Quantum Utilization in X-Ray Intensifying Screens

Author

Sklensky, A.F. ; Buchanan, R.A. ; Maple, T.G. ; Bailey, H.N.

Author_Institution

Lockheed Palo Alto Research Laboratory, Palo Alto, California 94304

Volume

21

Issue

1

fYear

1974

Firstpage

685

Lastpage

691

Abstract

It is the purpose of this paper to present a comprehensive comparison of the different rare-earth oxysulfide x-ray screens. Relative speed and resolution of Y2O2S:Tb, La2 O2S:Tb and Gd2O2S:Tb as used with conventional x-ray film and experimental (green sensitive) x-ray film are reported. A comparison is also made of the performance of the experimental rare-earth oxysulfide screens and commercial CaWO4 screens. Both La2O2S:Tb and Gd2O2S:Tb are observed to be considerably faster than Y2O2S:Tb and CaWO4 for screens of comparable resolution. La2O2S:Tb perform better for tube voltage below 90 kVp. Above 90 kVp, Gd2 O2S:Tb is best. These performance characteristics are related to the quantum utilization of the screens. The quantum utilization is defined as the fraction of the x-ray energy incident upon the screen that is actually absorbed by the screen. Calculations of the quantum utilization for oxysulfide and CaWO4 screens are presented.

Keywords

Atomic measurements; Biological materials; Biomedical materials; Biomedical measurements; Coatings; Electromagnetic wave absorption; Energy resolution; Laboratories; Phosphors; Voltage;

fLanguage

English

Journal_Title

Nuclear Science, IEEE Transactions on

Publisher

ieee

ISSN

0018-9499

Type

jour

DOI

10.1109/TNS.1974.4327532

Filename

4327532