SPEAR CZT-based radiation detector

Everything you need in a CZT- based gamma radiation detector in a small ready to use package

CZT-based gamma radiation and x-ray detector

A CZT-based gamma radiation and x-ray detector perfect for immediate use (using Kromek KSpect or MSpect gamma spectroscopy software) or as the gamma radiation and x-ray detector component in your own radiation detector. Being CZT-based the SPEAR (Single Point Extended Area Radiation) can operate at room temperature while still offering high sensitivity. The SPEAR detector is a complete probe, comprising a 5x5x5mm3 CZT detector crystal and low noise hybrid preamplifier in a housing measuring only 13mm diameter x 84mm in length. The probe is supplied complete with a 2 metre long connecting input/output cable, allowing the unit to be used immediately.

Perfect for immediate use or as a gamma radiation and x-ray detector component in your own design of radiation detector.


SPEAR CZT based gamma and x-ray detector


  • Small size
  • Excellent energy resolution
  • High charge collection efficiency
  • High photo peak efficiency
  • Low tailing and high peak-to-valley ratios
  • Room-temperature operation
  • High-speed Detection
  • Robust
  • Non-hygroscopic


  • Gamma-ray spectroscopy
  • Health physics
  • Medical diagnostics
  • Site monitoring
  • X-ray fluorescence
  • Position sensing
  • X-ray diffraction
  • Dosimeters
  • Industrial gauging
  • Astronomy


CZT Detector Dimensions5x5x5mm» with CAPture® contacts
Measurement Capabilities Energy Range: 10 to 670keV
Energy Resolution: < 4% FWHM @ 122 KeV @ 25ºC
(contact eV for exact value depending on the application specifics)
Operating Temperature Range: – 30º to 50º C Standard
 SPEAR Dimensions 12mm diameter x 89mm length
Housing FinishAnodized Gold comes standard. (A wide range
available. Contact eV Products for information)
SPEAR Detector Input Requirements9 PIN Sub D connector: +12V DC, ground
SHV connector: HV bias (typically +500 to +1000VDC)
Signal OutputBNC connector
As assembled, all Input/Output connectors will interface directly
with any standard spectroscopy or counting system.
SPEAR Performance+ 7 to 12V DC Operation
Input Capacitance: 6.6pF
Risetime @ C source: 1pF- 35nS
Falltime @ C source: 1 pF – 725uS
Noise @ C source: 0pF – ~160 e¯ (Si)
Sensitivity: 3.2 mV/fCoul
Power dissipation : 130 mW
(+ 12 VDC supply)

Ready to use out of the box, SPEAR is also an OEM component that can be built into your own detector devices, the Kromek Team can help design and build exactly what you need.

Full technical specification downloads

Datasheet Download

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