The world’s leading, smallest, and lightest handheld radiation detector

The R400 is a logical next generation instrument greatly based on the original identiFINDER. With 15,000+ identiFINDERs deployed worldwide inputs on how to improve this already excellent instrument have been few but valuable. The R400 is the result of taking these inputs and suggestions and adding them to the original instrument. The R400 uses the same algorithms that have proved themselves over many years of superb operation. The housing and three button, one hand operation is also the same. Following is a listing of the features added to make up the R400:

  • Extended 5 year service interval
  • Improved communications with industry standard Bluetooth and USB connections
  • New transflective color display, viewable in all lighting conditions
  • Storage for 600,000 spectra and GPS for location recording
  • No proprietary software used, simplifying customizing instrument settings and downloading industry standard n42.42 files.
  • The R400 is able to rapidly detect, quickly locate, accurately measure and precisely identify gamma emitting radionuclides.

The ability to detect gamma sources as well as the presence of neutrons in the radiation field via an optional neutron detector enhances the identiFINDERs capability.

The standard R400 includes a 1.4” (35 mm) diameter x 2” (51 mm) long NaI (Tl) detector plus a GM tube for high gamma dose rate measurements. Instruments are supplied with a carrying holster plus a wrist strap, serial cable, battery pack for rechargeable and non-rechargeable batteries, charging unit and a carrying case with shoulder strap. An optional, sealed 3He neutron detector can be added for neutron detection. The identiFINDER R400 is also available in fully submersible housing. Variations in operating conditions can affect the performance of radio-isotope identification devices (RIID) with scintillation detectors. Changes in temperatures or high count rates can cause measurements to shift impacting the peak positions and the instrument’s ability to ID accurately. The R400 automatically corrects for these changes by calibrating at start up and continuously stabilizing the measure through the use of an small internal source or our patented LED stabilization technique.

identiFINDER R400 benefits

  • Clear and readable display in all light conditions
  • GPS provides accurate location information
  • Reachback feature provides convenient access to gamma spectroscpist
  • Web interface eliminates the need of a dedicated set-up software allowing you to configure and download data over a standard web browser.
  • Designed to meet ANSI N42.34
  • Detects, locates, measures and identifies radionuclides
  • Automatic calibration and continuous stabilization
  • Digital signal processing enhances data throughput
  • Easy, three button, one hand operation
  • Visible, audible and tactile alarms
  • Accurate Isotope ID based on template matching technique

identiFINDER R400 applications

  • Customs / Border Security
  • First Responders
  • Civil Defense
  • Military / Law Enforcement
  • Nuclear Fuel Cycle/ Environmental
  • Steel / Scrap Metal Certification
  • Nuclear Medicine

R400 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 R400 can also be equipped with He-3 counters to measure thermal neutrons. 


Gamma NaI *(A, B, C, D, E, F, G, H, I, J, K, M)

Crystal size 35mm (1.38in) × 51mm (2.01in)

Gamma NaI *(L)

Crystal size 23mm (0.91in) × 21mm (0.83in); tungsten shielded

Neutron 3He Proportional Counter Tube *(B, D, F, I, K)

15mm (0.59in) × 54mm (2.13in); net: 14mm (0.55in) × 29mm (1.14in); 8atm (8.106bar)

Gamma (High Dose Rate)

Geiger-Müller detector


12-channel SiRF III receiver


Internal Source *(A, B, H, I, L)

137Cs; 15nCi (555Bq); Startup time: ≈60s

Internal Source *(C, D, J, K)

137Cs; 3nCi (111Bq); Startup time: ≈200s

External Source *(E, F, G, M)

40K; Startup time: ≈320s


Energy Range (Gamma)

20keV – 3MeV



Max. Input Count Rate


Sensitivity (137Cs)

>500cps per µSv/h


Real-time linearization of gamma spectrum

Gamma Spectrum

1024channels; 3MeV

Dose Rate Range

0.000µSv/h – 10.00mSv/h

dto. Scintillator

0.000µSv/h – 500µSv/h

dto. Geiger-Müller Detector

100µSv/h – 10mSv/h

dto. Overload

10mSv/h – 1Sv/h

Dose Range

0.000µSv – 1Sv

Neutron Sensitivity *(B, D, F)


Stabilization *(A, B, H, I)

Calibration source; ±1% for temperature change rate of

Stabilization *(C, D, J, K, L)

Calibration source; LED; ±1% for temperature change rate of

Stabilization *(E, F, G, M)

LED; ±1% for temperature change rate of

Nuclide Identification

According to ANSI N42.34

Typical Resolution *(A, B, C, D, E, F, G, H, I, J, K, L, M)

≤8% FWHM at 662keV at 20°C (68°F) ambient temperature

Typical Resolution *(N)

≤6% FWHM at 662keV at 20°C (68°F) ambient temperature

Nuclide Library *(A, B, C, D, E, F, H, I, J, K, L, N)

Standard library

Nuclide Library *(G, M)

Environmental library


Recommended Interval



Dimensions (W × D × H) *(A, B, C, D, E, F, G, L)

248mm (9.76in) × 93mm (3.66in) × 75mm (2.95in)

Dimensions (W × D × H) *(H, I, J, K, M)

270mm (10.63in) × 93.5mm (3.68in) × 82mm (3.23in)

Weight *(A, C, E, G)

1180g (41.62oz) including batteries

Weight *(B, D, F)

1200g (42.33oz) including batteries

Weight *(H, J, M)

1360g (47.97oz) including batteries

Weight *(I, K)

1380g (48.68oz) including batteries

Weight *(L)

1450g (51.15oz) 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 *(A, B, C, D, E, F, G, L, N)

10% – 80%, non condensing

Shock Resistance

According to ANSI N42.34

Protection Rating *(A, B, C, D, E, F, G, L, N)

IP53 according to IEC 60529; (with rubber cover mounted on socket)

Protection Rating *(H, I, J, K, M)

IP68 according to IEC 60529; 10m (32.81ft); 8h



FLIR powerPACK ultra 2 (LSD NiMH, rechargeable)


>2000mAh; 4.8V

Operating Duration

≥8h at 20°C (68°F) in dose rate mode with dimmed display back light and GPS switched off

Charging Duration

≤4h at 20°C (68°F) when instrument off and connected to DC power charger and >4h when powered via USB.

Quiescent Current

16.5µA typically



Transflective color LCD


68.4mm (2.69in); 320pixel × 240pixel

Central Luminance

400cd/m² typically


Blue LED *(B, D, F, I, K)

Neutron detection and alarm


Gamma alarm

Amber LED

Charging batteries

Green LED

External power


Alarm reporting


Keyboard feedback and alarm reporting


Data Storage Capacity

2GB internal memory; 1800MB available for the user

Identifications incl. Spectrum


Data Logging Every 5s *(A, C, E, G, H, J, L, M)


Data Logging Every 5s *(B, D, F, I, K, N)







USB *(A, B, C, D, E, F, G, L, N)

USB 2.0; micro-B socket

USB *(H, I, J, K, M)

USB 2.0; LEMO Series K socket with bung


Class 2.0; ≤10m (32.81ft) 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: 110V – 230V; 50Hz – 60Hz; DC out: 5V; 2A

Replacement Battery

FLIR powerPACK 2 for 4 AA batteries

Connection Cable *(A, B, C, D, E, F, G, L, N)

Micro USB-B – USB-A

Connection Cable *(H, I, J, K, M)

LEMO Series K connector – USB A

Holster *(A, B, C, D, E, F, G, L, N)

210g (7.41oz)

Holster *(H, I, J, K, M)

220g (7.76oz)

Carrying Case


40K Source *(E, F, G, M)

Box with potassium chloride (KCl)

Environmental Kit *(G)

Smear pad holder; smear pads; disposable gloves; report stationery pad


ANSI N42.34

Performance Criteria for Hand-Held Instruments for the Detection and Identification of Radionuclides

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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