Synchrotron light sources and radiation detector metrology

Owens, A.

doi:10.1016/j.nima.2011.11.077

Cited by 9 publications

(3 citation statements)

References 25 publications

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“…To determine the photon-nPR of scintillators, scintillation pulse height spectra at many finely spaced X-ray energy values between 9 keV and 100 keV at the X-1 beamline at the Hamburger Synhrotronstrahlungslabor (HASYLAB) synchrotron radiation facility in Hamburg, Germany were carried out. The scheme of the experimental set-up can be found in [1,26]. A monochromatic pencil X-ray beam was used as an excitation source.…”

Section: Experimental Methodsmentioning

confidence: 99%

Trends and Patterns of Scintillator Nonproportionality

Khodyuk

Dorenbos

2012

IEEE Trans. Nucl. Sci.

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Data on the photon nonproportional response of 33 inorganic scintillation materials are systemized and analyzed. The main trends of nonproportionality for different groups of inorganic scintillators, especially for oxides and halides, are highlighted. The dependence of the shape and degree of photon nonproportional response versus chemical composition, dopant type, refractive index and other fundamental properties of the materials is studied. Better proportionality appears to be correlated with higher refractive index of the compound. Another related factor is the width of the valence band in halide compounds. With larger valence band width from fluorides, to chlorides, to bromides, and to iodides, a better proportionality is observed.

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Section: Experimental Methodsmentioning

confidence: 99%

Trends and Patterns of Scintillator Nonproportionality

Khodyuk

Dorenbos

2012

IEEE Trans. Nucl. Sci.

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“…The brightness of a typical laboratory XPS instrument is on the order of 10 8 − 10 10 photons/ (s•mm 2 •mrad 2 •0.1% bandwidth) while the brightness of synchrotron generated light is on the order of 10 19 photons/ (s•mm 2 •mrad 2 •0.1% bandwidth). 46,47 It is presumed here that this increased brightness is responsible for reducing the ceria NC surface almost immediately upon exposure, which would account for the observed changes between the XANES and XPS spectra. Considering that smaller NCs have a larger surface contribution, these NCs would show a greater degree of damage over time.…”

Section: Resultsmentioning

confidence: 80%

Ceria Nanocubes: Dependence of the Electronic Structure on Synthetic and Experimental Conditions

Scott

Grosvenor

2013

J. Phys. Chem. C

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The properties of nanostructured ceria are both size- and shape-dependent. Here, ∼3–10 nm ceria nanocubes having exposed (002) surfaces were hydrothermally synthesized. For the first time, the electronic properties of such nanocubes were systematically studied using X-ray photoelectron spectroscopy and X-ray absorption spectroscopy. Comparisons of the collected Ce 3d XPS spectra after a single sweep revealed that the concentration of Ce3+ present within the nanocubes is independent of the particle size and the Ce precursor used. Ce 3d spectra collected after averaging 20 sweeps demonstrated the reduction of Ce4+, and that the degree of reduction was also independent of the synthetic conditions. This observed surface reduction/damage is mainly the result of exposure to high intensity X-ray radiation. These conclusions were further confirmed through examination of Ce M4,5- and N4,5-edge XANES spectra. On the basis of these results, it is clear that the concentration of Ce3+ on the surface of ceria nanocubes is independent of the particle size. This fact will become essential when designing new and improved catalytic support systems as the size of the nanocubes will not affect the surface concentration of Ce3+, and therefore may not affect their potential catalytic activity.

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“…Light sources of synchrotron radiation (SR) are powerful tools of fundamental and applied sciences due to their high photon flux and tunability, especially in the X-ray region. Thus, SR-based X-ray radiometry standard is important for related researches and applications [ 8 ]. The Physikalisch-Technische Bundesanstalt (PTB) has operated the Metrology Light Source (MLS) as a primary radiation source standard of radiant power from the near infrared radiation up to the soft X-ray region [ 9 , 10 ], and cryogenic electrical substitution radiometers (CESRs) as detector-based radiometry in the region from ultraviolet to hard X-rays [ 11 , 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

Comparison of X-ray Radiant Power Absolute Measurement between a Free-Air Ionization Chamber and a Cryogenic Electrical Substitution Radiometer

Yang

Wang

et al. 2023

Sensors

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Absolute measurement of radiant power in the X-ray region is essential for many applications in astrophysics, spectroscopy, and X-ray diagnostics. Comparison between different measuring methods is an effective way to check their reliability. In the present work, a comparison of X-ray radiant power absolute measurement between a free-air ionization chamber and a cryogenic electrical substitution radiometer was performed at Beijing Synchrotron Radiation Facility. The absolute radiant power obtained by these two methods were mutually compared via a transfer standard detector’s spectral responsivity at a photon energy of 10 keV. The result of the comparison showed that the difference was 0.47%. A conclusion was reached that the free-air ionization chamber and the cryogenic electrical substitution radiometer agreed within the combined relative uncertainty of 3.35%.

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Synchrotron light sources and radiation detector metrology

Cited by 9 publications

References 25 publications

Trends and Patterns of Scintillator Nonproportionality

Trends and Patterns of Scintillator Nonproportionality

Ceria Nanocubes: Dependence of the Electronic Structure on Synthetic and Experimental Conditions

Comparison of X-ray Radiant Power Absolute Measurement between a Free-Air Ionization Chamber and a Cryogenic Electrical Substitution Radiometer

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