A new tool in the fight against nuclear terrorism

More powerful than a RIID, a pocket-sized device that can recognise isotopes and neutrons in seconds.

The new way to protect your city or event from radioactive threat

A radioactive attack could leave thousands dead, whole neighbourhoods uninhabitable and populations traumatised, the effects could last for many years and bring a city to its knees.

This is your new line of defence.

The D3S is a light, wearable Radiation Isotope Detector (RIID) that allows you to identify radioactive threats swiftly, showing the difference between medical and industrial sources and those that are more sinister. It provides a 100-fold increase in the ability to locate and identify sources of radiation at ten times the speed of conventional detectors and one-tenth of the cost. Designed for fast deployment and ease of use, everything you need is in the box.

These small and wearable detectors can go any place a terrorist could also go, they are much harder to avoid because anyone could be carrying one, and they give the user vital information to react appropriately to a threat.

Fast deployment

It takes less than a minute to deploy: take it out of the box, switch it on, put the sensor on your belt, the phone in your pocket, and you are good to go. Using the D3S ID, you can quickly and easily equip anyone to become a radiation detector giving you fast coverage for a location.


  • One of the fastest and most accurate isotope ID devices on the market
  • Discreet, wearable, lightweight
  • A fraction of the size, a fraction of the cost of other RIIDs
  • Rapid, visible, audible and tactile alarm settings
  • Extensively tested and characterised in multiple DNDO and DARPA programs
  • Quick, simple and intuitive to use, no need for specialist training or knowledge

Easy to use

Specifically designed for use by anyone, specialists and nonspecialists alike, with minimal training required. The D3S ID can be used by staff across a wide variety of sectors, including customs and border patrols, police, first-responders, at airports, event security and environmental monitoring.

Far exceeds RIID standards

  • Identifies 17 more isotopes than RIID standard
  • Four times faster than RIID standard
  • Cheaper than standard RIIDs

See the D3S nuclear threat detector in action

Easy to use, easy to deploy, fast to detect and identify

Protecting the USA now

The D3S is deployed in major areas of the US by the US Defense Advanced Research Projects Agency (DARPA) as part of its Sigma programme forming a network of radiation sensors. They have been deployed by the New Jersey Port Authority and field-tested in Washington DC, followed the President to Europe and has been field-tested by other agencies around the world.
Kromek is a qualified contractor under the $8.2bn US Department of Defense Indefinite Delivery Indefinite Quantity (IDIQ) for the Joint Enterprise – Research.

D3S isotope library and performance

  • Library far exceeds ANSI and international standards
  • 37 isotopes – 17 more than ANSI N42.34 standard
  • Discriminates between Medical, NORM, Industrial and SNM classes
  • 69 unique signatures which account for shielding and mixed configurations


  • Americium-241*
  • Indium-111
  • Scandium-46
  • Antimony-124
  • Iodine-123
  • Selenium-75
  • Barium-133*
  • Iodine-131*
  • Sodium-22
  • Bromine-82
  • Iridium-192 in various shielding*
  • Strontium-90***
  • Caesium-134
  • Lutetium-177
  • Technetium-99m*
  • Caesium-137 in various shielding*
  • Manganese-54
  • Thallium-201*
  • Chromium-51
  • Molybdenum-99
  • Thorium-232*
  • Cobalt-57*
  • Neptunium-237 Tin-113
  • Cobalt-60 in various shielding*
  • Palladium-109 Uranium, depleted in various shielding*
  • Europium-152
  • Plutonium, reactor grade in various shielding*
  • Uranium, highly enriched in various shielding*
  • Fluorine-18**
  • Plutonium, weapons grade in various shielding*
  • Yttrium-88
  • Gallium-67*
  • Potassium-40*
  • Gold-198
  • Radium-226*
  • Detection variation with distance for Caesium-137 at 50 μR/h (0.5 μSv/h) (Meets ANSI 42.34) Nominal

*Mandatory radionuclides as defined in ANSI N42.34
**Beta+ emitting radionuclide
***Beta- emitting radionuclide

Fully networked version available

If you need a fully networked solution, the D3S can become part of the DARPA Sigma network with the data from each detector flowing to your command centre. This gives you a fully connected network capability that enables instant communication between all system components.

Full specification

  • Detector types: Gamma and Neutron detection
  • Gamma detector material: CsI(Tl)
  • Gamma detector volume: 1 in3 (16 cm3)
  • Gamma energy range: 30 keV to 3 MeV
  • Gamma sensitivity for Cs137 5 cps/μR/h (500 cps/μSv/h) Photo peak 1.2 cps/μR/h (120 cps/μSv/h)
  • Maximum throughput for gamma channel: 10,000 cps
  • Dose rate: 2.0 mR/h (20 μSv/h) at 662 keV
  • Neutron detector material: Non-3He
  • Neutron detector: 9 cps in a 1 neutron per cm2 field
  • Neutron detector gamma rejection: Better than 10-7, meets ANSI N42.34 section 6.7
  • Maximum throughput for neutron channel: 5,000 cps
  • Communications: Micro USB, Bluetooth®
  • Operational battery life: 12 hours
  • Operational temperature range: −20°C to 50°C, meets ANSI N42.32 section 7.1, section 7.2, section 7.5
  • Device size (excluding phone): 5.2″ x 3.1″ x 0.9″ (132mm x 80mm x 23.5mm)
  • Device volume (excluding phone): 248 cm3
  • Humidity: Up to 93% RH ANSI N42.32 section 7.3
  • Moisture/dust protection: IP53 as per ANSI N42.32 section 7.4
  • Weight: 0.52 lbs (237 g)
  • Battery: 1450mAh Lithium polymer
  • Charging: USB or inductive charging
  • External: LED’s visual detector status
  • Device status indicator: External LED

Find out more about the D3S - it has to be seen to be believed

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