The GammaRAE II R is a gamma radiation detector and full-range dosimeter in a single instrument.

GammaRAE II R is specifically designed to meet the needs of emergency crews and first responders, it has the rapid response of a detector and the accurate dose measurement of a dosimeter in one instrument.

  • Sensitive Csl scintillator for fast search capability and response
  • Energy-compensated PIN diode sensor for high dose rate range and accurate dosimeter capabilities
  • Prominent visible, audible and vibration alarms
  • Immersible in water for easy decontamination
  • Top-mounted, invertibledisplay
  • Continuous digital readout in Sievert/hour and countsper-second


Radiation Sensors 3cc CsI (TI) with Photodiode (Low channel) Energy-Compensated PIN Diode (High channel)
Energy Range 0.06 to 3.0 MeV
Dose Equivalent Rate (DER) Range for 137Cs 1 μR/h to 600 R/h (0.01 μSv/h to 6 Sv/h)
Accuracy of DER ±20%
Dosage Range 1 μR to 999.9 R (0.01 μSv to 9.9 Sv)
Background Reference Background level reference set automatically on start-up (Search Mode only), plus user-initiated as needed
Calibration None required. Periodic functional test recommended using 1 μCi and 16 μCi 137Cs check sources. Factory calibration available if needed.



Time to Alarm <2 seconds
  • Loud audible buzzer (85+ dB @ 30 cm)
  • Built-in vibration alarm
  • Highly visible LED lights on both sides of LCD graphic display
Alarm Settings
  • Dose Rate
    • Search Mode: Alarm threshold based on variations in local background level
    • Safety Mode: User-programmable low and high alarm thresholds based on dose rate
  • Dose
    • User-programable low and high alarm thresholds based on dose
    • Stay Time: Alarms vary by time (3 min to 2 hrs, once per minute; <3 min, once every 5 sec; 0 min and beyond, same as dose alarm)

Datalogging and Communication

Datalog Size 30,000 data points (20 days at 60-second intervals)
Datalog Modes Continuous: Logs data at all times
Event-Driven: Starts logging data on alarm
Datalog Interval User programmable, 1 to 3,600 seconds
Communication Built-in Bluetooth® radio interfaces with computer for datalog download and configuration changes



Battery 2 AA alkaline batteries
Operating Period Up to 600 hours


Operating Environment

Temperature -20° C to 50° C (-4° F to 122° F)
Temperature Alarm Temperatures above 50° C (122° F) will cause a high-temperature error message
Humidity 0% to 95% (non-condensing)
Shock Resistance Passes drop test from 1.5 m (59")
IP Rating IP-67 (immersible)
Intrinsic Safety Certified to meet Class I, Div. I, Groups A, B, C, D, T4 ATEX II IG EEx ia IIC T4


Physical Characteristics

Display Graphic LCD with 1.2" x 0.75" (30.5 mm x 19 mm) viewable area can be flipped for view by user; Radiation intensity displayed in cps or dosage rate in divisions of R/h or Sv/h
Direct Readout Dose rate, peak, min, total dose, battery status, time, temperature
Ergonomics Nonslip rubber housing with grippable ridges securely fits hand or glove
Keypad 2 operation/program buttons
Size 4.92" x 2.68" x 1.38" (125 mm x 68 mm x 35 mm)
Weight 9.5 oz (270 g)
Attachments Rugged metal belt clip and wrist strap

*Specifications are subject to change


  • Customs and border patrols
  • Law enforcement
  • Security officers in nuclear power facilities, banks, government laboratories, medical facilities
  • Military
  • Government agencies
  • Fracking
  • Hazmat Response
  • HazMat teams
  • Fire departments

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