...
In this wiki page we are studying the rapid progress of the silicon radiation detectors, the design of the single sided stereo angle silicon strip detector, CdTe and CdZnTe (CZT) pixel cadmium telluride (CdTe) and cadmium zinc telluride (CdZnTe) or CZT pixel detectors and the development of the detectors in the VTT Technical Research Centre of Finland. The information was collected from Institute of Electrical and Electronics Engineers/Institution of Electrical Engineers (IEEE/IEE) Electronic Library online.
...
Strip silicon radiation detectors
...
Silicon detectors consist of n type material while having p type aluminium strips on the surface which are separated by a thin insulator. At the same time there is an electric field between the p strips and the n type material. When a radiation particle passes the detector, silicon atoms are ionized and free electrons leave these atoms with an electron vacancy (holes). After they reach the p type strip they are collected and then create a charge on the aluminium strip which is possible to be measured with special electronics.
...
Furthermore, detector is designed in a way that every second strip is long while short strips are crossing them which helps to register particles at better angles to the surface of the sensor. Consequently, the high efficiency and proper special resolution are achieved. [3].
CdTe and CdZnTe pixel detectors
Cadmium telluride (CdTe) is a stable crystalline compound composed from cadmium and tellurium. Doped with a small amount of Zn it produces cadmium zinc telluride, (CdZnTe) or CZT.
CdTe and CdZnTe pixel detectors are implementing in imaging systems which are widely used in medical diagnostics (mammography, dental phantoms), astronomy, and industrial research.
CdTe and CdZnTe pixel detectors are very appealing due to their high energy resolution at normal conditions which is not high enough in currently implementing materials. Another advantage of those detectors is their perfect efficiency while working with X-ray energy spectrum as well as compatibility with gamma rays, alpha and beta particles.
Nowadays, there are two ways of using CdTe/CZT detectors. The first one is focused on single channel detectors which are used in X- and gamma- ray spectroscopy. The second is proposed for multi-channel devices in nuclear medicine mostly.
Development in Finland
...