Radiation Monitor

NMD-3 Gamma Radiation Monitor

NMD-3 is a low-resolution spectrometer of gamma radiation made from the cheap and reliable plastic scintillator. The purpose of the device is to detect radioactive material passing by inside a vehicle, conveyor, air duct, or piping.


  • Low cost and robust plastic scintillator
  • Spectroscopic signal analysis for radiation source discrimination and improved sensitivity
  • Customizable: Detector shape and dimensions, software interface, and hardware peripherals are chosen according to customers requirements

Prototype model parameters

Fast acquisition and high sensitivity: will detect 12 micrograms of Cs-137 isotope inside a vehicle passing by at 70 km/h at a distance of 5 m in a typical 20 uR/h background.


  • Scintillator material: plastic
  • Scintillator volume: 20 liters
  • Spectral sensitivity improves detection range and allows radiation source discrimination
  • Multichannel analyzer: 2048 channels, 16 bit per channel
  • Gamma energy range: 3000 keV
  • Background auto-correction
  • Integration time frame: 300 ms
  • Detection threshold: 1000 kBq of Cs-137 (detection probability 0.5 at 95% confidence probability) at background rate 20 µR/h
  • False alarm rate < 1/1000
  • Operating temperature range: -50°С to +50 °С
  • PC Interface: USB
  • Dimensions: 800х960×210 mm
  • Weight: 41 kg

Target applications

Portal monitor

  • Road Traffic “in situ” monitoring
  • Railroad cargo monitoring
  • Container monitoring in ports
  • Safety control in subway embedded in a turnstile

Conveyor monitor

  • Raw products input inspection
  • Parcel inspection
  • Waste recycling
  • Mining

Pipeline monitor

  • Drinking water pipelines
  • Air ducts

To place an order, please contact info@trinitri.ru.