Nuclear radiation
Semiconductor detectors
and Associated electronics


OEM Detection Module

DM118 / DM118/L

The compact and low power consuming Detection Modules DM118, DM118/L with CdZnTe (CZT) detectors of volume 500 mm3 or 1600 mm3 are designed for gammaradiation measurements. These modules are intended for an easy integration in customer specific equipment.
The detector module includes CZT detector, charge sensitive preamplifier, spectroscopy shaping amplifier, detector HV bias supply.
The charge sensitive preamplifier with FET input and resistive feedback convert the charge carriers developed in the CZT detector during each absorbed nuclear event to a step function voltage pulse, the amplitude of which is proportional to the total charge accumulated in that event.
The spectroscopy shaping amplifier is intended for magnify the amplitude of the preamplifier output pulse and shapes the pulses to optimize the energy resolution.
The low power detector bias supply provides stabile, low noise high voltage in a range up to 2000 V necessary for proper operation of CZT detector. Selection and assignment of an optimal operation high voltage for the detector is performed by the manufacturer.


  • High efficiency
  • High energy resolution
  • Room temperature operation
  • Small dimensions and weight


  • Gamma-radiation spectroscopy
  • Portable and field spectrometers
  • Environmental monitoring
  • Nuclear industry
  • Home land security



  • Type CdZnTe quasi-hemispherical detector
  • Detector volume
    • DM118 500 mm3
    • DM118/L 1600 mm3


  • Energy Resolution (FWHM) at 662 keV,
    • DM118 ≤ 3.0%
    • DM118/L ≤ 4.0%
  • Peak-to-Compton Ratio > 4.0
  • Charge sensitivity > 1 V/MeV
  • Integral nonlinearity (50 keV … 1.4 MeV) < 0.5%
  • Recommended operation temperature range* +10°C to +40°C
  • Shift peak position in range of operation temperature < 0.02% / °C
  • Shift peak position for 8 hours of continuous operation < 0.2%
  • Power requirements +5 V, < 12 mA; -5 V, < 12 mA


  • Signal polarity positive
  • Impedance 50 Ω
  • Peaking time ≈ 1.0 µs
  • Pulse width (FWHM) ≈ 2.2 µs


  • Connector** Hirose DF13-5P-1.25DSA
  • Dimensions 45 mm x 50 mm x 16 mm
  • Assembly holes 4 x Ø2.2 mm
  • Weight 30 g

*NOTE: On special request a wider range of operating temperatures up to -20°C to +50°C is available.
**NOTE: On special request, a connector with a pitch of 2 mm is available, for example Adam Tech 2PH1-04-VA

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