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Monitor 4EC Radiation Detector

Energy‑Compensated Radiation Survey Meter

The Radiation Alert® Monitor 4EC is an ergonomic, energy‑compensated radiation survey meter designed for accurate and reliable radiation monitoring across a wide range of applications. It detects alpha, beta, gamma, and X‑ray radiation over three selectable measurement ranges, providing versatile coverage for general radiation surveys and safety inspections.

Energy‑Compensated, Linear Gamma Response

The Monitor 4EC offers a linear response for gamma and X‑ray radiation above 40 keV, ensuring dependable dose‑rate measurements across varying energy levels. Its energy‑compensated design improves accuracy when monitoring gamma and X‑ray sources, making it suitable for professional radiation safety and compliance use.

Simple, Ergonomic Operation

Built for ease of use, the Monitor 4EC features an ergonomic design with clear, intuitive feedback. A red count indicator light flashes and an audible beep sounds with each detected event, providing immediate visual and audible confirmation of radiation levels during surveys.

Applications & Uses

Checking accelerator & x-ray shielding for leakage, Checking industrial gauges, such as moisture, density, or level gauges containing Cesium-137, Locating sources, Personal protection, General surveying

Analog Radiation Detector Comparison

Specifications

Detector

Halogen-quenched GM tube, energy compensated sidewall 2mm thin filter. 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). 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 (non-compensated), 40 keV through the sidewall.

Accuracy

Reference to Cs137
Typically ±15% from factory, ±10% with NIST Source Calibration NIST Calibration Additional

Range Switch

X1, X10, X100, Battery Check.

Display

Analog Meter holds full scale in fields as high as 100X maximum reading. CPM & mR/hr scale. Optional SI Scale Meter Available

 Optional meter scales

Audio Indicator

Internally mounted beeper (can be turned off for silent operation).

Outputs

3.5 mm jack with pulse out.

Power Requirements

9-volt alkaline battery (included). Approx. 2,000 hrs. at normal background

Temperature Range

-10° to +50°C (14° to 122°F)

Humidity

10% to 70% Non-Condensing.

Weight

M4: 200 g (7.1 oz) M4EC: 224 g (7.9 oz)

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

Limited Warranty

1 year limited warranty

Included with Monitor 4 EC

Radiation Alert® Carrying Cases

Radiation Alert® Carrying Cases





What Our Clients Say

“

Ron Ulbrich, Geiger Counter Pro

“The Radiation Alert Ranger® is a great value for those looking for a modern Geiger counter. I found that is simple to use yet includes many advanced functions if and when you want them without obstructing the simplicity…”

“

Judson Kenoyer, CHP, CIH

“I have used the Monitor 4 in courses that I teach radiation safety for close to 8 years. The students love it and affectionately call it the “Batman unit” because of its use in the movie The Dark Knight Rises. It is light-weight, sensitive, and quite often out performs some of the more expensive units from other companies that we use in a lab exercise…”

“

Neil Breslow, NDT Supply

“NDT Supply has been working with SE International since we started business in 2000. We have found them to be easy to work with, and a very reliable and responsive supplier. Questions and issues are always handled promptly and with a smile…”