Uniformity measurements and new positioning algorithms for wavelength-shifting fiber neutron detectors

Wang, CL; Riedel, Richard A.

doi:10.1016/j.nima.2014.03.024

Cited by 6 publications

(15 citation statements)

References 16 publications

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“…3(c). The general trend is that the light output increases with the neutron detection efficiency, as observed previously in the study of uniformity of neutron efficiency of WLSF detectors [4]. In addition, the grooved AST scintillator has a light output which is only about 66% that of flat Eljen 0.8-mm-thick scintillator, though it has an effective thickness close to L=0.8 mm.…”

Section: Resultssupporting

confidence: 71%

“…The Y N of Eljen 0.8-mm-thick scintillator is a little higher than the expected value from the diffusion model, in contrast with the AST grooved scintillator. Compared with flat scintillators, the lower photon yield of grooved scintillator indicates that it has lower neutron detection efficiency [4] when applied on a WLSF detector under the same conditions.…”

Section: Resultsmentioning

confidence: 99%

“…The light response function (LRF) is defined as the distribution of the end-to-end distances from the locations of neutron absorption to photon detection projected along the x-axis [4]. The photon travellength is the average full-width-at-half-maximum (FWHM) of the LRFs at different x-pixels [4]. We measured the LRFs from the neutron events compromising the diffraction patterns of diamond and vanadium powder samples.…”

Section: Methodsmentioning

confidence: 99%

“…At the Spallation Neutron Source (SNS), Oak Ridge National Laboratory (ORNL), a wavelength-shifting-fiber (WLSF) neutron detector with 0.3 m 2 per module was developed [3] and has been deployed for time-of-flight (TOF) neutron powder diffraction (POWGEN, VULCAN).However, these detectors have relatively low efficiencies at short neutron wavelengths ( 1.8 Å), which is an important wavelength band for the POWGEN instrument. It is a serious challenge to design an efficient WLSF detector at shorter wavelengths with reduced ghosting (mis-assigned neutron events) [4] and without a loss in spatial resolution. This issue can be mitigated through the optimization of ZnS/ 6 LiF scintillators.…”

Section: Introductionmentioning

confidence: 99%

“…In this work, we report thickness-dependent light output, neutron absorption efficiency, and photon travel length [4] of flat and grooved ZnS/ 6 LiF scintillators obtained using a moderated 252 Cf neutron source and two SNS beamlines (VULCAN and POWGEN). We used a potential-well model and a photon-diffusion model under weak disorder to explain the results.…”

Section: Introductionmentioning

confidence: 99%

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Optimizing ZnS/⁶LiF scintillators for wavelength-shifting-fiber neutron detectors

Wang

Crow

Funk

et al. 2015

2015 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC)

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In this paper we compare the performance of grooved and flat ZnS/ 6 LiF scintillators in a wavelengthshifting-fiber (WLSF) detector.Flat ZnS/ 6 LiF scintillators with the thickness L=0.2-0.8 mm were characterized using photon counting and pulse-height analysis and compared to a grooved scintillator of approximately 0.8 mm thick.While a grooved scintillator considerably increases the apparent thickness of the scintillator to neutrons for a given coating thickness, we find that the flat scintillators perform better than the grooved scintillators in terms of both light yield and neutron detection efficiency. The flat 0.8-mm-thick scintillator has the highest light output, and it is 52% higher compared with a grooved scintillator of same thickness. The lower light output of the grooved scintillator as compared to the flat scintillator is consistent with the greater scintillator-WLSF separation and the much larger average emission angle of the grooved scintillator. We also find that the average light cone width, or photon travellength as measured using time-of-flight powder diffraction of diamond and vanadium, decreases with increasing L in the range of L=0.6-0.8 mm. This result contrasts with the traditional Swank diffusion model for micro-composite scintillators, and could be explained by a decrease in photon diffusion-coefficient or an increase in micro-particle content in the flat scintillator matrix for the thicker scintillators.I.

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Section: Resultssupporting

confidence: 71%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Optimizing ZnS/⁶LiF scintillators for wavelength-shifting-fiber neutron detectors

Wang

Crow

Funk

et al. 2015

2015 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC)

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The research of laser-based rapid measurement system for scintillator neutron detectors arrays

Tang

Huang

et al. 2020

Radiat Detect Technol Methods

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Performance improvements of wavelength-shifting-fiber neutron detectors using high-resolution positioning algorithms

Wang

2016

Review of Scientific Instruments

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Three high-resolution positioning methods based on the FluoroBancroft linear-algebraic method [S. B. Andersson, Opt. Express 16, 18714 (2008)] are proposed for wavelength-shifting fiber (WLSF) neutron detectors. Using a Gaussian or exponential-decay light-response function, the non-linear relation of photon-number profiles vs. x-pixels was linearized and neutron positions were determined. After taking the super-Poissonian photon noise into account, the proposed algorithms give an average of 0.03-0.08 pixel position error much smaller than that (0.29 pixel) from a traditional maximum photon algorithm (MPA). The new algorithms result in better detector uniformity, less position misassignment (ghosting), better spatial resolution, and an equivalent or better instrument resolution in powder diffraction than the MPA. These improvements will facilitate broader applications of WLSF detectors at time-of-flight neutron powder diffraction beamlines, including single-crystal diffraction and texture analysis.

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Uniformity measurements and new positioning algorithms for wavelength-shifting fiber neutron detectors

Cited by 6 publications

References 16 publications

Optimizing ZnS/⁶LiF scintillators for wavelength-shifting-fiber neutron detectors

Optimizing ZnS/⁶LiF scintillators for wavelength-shifting-fiber neutron detectors

The research of laser-based rapid measurement system for scintillator neutron detectors arrays

Performance improvements of wavelength-shifting-fiber neutron detectors using high-resolution positioning algorithms

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Uniformity measurements and new positioning algorithms for wavelength-shifting fiber neutron detectors

Cited by 6 publications

References 16 publications

Optimizing ZnS/6LiF scintillators for wavelength-shifting-fiber neutron detectors

Optimizing ZnS/6LiF scintillators for wavelength-shifting-fiber neutron detectors

The research of laser-based rapid measurement system for scintillator neutron detectors arrays

Performance improvements of wavelength-shifting-fiber neutron detectors using high-resolution positioning algorithms

Contact Info

Product

Resources

About

Optimizing ZnS/⁶LiF scintillators for wavelength-shifting-fiber neutron detectors

Optimizing ZnS/⁶LiF scintillators for wavelength-shifting-fiber neutron detectors