NM01MONITOR4

The Radiation Alert® Monitor 4 is a compact, analog radiation detector designed for versatility and reliability. This general-purpose survey meter can detect alpha, beta, gamma, and X-ray radiation across three selectable ranges. With decades of proven performance in the industry, the Monitor 4 has become one of the leading analog radiation detectors available today. Its simple, ergonomic design features a red count light that flashes and an audible beep for each detected count. A quick flick of your thumb allows for an easy battery check and silent operation.

The S.E. International (SE INTL) General Purpose Survey Meter is a versatile and robust handheld radiation detector designed for broad-spectrum radiation measurement. It is widely recognized for its ability to detect alpha, beta, gamma, and X-ray radiation, making it an indispensable tool for a variety of applications from environmental monitoring to industrial safety and educational purposes.

Key Features & Benefits:

• Multi-Radiation Detection Capability:

  • Alpha, Beta, Gamma, and X-ray detection: This comprehensive capability is provided by its specialized detector.

  • Thin Mica Window (1.5-2.0 mg/cm² thick): This extremely thin window is crucial for allowing low-energy alpha particles and weak beta particles to penetrate the detector, enabling their measurement. It also provides good response to low-energy gamma and X-rays.

• Halogen-Quenched Uncompensated GM Tube:

  • Geiger-Müller (GM) Tube: The core detection element, known for its sensitivity and reliability in detecting individual radiation events.

  • Halogen-Quenched: Ensures a stable and long-lasting operation of the GM tube by self-quenching the discharge within the tube.

  • Uncompensated: While highly sensitive, an uncompensated GM tube's energy response for gamma and X-rays is not flat (it typically over-responds at lower energies). Users should be aware of this characteristic when interpreting dose rate measurements for mixed energy fields.

• Multiple Selectable Ranges: The meter offers 3 selectable ranges, allowing it to measure a wide spectrum of radiation levels, from background radiation to significantly elevated contamination or dose rates.

• Dual Unit Display (µSv/hr and mR/hr Scales): Provides dose rate readings in both microSieverts per hour (µSv/hr), the international standard unit, and milliRoentgens per hour (mR/hr), a commonly used unit in the United States. This dual scaling simplifies interpretation and compliance with various regulatory frameworks. Many models also display Counts Per Minute (CPM).

• Audible and Visual Indication: Typically includes an audible "click" per count and a red LED indicator to give immediate feedback on detected radiation levels.

• Robust and Portable Design: Built for field use, these meters are generally compact, lightweight, and durable, often featuring ruggedized housings that can withstand typical industrial environments.

• S.E. International Quality: Manufactured by S.E. International, Inc., a reputable company known for producing reliable and user-friendly radiation detection instruments.

Specifications (Typical for S.E. International Inspector or Inspector EXP/Alert models):

• Manufacturer: S.E. International, Inc.

• Model: Commonly models like "Inspector," "Inspector EXP," or "Inspector Alert" fit this description.

• Detector Type: Halogen-quenched uncompensated Geiger-Müller (GM) tube

• Window Thickness: 1.5-2.0 mg/cm² mica window

• Radiation Detected: Alpha, Beta, Gamma, X-rays

• Energy Sensitivity:

  • Gamma/X-ray: Down to 10 keV (typically detects 0.01 to 1000 µSv/hr / 0.001 to 100 mR/hr for gamma and X-rays from 0.01 to 1000 µSv/hr).

  • Alpha: Detects alpha down to 2.5 MeV

  • Beta: Detects beta down to 0.15 MeV

• Ranges/Units:

  • 0.001 to 100 mR/hr

  • 0.01 to 1000 µSv/hr

  • 0 to 350,000 CPM (Counts Per Minute)

• Accuracy: ±10% typical (NIST traceable)

• Display: LCD digital display with selectable units.

• Power Source: Typically a single 9-volt alkaline battery (common for these models).

• Battery Life: Approx. 200 hours at normal background levels.

• Dimensions: Approx. 150×80×30mm (6×3.2×1.2inches)

• Weight: Approx. 220g (7.8oz) without battery.

Typical Applications:

• Environmental Monitoring: Assessing background radiation levels, checking for radioactive contamination.

• Industrial Safety: Radiation safety checks in laboratories, industrial facilities (e.g., NDT, mining, oil & gas), and manufacturing plants.

• Educational Settings: Demonstrating principles of radioactivity and radiation detection.

• Emergency Response: Initial assessment of radiation hazards.

• Homeland Security: Screening for illicit radioactive materials.

• Scrap Metal Recycling: Screening materials for radioactive contamination.