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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, 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.
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Development in Finland
Today there are two big companies which implement CdTe/CZT detectors in Finland.
AJAT designs and manufacture imaging systems based on those detectors. They use new mechanism of straight conversion on the signal from detector to read out CMOS chips. AJAT products are integrated by OEM partners from different areas: from medicine and dental care to industrial 3D imaging. [6].
Examples of AJAT products:
• ART Plus Panoramic Imaging System (Dental care)
• Industrial CT and laminography for inspection of pipes in nuclear power stations (Industry)
• Bone densitometry (Medicine). [6].
VTT is the second company which uses CdTe/CZT detectors. They provide patterning method of the thick diffused junctions on as well as Hybrid CdTe-CMOS Semiconductor Radiation Detectors. Unfortunately, VTT do not disclose their patents’ information widely so there are only basic properties of the technology are known.
VTT Technical Research Centre of Finland has been developing strip silicon radiation detectors for many years. What is more, VTT have been closely working with CERN which conducts the most important experiments on particle physics in the world.
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Rehak, P. ; Brookhaven Nat. Lab., Upton, NY, USA. Silicon radiation detectors [online]. Nuclear Science Symposium Conference Record, 2003 IEEE (Volume:5 ); 19-25 Oct. 2003, 2492-2497.
URL:
http://ieeexplore.ieee.org.ezproxy.metropolia.fi/stamp/stamp.jsp?tp=&arnumber=1352629
Accessed 16 March 2013.
Virolainen, T. ; Kamarainen, V. ; Ji, F. ; Garcia, F. ; Orava, R. ; van Remortel, N. ; Santala, M. Silicon radiation detector development at VTT [online]. Nuclear Science Symposium Conference Record, 2007. NSS '07. IEEE (Volume:2 ); Oct. 26 2007-Nov. 3 2007, 1494-1497.
URL:
http://ieeexplore.ieee.org.ezproxy.metropolia.fi/stamp/stamp.jsp?tp=&arnumber=4437282
Accessed 16 March 2013.
Huhtinen, M. ; Res. Inst. for High Energy Phys., Helsinki, Finland ; Orava, R. ; Pimia, M. ; Tuuva, T. Single sided stereo angle silicon strip detector [online]. Nuclear Science, IEEE Transactions on (Volume:40 , Issue: 4 ); Aug 1993, 227-229.
URL:
http://ieeexplore.ieee.org.ezproxy.metropolia.fi/stamp/stamp.jsp?tp=&arnumber=256575
Accessed 16 March 2013.
- Yossi Yossi Eisen, Asher Shor, Israel Mardor (2004) CdTe and CdZnTe X-Ray and Gamma-Ray Detectors for Imaging Systems. IEEE transactions on nuclear nuclear science; June 2004, Val. 51, No. 3.
- Tom Schulman (2006) Si, CdTe and CdZnTe radiation detectors for imaging applications. University of Helsinki, Finland; June 19, 2006.
- AJAT official webpage, http://www.ajat.fi/