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Uncertainty budget for determinations of mean isomer shift from Mössbauer spectra

Fock, J; Bogart, LK; Posth, O; Hansen, MF; Pankhurst, QA; Frandsen, C; (2016) Uncertainty budget for determinations of mean isomer shift from Mössbauer spectra. Hyperfine Interactions , 237 , Article 23. 10.1007/s10751-016-1253-1.

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Abstract

The magnetite/maghemite content within iron oxide nanoparticles can be determined using the mean isomer shift (δ¯¯δ¯). However, accurate characterisation of the composition is limited by the uncertainty associated with δ¯¯δ¯. We have identified four independent sources of uncertainty and developed a quantitative expression for the uncertainty budget. Sources of uncertainty are categorised as follows: that from the fitting of the Mössbauer spectrum (σ fit), that of the calibration of the α-Fe reference spectrum (σ cal), thermal corrections to the spectrum due to second order Doppler shift (SODS) (σ Δδ ) and other experimental errors (σ err). Each contribution is discussed in detail using 57Fe Mössbauer spectra obtained from an iron oxide nanoparticle system at temperatures between 16 K and 295 K on different spectrometers in two different laboratories.

Type: Article
Title: Uncertainty budget for determinations of mean isomer shift from Mössbauer spectra
DOI: 10.1007/s10751-016-1253-1
Publisher version: http://dx.doi.org/10.1007/s10751-016-1253-1
Language: English
Additional information: The final publication is available at Springer via http://dx.doi.org/10.1007/s10751-016-1253-1.
Keywords: 57Fe Mössbauer, Uncertainty budget, Isomer shift, Second order Doppler shift
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Med Phys and Biomedical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/1497102
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