TY - GEN
T1 - Imaging based detector with efficient scintillators for neutron diffraction measurements
AU - Seals, Matt W.
AU - Puplampu, Stephen B.
AU - Penumadu, Dayakar
AU - Riedel, Richard A.
AU - Bunn, Jeff R.
AU - Fancher, Christopher M.
N1 - Publisher Copyright:
© 2020, Association of American Publishers. All rights reserved.
PY - 2020
Y1 - 2020
N2 - The Anger Camera developed by the detector group at the Oak Ridge National Laboratory was utilized for the present work for its unique advantage of employing multiple modules to obtain large active measurement area for detecting diffracted/scattered thermal neutrons. Considering the relatively small flux associated with diffracted/scattered neutrons, suitable efficiency with high spatial resolution is a requirement for utilizing two-dimensional imaging detectors. The potential to implement pulse shape (in addition to pulse height) discrimination-based scintillators further enhances the ability to detect diffracted neutrons with improved signal to noise ratio. In this paper, initial results associated with 6Li glass-based scintillator will be presented. The authors explored the feasibility of using this system to detect and quantify diffraction peaks and peak shifts at the Neutron Residual Stress Facility (NRSF2), High Flux Isotope Reactor (HFIR) in the Oak Ridge National Laboratory (ORNL). Suitable camera mounting and shielding had to be developed. Reference measurements using polycrystalline powders with known atomic planar spacing will be discussed along with measurement settings associated with expected resolution for peak shift measurements. Initial results are promising and demonstrate that a suitable scintillation-based neutron detecting system is viable for residual stress-based diffraction measurements. Small area detectors are also feasible with suitable consideration to scattering volume and distance to detector.
AB - The Anger Camera developed by the detector group at the Oak Ridge National Laboratory was utilized for the present work for its unique advantage of employing multiple modules to obtain large active measurement area for detecting diffracted/scattered thermal neutrons. Considering the relatively small flux associated with diffracted/scattered neutrons, suitable efficiency with high spatial resolution is a requirement for utilizing two-dimensional imaging detectors. The potential to implement pulse shape (in addition to pulse height) discrimination-based scintillators further enhances the ability to detect diffracted neutrons with improved signal to noise ratio. In this paper, initial results associated with 6Li glass-based scintillator will be presented. The authors explored the feasibility of using this system to detect and quantify diffraction peaks and peak shifts at the Neutron Residual Stress Facility (NRSF2), High Flux Isotope Reactor (HFIR) in the Oak Ridge National Laboratory (ORNL). Suitable camera mounting and shielding had to be developed. Reference measurements using polycrystalline powders with known atomic planar spacing will be discussed along with measurement settings associated with expected resolution for peak shift measurements. Initial results are promising and demonstrate that a suitable scintillation-based neutron detecting system is viable for residual stress-based diffraction measurements. Small area detectors are also feasible with suitable consideration to scattering volume and distance to detector.
UR - http://www.scopus.com/inward/record.url?scp=85103586146&partnerID=8YFLogxK
U2 - 10.21741/9781644900574-13
DO - 10.21741/9781644900574-13
M3 - Conference contribution
AN - SCOPUS:85103586146
SN - 9781644900567
T3 - Materials Research Proceedings
SP - 80
EP - 85
BT - Neutron Radiography - 11th World Conference on Neutron Radiography, WCNR 2018
A2 - Salvemini, Filomena
A2 - Bevitt, Joseph J.
PB - Association of American Publishers
T2 - 11th World Conference on Neutron Radiography, WCNR 2018
Y2 - 2 September 2018 through 7 September 2018
ER -