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Institute for Single Crystals

National Academy of Sciences of Ukraine

61001, Ukraine, Kharkiv, 60 Nauky Ave., phone/fax: +38(057)340-86-19, e-mail: info@iscrystals.com

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Semiconductor Gamma-Ray Detectors

Semiconductor detectors based on CZT crystals provide direct conversion of radiation energy into an electrical signal. They are compact (< 1 cm3) and successfully operate at the room temperature without requiring of the liquid nitrogen cooling, but they have an energy resolution in the gamma-ray spectrometry, which is close to the germanium detectors.


The crystals of Cd1-XZnXTe (CZT) (x≈0,1) is an effective material for registration of ionizing (mainly gamma-) radiation when solving the problems of radiation monitoring, medical testing, pollutions of the environment monitoring, as well as for use in space technology and astronomy.

Manufactured in the Institute for single crystals semiconductor detectors based on crystals of Cd1-XZnXTe provide direct conversion of radiation energy into an electrical signal. They are compact (< 1 cm3) and successfully operate at the room temperatures without requiring liquid nitrogen cooling as germanium detectors. Nevertheless, the use of the special methods when charge collecting and output handling allows to achieve the parameters of the energy resolution in gamma-ray spectrometry, close to the germanium detectors.

CZT-detectors characteristics
 Useful capacity
 0.001...1 cm3
 Energy range
 5 keV...1.5 MeV
 Dynamic range of exposure dose rate
 10 μR/h...1 R/h
 Energy resolution on 137Cs < 6%
 Energy resolution on 241Am
 < 10%
 Detection efficiency at 60 keV (detector thickness 2 mm)
 99.27%
 Operation temperature range
 -40...+50 C°
 Bias 10...1000 V
 Electrical resistivity
 1010...1011 Ohm/cm
 Maximum size
 10x10x10 mm3
 Contacts type and material planar, Au or In




Our adress:


61001, Kharkov, 60 Lenin Ave.
phone:  +38(057)340-86-19,
fax:       +38(057)340-86-19,
e-mail:   info@iscrystals.com