R500 - 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.

R500 Handheld Radionuclide Identification Device features

  • 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

R500 neutron detection

Helium-3 neutron counters are detectors that are sensitive to thermal (slow) neutrons. As an option, in addition to the specific gamma radiation detector material used, identiFINDER R500 can also be equipped with He-3 counters to measure thermal neutrons. 


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


12-channel SiRF III receiver


nternal Source *(A, B)

137Cs; 25 nCi (925 Bq)

Internal Source *(C, D)

54Mn; 80 nCi (2960 Bq)


Energy Range (Gamma)

20 keV – 3 MeV


200 kcps

Max. Input Count Rate

300 kcps

Sensitivity (137Cs)

2900 cps per µSv/h


Real-time linearization of gamma spectrum

Gamma Spectrum

1024 channels; 3 MeV

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 %


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



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



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



FLIR powerPACK ultra 2 (LSD NiMH, rechargeable)


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



Transflective color LCD


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


Gamma alarm

Orange LED

Charging batteries

Green LED

External power


Alarm reporting


Keyboard feedback and alarm reporting


Data Storage Capacity

2 GB internal memory; 1800 MB available for the user

Identifications incl. Spectrum


Data Logging Every 5 s *(A, C)

≈5 years

Data Logging Every 5 s *(B, D)

≈2.5 years







USB 2.0; mini-B socket


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


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

Carrying Case


Replacement Battery

FLIR powerPACK 2 for 4 AA batteries

Connection Cable

Mini USB-B – USB-A


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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