Manufacturer: RAE Systems
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The GammaRAE II R is a gamma radiation detector and full-range dosimeter in a single instrument. Designed specifically to meet the needs of first responders, it has the rapid response of a detector and the accurate dose measurement of a dosimeter.

Key Features

  • Sensitive CsI scintillator for excellent search capability and fast response
  • Energy-compensated PIN diode sensor for high dose rate range and accurate dosimeter capabilities
  • Prominent visible, audible and vibration alarms
  • Alerts first responders to radioactive threats
  • Accurately measures accumulated dose to the wearer
  • Immersible in water for easy decontamination
  • Top-mounted, invertable display
  • Continuous digital readout in Rem/hour (μR/h & mR/h) or in Sievert/hour (μSv/h & mSv/h) and counts per second (cps)
  • Two operation keys, simple intuitive programming
  • Long calibration life
  • Two AA Alkaline batteries last up to 600 hours
  • Large, 30,000-point datalog capacity, downloaded via cable-free Bluetooth® connection


  • 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
  • Alarms
    • 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


  • 2 AA alkaline batteries

Operating Period

  • Up to 600 hours


  • -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


  • 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


  • 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


  • Nonslip rubber housing with grippable ridges securely fits hand or glove


  • 2 operation/program buttons


  • 4.92" x 2.68" x 1.38" (125 mm x 68 mm x 35 mm)


  • 9.5 oz (270 g)


  • 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
  • HazMat teams
  • Fire departments