IDEA #1FQ94S X- And Gamma-Ray Detectors Made From Semiconductor Compound Cdte (Cdznte)

APPLIED RESEARCH • APPLIED MATERIALS RESEARCH XX(cid:2)(cid:2) AND GAMMA(cid:2)(cid:2)RAY DETECTORS MADE FROM SEMICONDUCTOR COMPOUND CDTE ((CDZNTE)) Fig 1 Gamma(cid:2)ray detectors from CdTe (CdZnTe) Stage ooff technology development Analysis of technical feasibility ContactsContact person: Dr. Alexander V. Rybka Organisation name: National Science Centre "Kharkov Institute of Physics & Technology", 1, Akademicheskaya St., Kharkov, Ukraine 61108 Tel.: +380(cid:2)57(cid:2)335(cid:2)66(cid:2)37 Fax:+380(cid:2)57(cid:2)335(cid:2)17(cid:2)39 DescriptionX(cid:2) and gamma(cid:2)ray detectors from semiconductor compounds 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 semicon(cid:2) ductor detectors, let alone traditional gas and scintillator detectors. Innovation and main technical and competitive 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 semicon(cid:2) ductor 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 man(cid:2) ufactured by custom request only at the following specialized firms: eV(cid:2)PRODUCTS, AMPTEK, DIGIRAD — USA, EURORAD, CEA Leti — France; ACROTEC — Japan. The preliminary esti(cid:2) mations 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 ana(cid:2) logue 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 sever(cid:2) al last years supplied CdTe and CdZnTe detectors to different enterprises of Ukraine and Russia. The specifications for the detectors from CdTe and CdZnTe (TX201Ð?P) 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). Sphere ooff possible application • Medicine: for X(cid:2)ray and positron tomography (PET), patient dose load measurements at radiation diagnostics and thera(cid:2) py; • Nuclear power: for dosimeter and monitoring of NPP terri(cid:2) tory (including Chernobyl zone), isotope composition analysis and tightness monitoring of fuel pins; • Ecology: for environment monitoring; • Geology: for aerospace investigation; • Scientific researches. 28