Gamma detectors for tomographic flow imaging

✍ Scribed by G.A. Johansen; T. Frøystein

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 791 KB
• Volume: 5
• Category: Article
• ISSN: 0955-5986
• DOI: 10.1016/0955-5986(94)90004-3

✦ Synopsis

The significance and limitations of gamma-ray flow imaging are discussed, with the conclusion that there is a need for compact detectors with fast response. Scintillation crystals are the only practical gamma-absorbers which provide sufficient stopping efficiency over the whole energy range of interest (60 keV to 1.2 MeV). Experimental data on two scintillation light read-out devices are presented. One is the new EDPMT (electron-bombarded silicon diode photomultiplier tube) which is capable of count rates close to 107 c.p.s, over a broad energy range when used with a GSO crystal. A proximity-focused EDPMT version can be made compact and allows tight stacking. The second device is a very compact and robust photodiode. This is a good alternative for low countrate applications (<10 ~ c.p.s) with gamma energies above approximately 600 keV. Both detectors are suitable for process tomography in general, not only flow imaging.