Measurement of total photoelectric cross‐sections for 52.4 keV photons

Jahagirdar, H.A.; Hanumaiah, B.; Thontadarya, S.R.

doi:10.1002/xrs.1300220310

Cited by 3 publications

(1 citation statement)

References 9 publications

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“…Several researchers have used these methods for measuring the K shell photoelectric cross section [4][5][6][7] and have compared their results with theoretical values predicted by Scofield [8] and Hubbell [9].…”

Section: Introductionmentioning

confidence: 99%

Measurement of K shell photoelectric cross sections at a K edge—a laboratory experiment

Nayak¹,

Badiger²

2007

Eur. J. Phys.

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We describe in this paper a new method for measuring the K shell photoelectric cross sections of high-Z elemental targets at a K absorption edge. In this method the external bremsstrahlung (EB) photons produced in the Ni target foil by beta particles from a weak 90Sr-90Y beta source are passed through an elemental target and the spectrum of transmitted EB photons is measured with a HPGe detector coupled to a 2K ORTEC multichannel analyser spectrometer. The measured spectrum shows a sharp decrease in transmitted intensity at the K absorption edge of the element. Such a sharp decrease is used to determine the K shell photoelectric cross section at the K edge as well as the K absorption edge of the element. We report the data for Gd, Hf, Ta, Au and Pb targets.

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Section: Introductionmentioning

confidence: 99%

Measurement of K shell photoelectric cross sections at a K edge—a laboratory experiment

Nayak¹,

Badiger²

2007

Eur. J. Phys.

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Contributions of double interaction processes to x‐ray fluorescence intensity

Tirao

Stutz

2003

X-Ray Spectrometry

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An algorithm for calculating the contribution of double x-ray interaction processes to the primary fluorescence emission is described. Four second-order processes including one scattering event (elastic or inelastic) and one photoelectric absorption were considered. Compton scattering events were more accurately described than in previous work by using a relativistic double-differential cross-section, which takes into account binding energy effects as well as momentum distribution of electrons of all atomic orbitals. Calculations of the contribution of double interaction processes were performed considering various experimental conditions (different sample thicknesses, atomic numbers, incident and outgoing angles and incident photon energies). The results show that for energies ranging from a few tens of keV up to 120 keV scattering contributions to the Ka 1 fluorescence line vary from ∼1% to several tens of percent (exceeding 50% for light elements). The relative scattering contribution is a rapidly increasing function of the sample thickness and reaches a saturation regime at a thickness of the order of the mean free path of the photons. The saturation value depends on the photon energy. Considerable deviations from a previous theoretical formalism were found. This discrepancy must be attributed to a more realistic description of single scattering events included in the present formalism. The present results are in very good agreement with those calculated from the transport theory.

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Total photon cross sections for low energy photons in light elements

Murty¹

2001

Radiation Physics and Chemistry

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Measurement of total photoelectric cross‐sections for 52.4 keV photons

Cited by 3 publications

References 9 publications

Measurement of K shell photoelectric cross sections at a K edge—a laboratory experiment

Measurement of K shell photoelectric cross sections at a K edge—a laboratory experiment

Contributions of double interaction processes to x‐ray fluorescence intensity

Total photon cross sections for low energy photons in light elements

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