skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Scintillator Efficiency Study with MeV X-Rays

Abstract

We have investigated scintillator efficiency for MeV radiographic imaging. This paper discusses the modeled detection efficiency and measured brightness of a number of scintillator materials. An optical imaging camera records images of scintillator emission excited by a pulsed x-ray machine. The efficiency of various thicknesses of monolithic LYSO:Ce (cerium-doped lutetium yttrium orthosilicate) are being studied to understand brightness and resolution trade-offs compared with a range of micro-columnar CsI:Tl (thallium-doped cesium iodide) scintillator screens. The micro-columnar scintillator structure apparently provides an optical gain mechanism that results in brighter signals from thinner samples. The trade-offs for brightness versus resolution in monolithic scintillators is straightforward. For higher-energy x-rays, thicker materials generally produce brighter signal due to x-ray absorption and the optical emission properties of the material. However, as scintillator thickness is increased, detector blur begins to dominate imaging system resolution due to the volume image generated in the scintillator thickness and the depth of field of the imaging system. We employ a telecentric optical relay lens to image the scintillator onto a recording CCD camera. The telecentric lens helps provide sharp focus through thicker-volume emitting scintillators. Stray light from scintillator emission can also affect the image scene contrast. We have applied an opticalmore » light scatter model to the imaging system to minimize scatter sources and maximize scene contrasts.« less

Authors:
 [1];  [1];  [1];  [1];  [1];  [2];  [1];  [2];  [2];  [2]
  1. National Security Technologies, LLC. (NSTec), Mercury, NV (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Nevada Test Site/National Security Technologies, LLC (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP) (NA-10)
OSTI Identifier:
1245022
Report Number(s):
DOE/NV/25946-2153
DOE Contract Number:  
DE-AC52-06NA25946
Resource Type:
Conference
Journal Name:
Proc. SPIE 9213, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XVI, 92130H (September 5, 2014); doi:10.1117/12.2064028
Additional Journal Information:
Journal Volume: 9213; Conference: SPIE Conference on Optics and Photonics 2014 San Diego, CA August 17 - 21, 2014 http://spie.org/about-spie/press-room/event-news-details/op14-news
Country of Publication:
United States
Language:
English
Subject:
scintillator, radiography, CCD camera, hard x-ray, imaging

Citation Formats

Baker, Stuart A., Brown, Kristina, Curtis, Alden H., Lutz, Stephen S., Howe, Russell A., Malone, Robert M., Mitchell, Stephen E., Danielson, Jeremy, Haines, Todd, and Kwiatkowski, Kris. Scintillator Efficiency Study with MeV X-Rays. United States: N. p., 2014. Web.
Baker, Stuart A., Brown, Kristina, Curtis, Alden H., Lutz, Stephen S., Howe, Russell A., Malone, Robert M., Mitchell, Stephen E., Danielson, Jeremy, Haines, Todd, & Kwiatkowski, Kris. Scintillator Efficiency Study with MeV X-Rays. United States.
Baker, Stuart A., Brown, Kristina, Curtis, Alden H., Lutz, Stephen S., Howe, Russell A., Malone, Robert M., Mitchell, Stephen E., Danielson, Jeremy, Haines, Todd, and Kwiatkowski, Kris. Fri . "Scintillator Efficiency Study with MeV X-Rays". United States. https://www.osti.gov/servlets/purl/1245022.
@article{osti_1245022,
title = {Scintillator Efficiency Study with MeV X-Rays},
author = {Baker, Stuart A. and Brown, Kristina and Curtis, Alden H. and Lutz, Stephen S. and Howe, Russell A. and Malone, Robert M. and Mitchell, Stephen E. and Danielson, Jeremy and Haines, Todd and Kwiatkowski, Kris},
abstractNote = {We have investigated scintillator efficiency for MeV radiographic imaging. This paper discusses the modeled detection efficiency and measured brightness of a number of scintillator materials. An optical imaging camera records images of scintillator emission excited by a pulsed x-ray machine. The efficiency of various thicknesses of monolithic LYSO:Ce (cerium-doped lutetium yttrium orthosilicate) are being studied to understand brightness and resolution trade-offs compared with a range of micro-columnar CsI:Tl (thallium-doped cesium iodide) scintillator screens. The micro-columnar scintillator structure apparently provides an optical gain mechanism that results in brighter signals from thinner samples. The trade-offs for brightness versus resolution in monolithic scintillators is straightforward. For higher-energy x-rays, thicker materials generally produce brighter signal due to x-ray absorption and the optical emission properties of the material. However, as scintillator thickness is increased, detector blur begins to dominate imaging system resolution due to the volume image generated in the scintillator thickness and the depth of field of the imaging system. We employ a telecentric optical relay lens to image the scintillator onto a recording CCD camera. The telecentric lens helps provide sharp focus through thicker-volume emitting scintillators. Stray light from scintillator emission can also affect the image scene contrast. We have applied an optical light scatter model to the imaging system to minimize scatter sources and maximize scene contrasts.},
doi = {},
journal = {Proc. SPIE 9213, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XVI, 92130H (September 5, 2014); doi:10.1117/12.2064028},
number = ,
volume = 9213,
place = {United States},
year = {2014},
month = {9}
}

Conference:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share: