The Ranger offers maximum performance in a lightweight, rugged solution for surveying at the facility or in the field. The Ranger has been designed for
industrial environments, but it still has all of the features you’ve come to love
in the lab. The Ranger is a small, handheld, microprocessor-based instrument
which offers excellent sensitivity to low levels of alpha, beta, gamma, and
x-rays and 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, set computer alarms, and calibrate your instrument!
Ranger Quick Specs PDF
DetectorInternal 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 RangemR/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
Accuracy (Referenced to Cs137)
Typically ±15% from factory, ±10% with NIST Source Calibration
Energy SensitivityDetects 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.
Built-In EfficienciesSulfur (35S), Strontium (90Sr/y), Cesium (137Cs), Phosphorus (32P), Carbon (14C), Iodine (131I), Cobalt (60Co), and Alpha
Selectable Alert Set RangemR/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-SaturationMeter will hold at OVER RANGE in fields as high as 100 times the maximum reading.
Averaging PeriodsDisplay 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.
DisplayGraphic Display with Backlight
Count LightRed LED flashes with each radiation event
Audio IndicatorInternally mounted beeper (can be switched off for silent operation)
OutputsUSB for use with Free Observer USB Software for PCs
Power RequirementsTwo AA alkaline batteries (included)
Size140 X 68 X 33 mm (5.5 X 2.7 X 1.3 in.)
IncludesCarrying Case, Xtreme Boot, Lanyard, Stand, Mini-USB Cable, Observer USB Software Download, Certificate of Conformance
OptionsWipe Test Plate, Swipes, NIST Calibration
1 year limited warranty
|a ß y x|
|Included Protective Boot|
|Built-In Isotope Efficiences|
|GM Detector||Internal||Internal||External (EXP)|
|mR/hr||.001(1µR) to 200||.001(1µR) to 100|
|µSv/hr||- .01 to 2000||.01 to 1000|
|Counts Per Minute||0 to 214,000||0 to 350,000|
|Counts per Second||0 to 3575||0 to 5000|
|Total Timed Counts||1 to 9,999,000|