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 (for example from a dirty bomb or radioactive poisoning) 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.

Two types of application


Stand alone detector

Perfect for fast and easy deployment in smaller numbers as a stand-alone device. Everything you need is on the detector and readable through the app.

  • D3S ID consists of a D3S detector, isotope identification app on Android phone.
  • All cables and user manuals are supplied in a rugged case.
  • The convenience of a PRD, the sensitivity of a RIID.
  • Real-time alarm and adjudication in seconds.
  • Isotope identification and neutron detection on Android phone




Networked detectors

Perfect for deployment in large numbers with detector readings and mapping to a central control screen.

  • D3S NET consists of a D3S detector, isotope identification app on an Android phone and access to the SIGMA Network.
  • SIGMA Network web interface for centralised viewing of all detectors in the network.
  • D3S NET can be deployed in rugged cases of ten units each or rack mounted to facilitate fast deployment.
  • Building blocks for wide area mapping on a remotely hosted server.
  • Provides analysis and visualization for a large network of detectors.
  • The data collected is stored in the D3S NET cloud system, hosted by the AWS (Amazon Web Services).
  • Remote, real-time identification and adjudication of alarm.
  • The phone also functions as a local identification device of isotopes.

D3S features

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, 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 and 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 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

Full specification

The D3S specification is common across both D3S ID and D3S NET.

Gamma 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 detection

  • 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 cp.

Operational spec

  • 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.
  • Communications: Micro USB, Bluetooth®.

Operational spec

  • 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

DARPA tested and approved

Over 10,000 detectors are currently deployed  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.

See the D3S nuclear threat detector in action

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