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Detector: Halogen-quenched GM tube with thin mica end window. Mica window density 1.5-2.0 mg/cm2. Effective window diameter is .360 inch. Side wall is .012 inch thick.
Operating Range
mR/hr – .001 (1µR) to 200 mR/hr
µSv/hr – .01 to 2000
CPM – 0 to 235,400
CPS – 0 to 3923
Total Counts – 1 to 9,999,000 counts
Energy Sensitivity
1070 CPM/mR/hr referenced to 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.
Detects beta at 150 keV with typical 75% detection efficiency.
Detects gamma and x-rays down to 10 keV typical through the window, 40 keV minimum through the case.
(Ref to Cs137)
Accuracy of Radiation Detector Device
Referenced to Cs137
Typically ±15% from factory, ±10% with NIST Source Calibration.
Anti-Saturation: Readout will OVERRANGE in radiation fields as high as 100 times the maximum reading.
Selectable Alert Set Range: mR/hr .001 – 100 and CPM 1 – 350,000. Pulsating beeper sounds the alert. Adjustable alert levels are used for mR/hr / CPM, and µSv/hr / CPS. 70db @ 1m. Alarm will sound when in Timer Mode when set alarm threshold is reached.
Display: Graphic LCD with Backlight.
Outputs
USB for use with Free Observer USB Software for PCs
Bluetooth Option Additoinal: Wirelessly connects the instrument with an Android mobile device for use with Free Observer BLE App
Count Light: Red LED flashes with each count.
Audio Indicator: Sounds with each count (can be switched off for silent operation)
Power Requirements: USB Power or Two (2) AA alkaline batteries (included). Approx. 800 hrs @ background.
Temperature Range: -10° to +50°C (14° to 122°F)
Humidity: 10% to 70% Non-Condensing.
Size: 140 X 68 X 33 mm (5.5 X 2.7 X 1.3 in.)
Weight: 181 g (0.4 lbs.)
Includes
Carrying Case, Xtreme Boot, Lanyard, Stand, Batteries, Mini-USB Cable, Observer USB Software Download, Observer BLE App, Certificate of Conformance
Bluetooth module available for use with Observer BLE APP and Rad Responder
Options: Water Resistant Case , NIST Calibration
