X-ray and gamma-ray response of a 2″×2″ LaBr3:Ce scintillation detector

Quarati, F.; Bos, A.J.J.; Brandenburg, S.; Dathy, C.; Dorenbos, P.; Kraft, Stefan; Ostendorf, Reint; Ouspenski, V.; Owens, A.

doi:10.1016/j.nima.2007.01.161

Cited by 123 publications

(42 citation statements)

References 9 publications

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“…These measurements included a study of resolution as a function of shaping time (Ortec DigiBases, bipolar shaping) and high voltage applied to the photomultiplier tubes, with the goal being to identify suitable instrument operating windows (Figure 7, top) [Knoll 2000]. Once we identified suitable settings , we used a series of check sources to assess the expected energy resolution (relative FWHM) as a function of energy (Figure 7, bottom), in a manner consistent with similar work by others [Moszynski 2002;Ciemala 2009;Nicolini 2007;Quarati 2007]. Due to relatively high count rates expected in the cylinder assay scenario, we made further measurements to evaluate the resolution of each detector as a function of incident count rate.…”

Section: Calibration and Characterization Of Gamma-ray Spectrometersmentioning

confidence: 91%

Hybrid Enrichment Assay Methods for a UF6 Cylinder Verification Station: FY10 Progress Report

Smith¹,

Jordan²,

Orton³

et al. 2010

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SummaryPacific Northwest National Laboratory (PNNL) is developing the concept of an automated UF 6 cylinder verification station that would be located at key measurement points to positively identify each cylinder, measure its mass and enrichment, store the collected data in a secure database, and maintain continuity of knowledge on measured cylinders until the arrival of International Atomic Energy Agency (IAEA) inspectors. At the center of this unattended system is a hybrid enrichment assay technique that combines the traditional enrichment-meter method (based on the 186-keV peak from 235 U) with nontraditional neutron-induced high-energy gamma-ray signatures (spawned primarily by 234 U alpha emissions and 19 F(α,n) reactions). Previous work by PNNL provided proof-of-principle for the nontraditional signatures to support accurate, full-volume interrogation of the cylinder enrichment, thereby reducing the systematic uncertainties in enrichment assay due to UF 6 heterogeneity and providing greater sensitivity to material substitution scenarios [Smith 2009;Smith In press].The work described here builds on that preliminary evaluation of the non-traditional signatures, but focuses on a prototype field system utilizing NaI(Tl) and LaBr 3 (Ce) spectrometers, and enrichment analysis algorithms that integrate the traditional and non-traditional signatures. Results for the assay of Type-30B cylinders ranging from 0.2 to 4.95 wt% 235 U, at an AREVA fuel fabrication plant in Richland, WA, are described for the following enrichment analysis methods: 1) traditional enrichment meter signature (186-keV peak) as calculated using a square-wave convolute (SWC) algorithm; 2) nontraditional high-energy gamma-ray signature that provides neutron detection without neutron detectors and 3) hybrid algorithm that merges the traditional and non-traditional signatures. Uncertainties for each method, relative to the declared enrichment for each cylinder, are calculated and compared to the uncertainties from an attended HPGe verification station at AREVA, and the IAEA's uncertainty target values for feed, tail and product cylinders. Table 1 provides a summary of those results below. Traditional NaI (SWC method) 3.5 7.9 13Non-Traditional NaI 3.7 4.9 32Hybrid NaI (simple average) 2.5 4.6 9.71 The target uncertainties are estimated from the combination of systematic and random errors given in Kuhn and should be used only to set the scale of the target uncertainties.iv A summary of the major findings from the field measurements and subsequent analysis follows:• Traditional enrichment-meter assay using specially collimated NaI spectrometers and a SquareWave-Convolute algorithm can achieve uncertainties comparable to HPGe and LaBr for product, natural and depleted cylinders.• Non-traditional signatures measured using NaI spectrometers enable interrogation of the entire cylinder volume and accurate measurement of absolute 235 U mass in product, natural and depleted cylinders.• A hybrid enrichment assay method can achieve lower uncertainties than e...

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Section: Calibration and Characterization Of Gamma-ray Spectrometersmentioning

confidence: 91%

Hybrid Enrichment Assay Methods for a UF6 Cylinder Verification Station: FY10 Progress Report

Smith¹,

Jordan²,

Orton³

et al. 2010

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“…Figure 3 shows that the 662 keV peak is readily observed in the SrI 2 (Eu) spectrum, while the poorer energy resolution of NaI(Tl) degrades its ability to detect the source, and the intrinsic background in LaBr 3 (Ce) (La-138 gammas at 789 and 1436 keV, betas in 0-255 keV range, the Ba-138 32-37 keV x-rays, and sums of these) complicates its spectrum [11].…”

Section: Gamma Spectroscopymentioning

confidence: 99%

Comparative gamma spectroscopy with SrI<inf>2</inf>(Eu), GYGAG(Ce) and Bi-loaded plastic scintillators

Cherepy

Payne

Sturm

et al. 2010

IEEE Nuclear Science Symposuim &Amp; Medical Imaging Conference

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Abstract-We are developing new scintillator materials that offer potential for high resolution gamma ray spectroscopy at low cost. Single crystal SrI 2 (Eu) offers ~3% resolution at 662 keV, in sizes of ~1 in 3 . We have developed ceramics processing technology allowing us to achieve cubic inch scale transparent ceramic scintillators offering gamma spectroscopy performance superior to NaI(Tl).We fabricated a bismuth-loaded plastic scintillator that demonstrates energy resolution of ~8% at 662 keV in small sizes.

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“…8 Furthermore, LaBr 3 :Ce scintillators have large stopping power in spite of their relatively lower effective atomic number, since it is possible to make a large crystal with high density (5.3 g/cm 3 ). [9][10][11] They are also suitable for high energy gamma ray measurements (e.g., cosmic ray, characteristic gamma ray due to nuclear reactions 12 and environmental radiation 13 ). Additionally, fluorescence characteristics of LaBr 3 :Ce scintillators have only a small dependency on thermal changes 14 and have strong radiation-resistance.…”

Section: Introductionmentioning

confidence: 99%

Feasibility study on signal separation for spontaneous alpha decay in LaBr3: Ce scintillator by signal peak-to-charge discrimination

Ogawara

Ishikawa

2015

Review of Scientific Instruments

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A novel analysis method named peak-to-charge ratio (Vp/Qtotal) discrimination, aiming at background rejection especially for alpha decay self-activity in LaBr3: Ce scintillators has been developed. This method is based on a waveform analysis using the peak-to-charge ratio in the output waveform of a photomultiplier tube. The discrimination of alpha-induced events was achieved by using a threshold function based on the error propagation of the Vp/Qtotal value. The accidental rejection ratio of gamma-induced events was evaluated to be 0.17%. Furthermore, a total absorption peak spectrum processed with the Vp/Qtotal discrimination method for 68Ga 1.883 MeV gamma rays, where the energy was overlapped with background alpha events, reproduced exactly the same result as that of the background subtraction method. The difference in measured peak counts of both methods was 0.716%, and the statistical error in the Vp/Qtotal discrimination method and background subtraction was 4.81% and 8.70%, respectively. Thus a higher-accuracy measurement could be achieved using the Vp/Qtotal discrimination method. The present study demonstrates that the Vp/Qtotal discrimination method is a promising method for background rejection of the spontaneous alpha decay in LaBr3: Ce scintillators.

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X-ray and gamma-ray response of a 2″×2″ LaBr3:Ce scintillation detector

Cited by 123 publications

References 9 publications

Hybrid Enrichment Assay Methods for a UF6 Cylinder Verification Station: FY10 Progress Report

Hybrid Enrichment Assay Methods for a UF6 Cylinder Verification Station: FY10 Progress Report

Comparative gamma spectroscopy with SrI<inf>2</inf>(Eu), GYGAG(Ce) and Bi-loaded plastic scintillators

Feasibility study on signal separation for spontaneous alpha decay in LaBr3: Ce scintillator by signal peak-to-charge discrimination

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