Original Monitor 4 & 4EC Handheld Radiation Alert? Detector Discontinued
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The MONITOR 4MONITOR 4EC are compact, general purpose survey meters capable of detecting alpha, beta, gamma,x-rays over 3 selectable ranges. A redlight flashesa beep sounds with each event detected. The Monitor 4EC offers a more accurate linear reading for gammax-rays above 40 keV. ＊Monitor 4 now available in kit form!＊
Specifications
Detector Monitor 4: Halogen-quenched uncompensated GM tube with thin mica window 1.5-2.0 mg/cm2 thick. Monitor 4EC: Halogen-quenched GM tube, energy compensated sidewall 2mm tin filter. Thin mica window 1.5-2.0 mg/cm2 thick. Display Analog Meter Scale. Monitor 4 Energy Sensitivity Detects alpha down to 2.5 MeV; typical detection efficiency at 3.6 MeV is > 80%. Detects beta at 50 keV with typical 35% detection efficiency. Detects beta at 150 keV with 75% typical detection efficiency. Detects gammax-rays down to 10 keV typical through the window, 40 keV minimum through the sidewall of the detector. Normal background is approximay 10-20 CPM.
Gamma Sensitivity:
Operating Range
1000 CPM/mR/hr referenced to Cs-137 Energy Sensitivity for the 4EC is the Same as Monitor 4 except the energy response for gammax-rays through the detector sidewall is flat within +61% or -26% over the range of 40 keV to 100 keV,within +35% or -17% over the range of 100 keV to 1.3 MeV.
0-.5, 0-5, 0-50 mR/hr 0-500, 0-5,000, 0-50,000 CPM or 0-500 ?Sv/hr 0-50 mR/hr. Range Switch X1, X10, X100, Battery Check. Accuracy Typically ±15% of reading referenced to Cs-137
Monitor 4
Monitor 4EC
Audio Internally mounted beeper can be switched off for silent operation. Anti-Saturation Meter will hold at full scale in fields as high as 100 times the maximum reading.
Power Requirements One 9-volt alkaline battery. Battery life is up to 2,000 hours at normal background radiation levels Temperature Range -20° C to 55° C -4° F to 131° F. Weight M4: 178 grams 6.3 oz. without battery 4EC: 198.1 grams 7 oz. without battery Size 145 x 72 x 38 mm 5.7 x 2.8 x 1.5 in. Warranty 1 year limited warranty Monitor 4 Kits Build your own Monitor 4! Learn about how a geiger counter works! Includes: All parts required to build a Monitor 4, AssemblyIllustration booklets.
