Characterization Of A Pulsed X-ray Source For Fluorescent Lifetime Measurements

Blankespoor, S.C.; Derenzo, S.E.; Moses, W.W.; Ito, Michiya; Oba, K.

doi:10.1109/nssmic.1993.701639

Cited by 7 publications

(11 citation statements)

References 3 publications

(3 reference statements)

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“…Photoluminescence spectra of Development of ZnO:Ga as an Ultrafast Scintillator powdered samples in quartz cuvettes were measured using a Horiba Fluorolog FL3-11 dual monochromator spectrofluorimeter. Luminosity and luminescence decay times were measured using the pulsed x-ray system previously described in [7]. A Displex CSW-202 cryostat configured for use with both the Fluorolog FL3-11 and the pulsed x-ray system was used to acquire data between 10 K and 400 K.…”

Section: Characterizationmentioning

confidence: 99%

Development of ZnO:Ga as an ultra-fast scintillator

Bourret-Courchesne¹,

Derenzo²,

Weber³

2009

Nuclear Instruments and Methods in Physics Research Section A:

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Abstract-We report on several methods for synthesizing the ultra-fast scintillator ZnO(Ga), and measurements of the resulting products. This material has characteristics that make it an excellent alpha detector for tagging the time and direction of individual neutrons produced by t-d and d-d neutron generators (associated particle imaging). The intensity and decay time are strongly dependent on the method used for dopant incorporation. We compare samples made by diffusion of Ga metal to samples made by solid state reaction between ZnO and Ga 2 O 3 followed by reduction in hydrogen. The latter is much more successful and has a pure, strong near-band-edge fluorescence and an ultra-fast decay time of the x-ray-excited luminescence. The luminescence increases dramatically as the temperature is reduced to 10K. We also present results of an alternate low-temperature synthesis that produces luminescent particles with a more uniform size distribution. We examine possible mechanisms for the bright near-band-edge scintillation and favor the explanation that it is due to the recombination of Ga 3+ donor electrons with ionization holes trapped on H + ion acceptors.

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Section: Characterizationmentioning

confidence: 99%

Development of ZnO:Ga as an ultra-fast scintillator

Bourret-Courchesne¹,

Derenzo²,

Weber³

2009

Nuclear Instruments and Methods in Physics Research Section A:

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“…The peak energy is 30kV and a 0.51 mm thick Aluminum foil is used to reduce the presence of soft x-rays in the beam. Details on the experimental set-up are reported in [19]. Fig.…”

Section: Decay Time Measurementsmentioning

confidence: 99%

Measurements of NaI(Tl) Electron Response: Comparison of Different Samples

Hull

Choong

Moses

et al. 2009

IEEE Trans. Nucl. Sci.

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Abstract-This paper measures the sample to sample variation in the light yield proportionality of NaI(Tl), and so explores whether this is an invariant characteristic of the material or whether it depends on the chemical and physical properties of the tested samples.We report on the electron response of nine crystals of NaI(Tl), differing in shape, volume, age, manufacturer and quality. The proportionality has been measured at the SLYNCI facility in the energy range between 3.5 to 460 keV. We observe that while samples produced by the same manufacturer at approximately the same time have virtually identical electron response curves, there are significant sample to sample variations among crystals produced by different manufacturers or at different times.In an effort to correlate changes in the electron response with details of the scintillation mechanism, we characterized other scintillation properties, including the gamma response and the xray excited emission spectra and decay times, for the nine crystals. While sample to sample differences in these crystals were observed, we have been unable to identify the underlying fundamental mechanisms that are responsible for these differences.

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“…A pulsed X-ray system [8,9] is used to measure the time response and to determine the exponential decay components whose sum fits the measured data (Fig. 7).…”

Section: Pulsed X-ray Time Responsementioning

confidence: 99%

Design and Implementation of a Facility for Discovering New Scintillator Materials

Derenzo

Boswell

Bourret-Courchesne

et al. 2008

IEEE Trans. Nucl. Sci.

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Abstract-We describe the design and operation of a highthroughput facility for synthesizing thousands of inorganic crystalline samples per year and evaluating them as potential scintillation detector materials. This facility includes a robotic dispenser, arrays of automated furnaces, a dual-beam X-ray generator for diffractometery and luminescence spectroscopy, a pulsed X-ray generator for time response measurements, computer-controlled sample changers, an optical spectrometer, and a network-accessible database management system that captures all synthesis and measurement data.

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Characterization Of A Pulsed X-ray Source For Fluorescent Lifetime Measurements

Cited by 7 publications

References 3 publications

Development of ZnO:Ga as an ultra-fast scintillator

Development of ZnO:Ga as an ultra-fast scintillator

Measurements of NaI(Tl) Electron Response: Comparison of Different Samples

Design and Implementation of a Facility for Discovering New Scintillator Materials

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