level increases.
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