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.

Features

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

Applications

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

Specifications

Detector

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

Basic

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

Output

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

Mechanical

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