Radiation Alert® Ranger
Radiation Alert® Ranger
Radiation Alert® Ranger
Radiation Alert® Ranger
Radiation Alert® Ranger
Radiation Alert® Ranger
Radiation Alert® Ranger
Radiation Alert® Ranger
Radiation Alert® Ranger
Radiation Alert® Ranger
Radiation Alert® Ranger
Radiation Alert® Ranger
Radiation Alert® Ranger
Radiation Alert® Ranger
Radiation Alert® Ranger

Radiation Alert Ranger

The Radiation Alert Ranger® offers maximum performance in a lightweight, rugged nuclear radiation detector for surveying at the facility or in the field. Though designed with industrial environments in mind, it still has all of the features you’ve come to love in the lab. The Radiation Alert Ranger® is a small, handheld, digital survey meter that offers excellent sensitivity to low levels of alpha, beta, gamma, and x-rays.

This model has built in efficiencies for common isotopes to calculate activity in Bq and DPM. This Ranger radiation detector also 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.

Free Observer USB Software
Free Observer BLE Software For Use With The
Optional Bluetooth Module

Internal memory and the free Observer USB Software (Windows® only) allow you to download your data, and set computer alarms. With the optional Blue Tooth module you can download Free Radiation Alert® Observer BLE app from the Google App Store, where you can display the readings from your detector on your android device, label sample readings and descriptions, take timed counts, append GPS data and send your saved survey file. Alarms set on the instrument will also activate on your android device.

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

Helpful Videos
Radiation Alert Ranger® - Radiation Detector-Taking a Timed Count

Radiation Alert Ranger® Radiation Detector- Setting the Alarm

Radiation Alert Ranger® Radiation Detector- Backlight

Radiation Alert Ranger® Radiation Detector- Silent Operation

Contact For Pricing and Availability




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

Ranger front and back

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.

Ranger, Ranger EXP, & Frisker Energy Response

Built-in Efficiencies

Sulfur (35S), Strontium (90Sr/y), Cesium (137Cs), Phosphorus (32P), Carbon (14C), Iodine (131I), Cobalt (60Co), and Alpha


Graphic LCD with Backlight

Anti Saturation

Meter will hold at OVER RANGE in fields as high as 100 times the maximum reading.

Averaging Periods

This radiation detector 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.

Included with Ranger

Option Carry Case                 Stand  
Carrying Case Stand  
Observer BLE  Observer Software  
Observer BLE Software for Android Observer USB Software  
Extreme Boot Ranger back with tube cap   
Extreme Boot Ranger with Tube Cap   



USB for use with Free Observer USB Software for PCs Bluetooth Option additional: Wirelessly connects the instrument with an Android mobile device for use with Free Observer BLE App


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.


Reference to Cs137
Typically ±15% from factory, ±10% with NIST Source Calibration NIST Calibration Additional

Selectable Alert Settings

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.

Temperature Range

-10° to +50°C (14° to 122°F)


10% to 70% Non-Condensing.


140 X 68 X 33 mm (5.5 X 2.7 X 1.3 in.)


291g (0.64 lbs.)


Carrying Case, Xtreme Boot, Lanyard, Stand, Batteries, Mini-USB Cable, Observer USB Software, Observer BLE Software, Certificate of Conformance


Wipe Test Plate, Swipes, Water Resistance Case, NIST Calibration
Bluetooth module available for use with Observer BLE APP and Rad Responder

Limited Warranty

1 year limited warranty


Ranger Options

 WipeTest Plate Swipes      Water reisitant case
WipeTest Plate Swipes Protective Water-Resistant case
Rad Respinse Kit    
Radiation Response Kit