SE International Radiation Alert Ranger Radiation Meter (001 (1µR) to 100)

Detector: Internal halogen-quenched, uncompensated GM tube with thin mica window, 1.4 – 2.0 mg/cm² areal density; Effective window diameter: 45 mm (1.77 in.)

Operating Range:

mR/hr: 0.001 (1 µR) to 100

CPM: 0 to 350,000

µSv/hr: 0.01 to 1000

CPS: 0 to 5000

Total / Timer: 1 to 9,999,000 counts

Energy Sensitivity: 3340 CPM/mR/hr (referenced to Cs137)

Detects Alpha down to 2 MeV

Detects Beta down to 0.16 MeV; typical efficiency at 1 MeV ~25%

Detects Gamma down to 10 keV through the window

Minimum detectable level for I125: 0.02 µCi (at contact)

Accuracy: (Referenced to Cs137) ±15% (factory); ±10% with NIST source calibration

Anti-Saturation: Meter holds at full scale in radiation fields up to 100 times the maximum reading

Averaging Periods:

Display updates every 3 seconds

At low background levels: moving average over 30 seconds

Averaging period decreases as radiation level increases

Display & Alarm

Display: Graphic LCD with backlight

Count Light: Red LED flashes with each radiation event

Alert Set Range: mR/hr: 0.001 – 100; CPM: 1 – 350,000

Alarm: Internal beeper, 70 dB at 1 m (can be muted)

Outputs: Bluetooth (optional) BLE; USB for use with Observer software

Power Supply: 2 × AA batteries

Size: 140 × 68 × 33 mm