Effect of multiple dopants on the quantum efficiency of LiF thermoluminescent dosimeters (TLD) and BaFX (X = Br,Cl,I) storage phosphors

Victor Weir; Jie Zhang; Russell E. Ritenour

doi:10.1117/12.708295

15 March 2007 Effect of multiple dopants on the quantum efficiency of LiF thermoluminescent dosimeters (TLD) and BaFX (X = Br,Cl,I) storage phosphors

Victor Weir, Jie Zhang, Russell E. Ritenour

Author Affiliations +

Proceedings Volume 6510, Medical Imaging 2007: Physics of Medical Imaging; 65103Z (2007) https://doi.org/10.1117/12.708295
Event: Medical Imaging, 2007, San Diego, CA, United States

Abstract

The radiant quantum efficiency (RQE) of x-ray phosphors is defined as the ratio of the emitted luminescent power and the power absorbed by the material. For a given x-ray imaging technique, a high RQE phosphor means a lower x-ray exposure to patients and a better image quality. To improve RQE, phosphors such as LiF and BaFX:Eu ( X = Br, Cl, I) host lattices, which are commonly used in medical dosimetry and imaging system, are always doped with Cu, Ti, or Tb. Experimental observations showed that these dopants can increase phosphor RQE significantly. In this study, we theoretically investigated the effect of additional dopants on the RQE of LiF:Mg and BaFX:Eu host lattices using Density Functional Theory (DFT) in the Local Density Approximation (LDA). Self-consistent charge density calculations were performed. The energy loss function L(w) was obtained and used to calculate the RQE for different phosphors. The results showed that additional dopants produced changes in the optical properties of the phosphors, particularly the energy loss function L(w). Doping with more substitutional impurities increased the RQE of all host lattices except the BaFI lattice where the RQE decreased.

Citation Download Citation

Victor Weir, Jie Zhang, and Russell E. Ritenour "Effect of multiple dopants on the quantum efficiency of LiF thermoluminescent dosimeters (TLD) and BaFX (X = Br,Cl,I) storage phosphors", Proc. SPIE 6510, Medical Imaging 2007: Physics of Medical Imaging, 65103Z (15 March 2007); https://doi.org/10.1117/12.708295

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

;

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
8 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Laser induced fluorescence

X-rays

Chemical species

Dielectrics

Quantum efficiency

Ions

Bromine

Show All Keywords

Keywords/Phrases

Search In:

Publication Years