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Home Material Sciences X- and GAMMA-RAY detectors made from semiconductor compound CDTE (CdZnTe)

X- and GAMMA-RAY detectors made from semiconductor compound CDTE (CDZNTE)


The observation of the offer in the market of semiconductor detectors of ionizing radiations over the years 1990 — 2006 shows that increasingly stable position in it is taken by CdTe and CdZnTe detectors. In a number of cases they push aside widely used silicon and germanium semiconductor detectors, let alone traditional gas and scintillator detectors.

Innovative Aspect and Main Advantages

The main advantages of СdTe and CdZnTe detectors are their ability to operate at room temperatures (without cryogenic equipment) and high sensitivity to the radiation at small size. The main disadvantages are relatively high cost of semiconductor crystals and the absence of widely known technologies of processing crystals.

The production of CdTe or CdZnTe detectors in CIS countries does not exist. In developed countries such products are manufactured by custom request only at the following specialized firms: eV-PRODUCTS, AMPTEK, DIGIRAD — USA, EURORAD, CEA Leti — France; ACROTEC — Japan. The preliminary estimations allow us to assert that the detectors cost will be 1.5–2 times lower than in the listed above companies. At the same time the performance characteristics (discrete and analogue sensitivity, dark current, radiation resistance) of our detectors will not be inferior to the world level.

NSC KIPT and RPC "Sensor" Ltd., developed and during several last years supplied CdTe and CdZnTe detectors to different enterprises of Ukraine and Russia. The specifications for the detectors from CdTe and CdZnTe (TX201АP) were developed in NSC KIPT and are registered in the State Committee for Standardization, Metrology.

Specimens have passed the preliminary tests in NSC "Institute of Metrology" (Kharkov).

Areas of Application

  • Medicine: for X-ray and positron tomography (PET), patient dose load measurements at radiation diagnostics and therapy;
  • Nuclear power: for dosimeter and monitoring of NPP territory (including Chernobyl zone), isotope composition analysis and tightness monitoring of fuel pins;
  • Ecology: for environment monitoring;
  • Geology: for aerospace investigation;
  • Scientific researches.

Gamma-ray detectors from CdTe (CdZnTe)
Fig. 1 Gamma-ray detectors from CdTe (CdZnTe)

Stage of Development

Analysis of technical feasibility

Contact Details

Contact person: Dr. Alexander V. Rybka
Organisation name: National Science Centre "Kharkov Institute of Physics & Technology",
1, Akademicheskaya St., Kharkov, Ukraine 61108
Tel.: +38057 335-6637
Fax: +38057 335-1739

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