HAC002B-Ionizing Radiation Detector with External Detector(Geiger Counter)-Alpha, Gamma,Beta Rays Counter

  • Four-digit, LCD display
  • External probe detects low levels of alpha and beta particles, gamma and x-rays for a range of ionizing radiation type detection
  • Red count light and beeper indicate each ionizing radiation change event
  • Comes with a carrying case that provides open access to the display window and operation panel, and has a probe cover that protects the detector, and allows for one-handed operation
1 year limited warranty


This model is a handheld radiation detector that detects potentially harmful ionizing alpha and beta particles, and gamma and x-ray radiation, with an external probe, and has a four-digit, LCD digital display of either millirem (mR) per hour and counts per minute (CPM); or microSieverts (μSv ) per hour and counts per second (CPS), and function indicators, and comes with a carrying case with probe cover. This radiation detector can detect low levels of the four main types of ionizing alpha and beta particles, and gamma rays and x-rays over automatic operational ranges. It is optimized to detect small changes (low levels) in radiation levels and to have high sensitivity to noble gases, and many common low energy radionuclides.

The microprocessor-based Inspector has automatic operational ranges for a variety of radiation detection applications. A red, flashing counter, and a beeping noise indicate each ionizing radiation change event. The display updates every three seconds. At low background levels, which are typical in a geographic area, the update is the moving average for the most recent 30-second time period. The time period for the moving average decreases, as radiation levels increase. It counts ionizing radiation changes, with the user-configured unit of measurement. The display shows various indicators, based on the mode setting, the function performed, and remaining battery power. Depending on user settings, display includes low battery, alert, timer, total mode (to see the number of times a reading should be multiplied by to obtain the correct radiation count), calibration mode, utility menu (timer, calibration, alarm set mode), and units of measurement settings.

The HAC002B Inspector radiation detector comes with a RAP-RS1 external probe with a halogen-quenched, uncompensated Geiger Mueller (GM) tube with a 2” (thin) window for sensing ionizing radiation, and can be used in a variety of applications. The radiation detector is used for surveying naturally occurring radioactive material (NORM) contamination, gross wipe counting, contamination inspection of packages, equipment, and people, regulatory inspections, and for low energy radionuclide detection. This detector has a utility menu on the back of the unit. The menu has a three-second response, and switches the detector from mR/hr and counts per minute (CPM) to μSv/hr and counts per second (CPS). It also can reset the calibration factor to 100, adjust calibration, and reset all settings to the default factory setting. The Inspector EXP radiation detector has an audio indicator with an internally mounted beeper that can be turned off for silent operation. It comes with a carrying case that provides a full view of the display widow and access to controls. The carrying case has hand straps, a belt loop, and probe attachment capabilities to allow for one-handed operation. A reinforced probe cover prevents detector damage.


Reading ranges

.001 (1μR) to 100 mR/hour, 0 to 350,000 CPM, .01 to1,000 μSv/hour, 0 to 5,000 CPS. Total timer 1 to 9,999,000 counts

Energy sensitivity

3340 CPM/mR/hr, referenced to Cesium (Cs) 137. Energy sensitivity detects alpha to 2.0 MeV. It detects beta at 0.16 MeV with typical 25 percent detection efficiency at 1 MeV. It detects gamma to 10 keV through the detector window. Smallest detection level for I-125 is o.02 μCi at contact


MR/hr + or - percent typical (NIST), + or - 15 percent maximum 0 to 100; μSv/hr + or - 10 percent typical (NIST), + or - 15 percent maximum .01 to 1000; CPM + or - 10 percent typical (NIST), + or - 15 percent maximum 0 to 350,000 (referenced to Cs137)

Averaging periods

Display updates every 3 seconds. The update is the moving average for the past 30-second time period at low background levels. The timed period for the moving average decreases as the radiation level increases


RAP-RS1 external probe has anodized aluminum housing with amphenol-Tucal connector and block foam grip handle

Probe dimensions

22.23 x 7.0cm/8.75 x 2.75 inches (H x D)

Manual range switch

Sets at X1, X10, X100, or X1000 to indicate the multiplication factor which determines the complete radiation level


Calibrated electronically using a pulse or function generator. Electronic calibration requires a cable with a 2.5 mm plug, with the tip carrying the signal. Factory default calibration reset option that will automatically reset to auto averaging, mR/hr, CPM, and CAL (calibration) 100

Temperature range

-10 degrees to 50 degrees C (14 degrees to 122 degrees F), and an internal probe

Alert set range

0.001 to 50 mR/hr, and 1 to 160,000 CPM

GM tube

External, halogen-quenched, uncompensated 2-inch GM tube, with an effective window diameter of 1.75” (0.45 mm). Radiation symbol on front label marks the center of the detector

Window thickness

Thin; 1.4 to 2.0 mg/cm2

Normal background radiation

Approximately 10 to 20 CPM. The meter will hold at full-scale in fields as high as 100 times the maximum reading for anti-saturation

Radiation detector dimensions

150 x 80 x 30mm/10.25 x 2.75 x 1.5 inches (H x W x D)


Two 3.5mm headphone jacks can connect to a computer or datalogger, such as complementary metal-oxide semiconductor (CMOS) or transistor-transistor logic (TTL) device. Sub-mini jack input allows for electronic calibration. The probe port located at the end panel attaches the external probe


9V alkaline battery (not included) for approximately 2,160 hours of operation with continuous use in a normal background. Minimum battery life is 625 hours at 1 mR per hour

H is height, the vertical distance from the lowest to highest point; W is width, the horizontal distance from left to right; D is depth, the horizontal distance from front to back.

Radiation detectors can detect a broad range of ionizing alpha and beta particles, and gamma and x-rays that may be emitting harmful levels of radiation. They sense ionizing radiation with an enclosed Geiger Mueller (GM) tube to count radiation particles or rays. Alpha and beta particles are measured in counts per minute (CPM) or counts per second (CPS). Gamma rays and x-rays are measured in milliRoentgens (mR) per hour, microSieverts (μSv) per hour, or milliSieverts (mSv) per hour. Alpha particles are positively charged and heavier than beta particles, and have a limited range of approximately 3 to 5 centimeters by air. Alpha particles can be shielded by objects such as paper and unopened skin. High-energy beta particles are electrons, heavier than gamma rays, and can take either a positive or negative charge. Beta particles can be shielded by aluminum or wood. High-frequency (short wavelength) gamma rays are the strongest and lightest rays. Gamma rays are more penetrating than alpha and beta particles. They can be shielded by dense materials such as lead, and large masses of concrete, hardened steel, or water. X-rays are man-made gamma rays, and have essentially the same properties and function. Radiation detectors commonly have either an analog or a digital display. Analog radiation detectors output with a needle-point scale, and digital units generate a numerical LCD digit display. Radiation detectors are commonly used by hobbyists for safety detection and rock inspection, and professionals in the in the nuclear, medical, mining, instructional, and research industries.

SE International manufactures radiation detection products and accessories under the Radiation Alert brand. The company was founded in 1979 and is headquartered in Summertown, TN.

What’s in the Box?

  • HAC002B radiation detector
  • External probe
  • Instruction manual
  • CE certification



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