The S.E. International Monitor 4 family of analog radiation detectors are ergonomic, compact, and provide excellent sensitivity and fast response; and they are small enough to can fit inside an average pocket. 3 models: Monitor 4, Monitor 4EC, MC1K.
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The International Monitor 4 Family of analog radiation detectors are ergonomic, compact, and provide excellent sensitivity and fast response; and they are small enough to can fit inside an average pocket. These handheld Geiger counters make spot surveys quicker with audio click and red-light response with every count.
There are three models: Monitor 4, Monitor 4EC, and the MC1K.
The M4 and M4EC are compact, ergonomic, general purpose survey meters capable of detecting alpha, beta, gamma, and x-rays over 3 selectable ranges. A red count light flashes and a beep sounds with each event detected. The Monitor 4EC is an energy compensated version and offers a more linear reading for gamma and x-rays (above 40 keV) radiation through the side wall of the detector. The MC1K detects gamma and x-ray, offering a linear response with the energy compensated detector. There is no alpha window on the MC1K and it is an high range analog meter.
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All models include:
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Options for Monitor 4 and Monitor 4EC
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Options for MC1K
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| Monitor 4 |
| Alpha, Beta, Gamma, X-Ray |
| The Monitor 4 is a basic but powerful analog Geiger counter, which reads up to 50 mR per hour. Through the end window it will detect Gamma and X-ray down to 10-12 KeV. It can also (through the end window) detect Alpha and Beta. |
| Monitor 4EC |
| Alpha, Beta, Gamma, X-Ray |
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The Monitor 4EC has an Energy Compensated GM detector (shielding around the tube). Through the end window, the Monitor 4EC detects exactly like the Monitor 4 (the same energy response would be applicable). The Energy Compensated GM detector shields out lower energy Gamma and X-ray giving the user a more linear reading for Gamma and Xray, only above 40kev. For example: This shielding allows the user to point the side wall of the instrument towards the source (i.e. X-ray cabinet) and a more linear reading will be attained (i.e. less needle bouncing) if it is looking through the side wall of an X-ray cabinet. |
| MC1K |
| Gamma, X-Ray |
| The MC1K has no end window. It is an energy compensated detector for Gamma and X-ray only. It reads up to 1000mR./hr. It allows for more linear response to gammas and X-rays over the full range |
| Monitor 4 and Monitor 4EC | MC1K | |
| Applications / Uses | Checking industrial gauges, such as moisture, density, or level gauges containing Cesium-137, Locating Sources, Personal protection, General surveying | Expanded Range up to 1000 mR/hr, Linear Response needs with Energy Compensation, Checking accelerator & x-ray shielding for leakage, Checking industrial gauges; such as moisture, density, or level gauges containing Cesium-137, Locating lost sources, Personal protection, General surveying |
| 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 | Energy compensated halogen-quenched GM tube |
| Energy Sensitivity | 1000 CPM/mR/hr (Cs137). 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 | Detects gamma and x-rays down to 40 keV. Response is flat from 40 keV up |
| 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) |
X1 position 0 – 1 mR/hr or 0 – .01 mSv/hr X10 position 1 – 10 mR/hr or 0 – .1 mSv/hr X100 position 5 – 100 mR/hr or 0 – 1 mSv/hr X1000 position 50 – 1000 mR/hr or 0 – 10 mSv/hr |
| Accuracy | Typically ±15% of reading (Cs137) | Typically ±15% of reading (Cs137) |
| Display | Analog meter holds full scale in fields as high as 100X maximum reading. CPM & mR/hr scale. Optional SI Scale Meter available | 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) | Internally mounted beeper (can be turned off for silent operation) |
| Anti-Saturation | Meter will hold at full scale in fields as high as 100 times the maximum reading | Meter will hold at full scale in fields as high as 100 times the maximum reading |
| Power Requirements | 9-volt alkaline (included) Approx. 2,000 hrs at background | 9-volt alkaline (included) Approx. 2,000 hrs at normal background |
| Temperature Range | -20° to 55°C (-4° to 131°F) | -20° to 55°C (-4° to 131°F) |
| Humidity Range | 10% to 70% Non-Condensing | 10% to 70% Non-Condensing |
| Weight | M4: 200 g (7.1 oz) M4EC: 224 g (7.9 oz) |
217 g (7.7 oz) 3.5 mm headphone jack with pulse out |
| Outputs | Headphone 3.5mm jack to count to computer or datalogger | 3.5 mm headphone jack with pulse out |
| Size | 209 x 71 x 50 mm (8.2 x 2.8 x 1.9 in.) | 209 x 71 x 50 mm (8.2 x 2.8 x 1.9 in.) |
| Includes | Carrying Case with Belt Clip, 9 Volt Battery | Carrying Case with Belt Clip, 9 Volt Battery |
| Options | SI Meter Option (mR/hr with CPM scale, or, mR/hr with uSv/hr scale), Radiation Response Kit, Observer Serial Software, NIST Calibration | Radiation Response Kit , Observer Serial Software, NIST Calibration |
| Warranty | 1 year limited warranty | 1 year limited warranty |
Item #s
| SEI-M4-CPM SEI-M4-uSV SEI-M4EC-CPM |
SEI-M4EC-uSV SEI-MC1K SEI-NISTCAL |
| Monitor 4 and Monitor 4EC Energy Response |
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| M1CK Energy Response |
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Since 1979, S.E. International, Inc., has developed and manufactured product under the Radiation Alert® product name. Their success began with the Monitor 4, a simple but reliable general-purpose survey meter. However, since its introduction they have developed a diverse range of handheld instruments for surface and air contamination. Throughout the years, they maintained a reputation for honesty, innovation, and products that are known for quality and reliability.
S.E. International, Inc. has a strong sense of community and provides development grants and donations to local groups and non-profits, to help strengthen regional initiatives. By supporting local projects, S.E. International, Inc. hopes to inspire other companies to look for creative ways to improve, support, and cooperate with their local communities.
