Si(Li) Detector efficiency below 10 keV

Barfoot, K.M.; Mitchell, I.V.; Avaldi, L.; Eschbach, H.L.; Gilboy, W.B.

doi:10.1016/0168-583x(84)90014-4

Cited by 17 publications

(6 citation statements)

References 36 publications

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“…Figure 8 shows the reduced cross sections as given in Eq. (14) along with the universal function (solid line) F(gsz /A) plotted against the reduced variable gttz /A. The agreement between the experimental data and the theory over the entire energy range is reasonably good.…”

Section: Semiclassical Approximation (Sca)mentioning

confidence: 68%

“…The corresponding ratio R between the experimental data and the theoretical values is plotted in Fig. 5 (14). The universal function [Eq.…”

Section: Semiclassical Approximation (Sca)mentioning

confidence: 99%

“…This cross section is given by [11] o'* =A [I+rg(g )]xFc F(patt/A) . 0 (13) Accordingly the scaled cross sections can be expressed as 1scr p expt A'[1+ rg (4 ) ]'Fc~o re (14) 2'…”

Section: Molecular Orbital (Mo) Approachmentioning

confidence: 99%

“…The absolute eSciency at different energies was obtained using the known intensity of the emitted x-rays and y rays [14] and is shown in Fig. 1.…”

Section: Introductionmentioning

confidence: 99%

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K-shell-ionization cross sections for low-Zelements (11≤Z≤22) by protons in the energy range 0.5–2.5 MeV

Tribedi

Tandon

1992

Phys. Rev. A

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EC-shell-ionization cross sections for Na, Mg, Al, Si, Cl, K, Ca, and Ti by protons in the energy range 0.5 -2.5 MeV have been measured using thin targets. Measurements have also been performed for thin targets of Fe, Ni, and Cu at a few energies. The energy range of protons for these targets corresponds to the reduced velocity {U1/U2&) range 0.2-1.1, in which the cross sections are very sensitive to the increased binding energy and the Coulomb-deflection effects. The measured ionization cross sections are compared with the predictions of the theory based on the perturbed-stationary-state approach including the Coulomb-deflection, energy-loss, and relativistic corrections. The data have been scaled according to various scaling laws to test the validity of the universal nature of the various Coulomb ionization theories based on the plane-wave Born approximation, the binary-encounter approximation, and the simplified semiclassical approximation model as given by La:gsgaard, Andersen, and Lund [in Proceed ings of the Tenth International Conference on the Physics ofElectronic and Atomic Collisions, edited by G. Watel (North-Holland, Amsterdam, 1978), p. 353]. The measured data have also been compared with the calculations of Montenegro and Siguad [J. Phys. B 18, 299 (1985)] based on the theory of lscr molecular-orbital ionization.

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Section: Semiclassical Approximation (Sca)mentioning

confidence: 68%

“…The corresponding ratio R between the experimental data and the theoretical values is plotted in Fig. 5 (14). The universal function [Eq.…”

Section: Semiclassical Approximation (Sca)mentioning

confidence: 99%

“…This cross section is given by [11] o'* =A [I+rg(g )]xFc F(patt/A) . 0 (13) Accordingly the scaled cross sections can be expressed as 1scr p expt A'[1+ rg (4 ) ]'Fc~o re (14) 2'…”

Section: Molecular Orbital (Mo) Approachmentioning

confidence: 99%

“…The absolute eSciency at different energies was obtained using the known intensity of the emitted x-rays and y rays [14] and is shown in Fig. 1.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

K-shell-ionization cross sections for low-Zelements (11≤Z≤22) by protons in the energy range 0.5–2.5 MeV

Tribedi

Tandon

1992

Phys. Rev. A

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“…First, we consider measurement of the detector efficiency of x-ray semiconductor detector used for x-ray production cross-sections. There are several efficiency measurements, for example, Barfoot et al [82], Tribedi and Tandon [83], Mohanty et al [75], Kumar et al [84]. It is shown there that efficiency for a high purity germanium (HPGe) detector can be known within 5% [85], for a Si(Li) detector within 6% [75], and expected to get similar accuracy for a silicon drift detector (SDD) [86].…”

Section: Suggestion On Making Accurate L Subshell Cross Section Measu...mentioning

confidence: 99%

Evaluation of accurate uncertainty of measurement in L subshell ionization cross-section

Singh¹,

Chatterjee²,

Mitra³

et al. 2021

Preprint

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To have a better understanding of a physical process, a comparison of experimental data with theoretical values is mandatory. The comparison is meaningful if the uncertainty in the experiment is accounted well. However, it is seldom seen, especially for a complex phenomenon. We take a test case through L subshell ionization of atoms by particle impact. Experimentally, x-ray production cross-sections are measured, but ionization cross-sections are calculated theoretically. Furthermore, the uncertainty of the x-ray production cross-section is mainly statistics and detector-efficiency driven. But ionization cross-section involves many other factors because of the relationship between the production and ionization cross section, having wide uncertainty spectrum. Consequently, determining the measurement uncertainty in L subshell ionization cross-section is always difficult. We have studied this issue in the simplest way, where the rule of weighted propagation of relative uncertainty is utilised. We notice that larger uncertainties are involved in atomic parameters relevant to L 1 (2s 1/2 ) subshell than those associated with the other two L 2 (2p 1/2 ) and L 3 (2p 3/2 ) subshells. Hence, comparison between theory and experiment would give higher emphasis on L 2 and L 3 subshell ionization cross sections. We believe this work aware us that the appropriate uncertainty evaluation is extremely important for providing the right judgment on the data.

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Determination of the solid angle of an Si(Li) detector

Hopman

Campbell

2002

X-Ray Spectrometry

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Radial and longitudinal scanning of x-ray detectors with a 55 Fe source is a widely used method for determining their dimensions and position within the cryostat and thence deducing solid angle in an analytical arrangement. The scanning method is refined here to take account of various effects and issues hitherto ignored and therefore reducing its accuracy; these include finite source size, collimator 'channelling,' and uncertainty as to the correction for x-ray attenuation in the intervening air. With proper attention to these effects, it is possible to determine the window-crystal distance to an accuracy of about 0.2 mm; this translates into an accuracy of about 3% for solid angle when the source-detector distance is about 25 mm. However, uncertainty remains in calibrating an analytical system, owing to lack of knowledge of the actual construction of any internal collimator.

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Si(Li) Detector efficiency below 10 keV

Cited by 17 publications

References 36 publications

K-shell-ionization cross sections for low-Zelements (11≤Z≤22) by protons in the energy range 0.5–2.5 MeV

K-shell-ionization cross sections for low-Zelements (11≤Z≤22) by protons in the energy range 0.5–2.5 MeV

Evaluation of accurate uncertainty of measurement in L subshell ionization cross-section

Determination of the solid angle of an Si(Li) detector

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