Next Generation Handheld Radionuclide Identification Device

The identiFINDER R500 (formerly the radHUNTER™) is an extremely sensitive and accurate digital hand-held gamma radionuclide identification device (RIID).

Available in two configurations (NaI and LaBr), the R500 is able to quickly detect, rapidly locate, accurately measure and precisely identify sources of contamination from their gamma radiation signature.

The R500 NGH uses a 0.75" thick by 4" diameter NaI(Tl) detector while the R500 LGH ultra 3n uses a 1.5" by 1.5" LaBr3:(Ce) detector. Both instruments come with a GM tube for high gamma dose rate measurements and a sealed He3 detector with moderator for neutron detection. Each instrument is supplied in a carrying case with battery charger, communication cables, synchronization and analysis software.

Variations in normal operating conditions can affect the performance of RID with scintillation detectors such as NaI(Tl) and LaBr3:(Ce). Dramatic temperature variations can affect the scintillation detector and/or the PMT and can also cause instabilities and non-linearities in the electronics. In addition, high count rates can impact the peak position in a spectrum. The R500 instruments have been developed to correct all these circumstances through automatic calibration and continuous LED stabilization.

  • Rapidly determine the primary location of the radiation
  • Determine the nuclide identification in as little as a few seconds
  • Alarms on doserate changes above background
  • Continually stabilizes for temperature and other conditional changes
  • Real time visual, audible and tactile alarm annunciators
  • Reach-back via Bluetooth with event data
  • Easy operation with hazmat gloves
  • Radionuclides are labeled as NORM, industrial, medical or SNM
  • Expert mode
  • Gamma spectrometer functions
  • Change settings and operational parameters


Specifications relevant for certain variants only are labeled with the variant.


Gamma NaI *(A, B, C, D) Crystal size 102 mm (4.02 in) × 19 mm (0.75 in)
Gamma LaBr3 *(E) Crystal size 38 mm (1.50 in) × 38 mm (1.50 in)
Neutron 3He Proportional Counter Tube *(B, D, E) 19 mm (0.75 in) × 106.7 mm (4.20 in); net: 18 mm (0.71 in) × 75.7 mm (2.98 in); 8 atm (8.106 bar)
Gamma (High Dose Rate) Geiger-Müller detector
GPS 12-channel SiRF III receiver


Internal Source *(A, B) 137Cs; 25nCi (925Bq)
Internal Source *(C, D) 54Mn; 80nCi (2960Bq)


Energy Range (Gamma) 20keV – 3MeV
Throughput 200 kcps
Max. Input Count Rate 300kcps
Sensitivity (137Cs) 2900 cps per µSv/h
Corrections Real-time linearization of gamma spectrum
Gamma Spectrum 1024channels; 3MeV
Dose Rate Range 0.000 µSv/h – 10.00 mSv/h
dto. Scintillator 0.000 µSv/h – 50 µSv/h
dto. Geiger-Müller Detector 10 µSv/h – 10.00 mSv/h
dto. Overload 10 mSv/h – 100 mSv/h
Dose Range 0.000 µSv – 1 Sv
Neutron Sensitivity *(B, D, E) 9 cps/nv ±15 %
Stabilization Calibration source; LED; ±1 % for temperature change rate of
Nuclide Identification According to ANSI N42.34
Typical Resolution *(A, B, C, D) 8 % FWHM at 662 keV at 20 °C (68 °F) ambient temperature
Typical Resolution *(E) 3.5 % FWHM at 662 keV at 20 °C (68 °F) ambient temperature


Recommended Interval 5a


Dimensions (W × D × H) 129 mm (5.08 in) × 212 mm (8.35 in) × 323 mm (12.72 in)
Weight *(A, B, C, D) 2900 g (102.29 oz) including batteries
Weight *(E) 2460 g (86.77 oz) including batteries
Housing Material Aluminium


Operating Temperature -20 °C – +55 °C (-4 °F – +131 °F)
Storage Temperature +10 °C – +35 °C (+50 °F – +95 °F)
Temperature Change Sudden temperature change must not exceed 30.0 °C (54.0 °F) in order to avoid damage to the detector crystal
Relative Humidity 10 % – 80 %, non condensing
Shock Resistance According to ANSI N42.34
Protection Rating IP54 according to IEC 60529


Type FLIR powerPACK ultra 2 (LSD NiMH, rechargeable)
Capacity 2500 mAh; 4.8 V
Operating Duration ≥8 h at 20 °C (68 °F) in dose rate mode with dimmed display back light and GPS switched off
Charging Duration ≤4 h at 20 °C (68 °F) when instrument off and connected to DC power charger and >4 h when powered via USB.
Quiescent Current 16.5 µA typically


Type Transflective color LCD
Size 68.4 mm (2.69 in); 320 pixel × 240 pixel
Central Luminance 400 cd/m² typically


Blue LED *(B, D, E) Neutron detection and alarm
Red LED Gamma alarm
Orange LED Charging batteries
Green LED External power
Vibrator Alarm reporting
Beeper Keyboard feedback and alarm reporting


Data Storage Capacity 2 GB internal memory; 1800 MB available for the user
Identifications incl. Spectrum ≈600000
Data Logging Every 5 s *(A, C) ≈5 years
Data Logging Every 5 s *(B, D) ≈2.5years
Screenshots ≈2500
Alarms ≈1000000


USB USB 2.0; mini-B socket
Bluetooth Class 2.0; ≤10 m (32.81 ft) range


Embedded Software Microsoft Windows CE Operating System
Web Interface TCP/IP emulated via USB
Download File Formats ANSI N42.42 and spc files compatible with third-party analysis software applications such as GADRAS, Cambio, or PeakEasy
Reachback ANSI N42.42 data via Bluetooth to DUN compatible cell phone
STRIDE Data Protocol STRIDE Data Protocol for network integration


DC Power Adapter, Charger AC in: 110 V – 230 V; 50 Hz – 60 Hz; DC out: 5 V; 2 A
Replacement Battery FLIR powerPACK 2 for 4 AA batteries
Connection Cable Micro USB-B – USB-A
Carrying Case Included


ANSI N42.34 Performance Criteria for Hand-Held Instruments for the Detection and Identification of Radionuclides
IEC 62327 Radiation Protection Instrumentation - Hand-Held instruments for the detection and identification of Radionuclides and for the indication of ambient dose equivalent rate from Photon Radiation
IEC 60529 Degrees of Protection Provided by Enclosures (IP Code)
UL 61010-1, Part 1 Safety Requirements for Electrical Equipment for Measurement, Control, and Laboratory Use, 2005
EMC - Directive 2004/108/EC Regulations concerning electromagnetic compatibility
ANSI N42.42 2006 Data format standard for radiation detectors used for Homeland Security

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