Photosensors for PET scanner on the base of BaF2 crystals

✍ Scribed by G. Benemanskaya; E. Garibin; Yu. Gusev; A. Demidenko; S. Ivanov; V. Ivochkin; S. Kosianenko; I. Mironov; Yu. Mousienko; V. Jmerik; V. Reiterov; D. Seliverstov; T. Shubina

• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 209 KB
• Volume: 610
• Category: Article
• ISSN: 0168-9002
• DOI: 10.1016/j.nima.2009.05.104

✦ Synopsis

We suggest the use of crystal of BaF 2 as scintillator in Positron Emission Tomography (PET) with very high space resolution at the level of 1-2 mm. These crystals are prospective candidates to provide necessary cell granularity (crystal+photodetector) of 2 Â 2 mm 2 and they possesses a very short decay time ($0.8 ns) of the fast component in the emission spectrum. In order to detect this emission lying within deep ultra-violet (UV) spectral range with wavelengths 195-240 nm we propose to develop new type of photodetecting devices. These ones are based on wide band gap group-III nitride compounds (A 3 N) having an adjustable spectral sensitivity at wavelengths 210-360 nm and quantum efficiency 10-15%. The principal schemes of such devices based on A 3 N-nanoheterostructures emitting photoelectrons into vacuum or gaseous atmosphere and detector of photoelectrons are discussed in this paper. The photo-device with parallel-plane gas positron sensitive detector having time and position resolutions 1 ns and 500 mm, respectively, can work at counting rate up to 10 8 ph cm À2 s À1 .