Statistical control and optimization of X-ray intensity measurements

Ancey, M; Bastenaire, F; Tixier, R.

doi:10.1088/0022-3727/10/6/004

Cited by 35 publications

(19 citation statements)

References 18 publications

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“…The minimum detection limits are calculated following the procedure described by Ancey et al (1977). Confidence levels for concentrations as measured by the electron probe are given in Gunn et al (1992), which recast the expression given by Ancey et al (1978).…”

Section: Analytic Proceduresmentioning

confidence: 99%

Temperature effects on the calcite skeletal composition of deep-water gorgonians (Isididae)

Thresher¹,

Wilson²,

MacRae³

et al. 2010

Geochimica et Cosmochimica Acta

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Section: Analytic Proceduresmentioning

confidence: 99%

Temperature effects on the calcite skeletal composition of deep-water gorgonians (Isididae)

Thresher¹,

Wilson²,

MacRae³

et al. 2010

Geochimica et Cosmochimica Acta

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“…For a given Pu concentration the corresponding grey levels in each qualitative profile are averaged. The averaging method which leads to an equation translating grey levels of the image into plutonium concentrations can then be established by means of a linear weighted least squares regression such as those described in details by Ancey et al [15]. The qualitative greyscale image is transformed into a semi-quantified image.…”

Section: Calibration Linementioning

confidence: 99%

Characterization of plutonium distribution in MIMAS MOX by image analysis

Oudinet

Munoz-Viallard

Aufore

et al. 2008

Journal of Nuclear Materials

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A better understanding of MOX fuel in-pile behaviour requires a very detailed characterization of the Pu distribution in the pellet before and after irradiation. Electron probe microanalysis (EPMA) can be used to determine the distributions of chemical elements with a spatial resolution of 1 lm. This paper describes the development of X-ray microanalysis techniques to produce semi-quantitative 'maps' of plutonium concentrations in order to rapidly characterize large areas of the fuel microstructure (1 mm 2 ) with reasonable accuracy. A new segmentation technique based on statistical compatibility is then proposed, so as to finely describe the MIMAS MOX fuel microstructure. Two materials were finely characterized to demonstrate the reliability of this new method. In each case, the results demonstrate the good and reliable accuracy of this new characterization methodology. The analysis method used is currently able to identify three so-called phases (Pu-rich agglomerates, a coating phase and uranium-rich agglomerates), as well as to quantify the plutonium distribution and the plutonium content of these three phases. The impact of the fabrication process on the microstructure can be seen both in the surface distribution variations of the plutonium and in the local plutonium content variations.

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“…The beam was defocused (10 lm) and acquisition times were of 10 s for Ca, 20 s for Ba and 20-40 s for Mg, Mn and Sr. A diopside and a strontium silicate crystal of known composition were used as standards. The analytical precision expressed as 2r was calculated using the method developed by Ancey et al (1977). Chemical profiles were conducted on the shell with an automated step of 10 lm for one profile and 20 lm for the others (Fig.…”

Section: Electron Probe Microanalysis (Epma)mentioning

confidence: 99%

Nyctemeral variations of magnesium intake in the calcitic layer of a Chilean mollusk shell (Concholepas concholepas, Gastropoda)

Lazareth

Guzmán

Poitrasson

et al. 2007

Geochimica et Cosmochimica Acta

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International audienceMollusk shells are increasingly used as records of past environmental conditions, particularly for sea-surface temperature (SST) reconstructions. Many recent studies tackled SST (and/or sea-surface salinity) tracers through variations in the elementary (Mg and Sr) or stable isotope (δ¹⁸ O) composition within mollusk shells. But such attempts, which sometimes include calibration studies on modern specimens, are not always conclusive. We present here a series of Mg and Sr analyses in the calcitic layer of Concholepas concholepas(Muricidae, Gastropoda) with a very high time-resolution on a time window covering about 1 and a half month of shell formation, performed by Laser Ablation Inductively-Coupled Plasma Mass Spectrometry (LA-ICP-MS) and electron probe micro-analysis (EPMA). The selected specimen of this common Chilean gastropod was grown under controlled environmental conditions and precise weekly time-marks were imprinted in the shell with calcein staining. Strontium variations in the shell are too limited to be interpreted in terms of environmental parameter changes. In contrast, Mg incorporation into the shell and growth rate appear to change systematically between night and day. During the day, Mg is incorporated at a higher rate than at night and this intake seems positively correlated with water temperature. The nightly reduced Mg incorporation is seemingly related to metabolically controlled processes, formation of organic-rich shell increments and nocturnal feeding activity of the animals. The nyctemeral Mg changes in the C. concholepas shell revealed in this study might explain at least part of the discrepancies observed in previous studies on the use of Mg as a SST proxy in mollusk shells. In the case of C. concholepas, Mg cannot be used straightforwardly as a SST proxy

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Statistical control and optimization of X-ray intensity measurements

Cited by 35 publications

References 18 publications

Temperature effects on the calcite skeletal composition of deep-water gorgonians (Isididae)

Temperature effects on the calcite skeletal composition of deep-water gorgonians (Isididae)

Characterization of plutonium distribution in MIMAS MOX by image analysis

Nyctemeral variations of magnesium intake in the calcitic layer of a Chilean mollusk shell (Concholepas concholepas, Gastropoda)

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