On the choice of scintillators for "scintillator-photodiode" detectors for digital radiography

• Main Authors: Ryzhikov, V.D., Kozin, D.N.
• Format: Article
• Language: English
• Published: НТК «Інститут монокристалів» НАН України 2004
• Series: Functional Materials
• Online Access: http://dspace.nbuv.gov.ua/handle/123456789/135258

As market proposal of various scintillators with different characteristics is rapidly increasing, it becomes more and more difficult to assess them from the viewpoint of the effects of this or that scintillator property upon parameters of digital X-ray radiography systems. Therefore, optimum choice of scintillators for "scintillator-photodiode" (S-PD) type detectors is a very important aspect in the development and design of new radio -graphic systems. We propose a simple procedure for making this choice, which uses linear matrices of S-PD detectors. It allows evaluation of changes in the relative sensitivity of a radiographic system with variation of the movement speed of the inspected object and the radiation energy on the basis of amplitude-time characteristics of scintillators (decay time and afterglow, light output). Amplitude-time characteristics are presented for scintillat ors ZnSe(Te), Csl(TI), CdWO4. On the basis of these data, it is proposed to use ZnSe(Te) in the 20-100 keV range at object movement speed up to 10 cm/s, Csl(TI) — 90—500 keV up to 10 cm/s, CdWO4 150 keV at the speeds up to 500 cm/s.