This model has built in efficiencies for common isotopes to calculate activity in Bq and DPM. It has a backlit digital display, a red count light, and a beeper that sounds with each count detected. Other features include selectable alert levels, an adjustable timer, and an optional wipe test plate for swipes. Internal memory and the free Observer USB Software allow you to download your data, and set computer alarms.
Applications & Uses: Surveying for NORM (Naturally Occurring Radioactive Material) contamination, Gross wipe counting, Contamination surveys of packages, equipment, people, etc., Regulatory inspections, Scrap Metal Screening, Low energy radionuclide detection
Detector
Internal Halogen-quenched, uncompensated GM tube with thin mica window, 1.4-2.0 mg/cm2 areal density. Effective diameter of window is 45 mm (1.77 in.).
Operating Range
- mR/hr – .001 (1µR) to 100
- CPM – 0 to 350,000
- µSv/hr – .01 to 1000
- CPS – 0 to 5000
- Total Counts- 1 to 9,999,000 counts
Energy Sensitivity
Detects Alpha down to 2 MeV. Detects Beta down to .16 MeV; typical detection efficiency at 1 MeV is approx. 25%. Detects Gamma down to 10 KeV through the detector window. 3340 CPM/mR/hr (137Cs). Smallest detectable level for 125I is .02 µCi at contact.
Accuracy
Reference to Cs137
Typically ±15% from factory, ±10% with NIST Source Calibration NIST Calibration Additional
Built-In Efficiencies
Sulfur (35S), Strontium (90Sr/y), Cesium (137Cs), Phosphorus (32P), Carbon (14C), Iodine (131I), Cobalt (60Co), and Alpha
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.
Anti-Saturation
Meter will hold at OVER RANGE in fields as high as 100 times the maximum reading.
Averaging Periods
Display updates every 3 seconds. At low background levels, the update is the average for the past 30-second time period. The timed period for the average decreases as the radiation level increases.
USB for use with Free Observer USB Software for PCs
Bluetooth for use with the Observer BLE App
| Display | : | Graphic Display with Backlight |
| Includes | : | Carrying Case, Xtreme Boot, Lanyard, Stand, Batteries, Mini-USB Cable, Observer USB Software , Certificate of Conformance |
| Count Light | : | Red LED flashes with each radiation event |
| Audio Indicator | : | Internally mounted beeper (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) |
| Size | : | 140 X 68 X 33 mm (5.5 X 2.7 X 1.3 in.) |
| Weight | : | 291g (0.64 lbs.) |
| Options | : | Wipe Test Plate, Swipes, NIST Calibration |
| Limited Warranty | : | 1 year limited warranty |
