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You searched for subject:(Mass attenuation coefficient). Showing records 1 – 3 of 3 total matches.

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1. Shantappa, Anil. Studies on effective atomic numbers and electron densities of some biological and organic compounds; Effective atomic numbers and electron densities of some biological and organic compounds.

Degree: Physics, 2015, Gulbarga University

The study of interaction gamma rays and X rays with different materials has newlinegained great importance and finds wide application in areas such as medicine newline

Bibliography p.197, Appendix p.206

Advisors/Committee Members: Hanagodimath, S M.

Subjects/Keywords: Attenuation coefficient; Mass attenuation coefficient

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APA (6th Edition):

Shantappa, A. (2015). Studies on effective atomic numbers and electron densities of some biological and organic compounds; Effective atomic numbers and electron densities of some biological and organic compounds. (Thesis). Gulbarga University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/36489

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Shantappa, Anil. “Studies on effective atomic numbers and electron densities of some biological and organic compounds; Effective atomic numbers and electron densities of some biological and organic compounds.” 2015. Thesis, Gulbarga University. Accessed December 18, 2017. http://shodhganga.inflibnet.ac.in/handle/10603/36489.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Shantappa, Anil. “Studies on effective atomic numbers and electron densities of some biological and organic compounds; Effective atomic numbers and electron densities of some biological and organic compounds.” 2015. Web. 18 Dec 2017.

Vancouver:

Shantappa A. Studies on effective atomic numbers and electron densities of some biological and organic compounds; Effective atomic numbers and electron densities of some biological and organic compounds. [Internet] [Thesis]. Gulbarga University; 2015. [cited 2017 Dec 18]. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/36489.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Shantappa A. Studies on effective atomic numbers and electron densities of some biological and organic compounds; Effective atomic numbers and electron densities of some biological and organic compounds. [Thesis]. Gulbarga University; 2015. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/36489

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


University of Guelph

2. Heirwegh, Christopher Michael. Studies of Light Element X-Ray Fundamental Parameters Used in PIXE Analysis .

Degree: 2014, University of Guelph

New measurements of fundamental parameters (FP), used in reference-free particle induced X-ray emission (PIXE) analysis of materials, may be assisted by incorporating both state-of-the-art spectral processing methods and methodologies that have minimal reliance upon other FPs. Under this heading, several light element FPs have been investigated. A collection of monochromatic spectra[73] have been characterized in terms of the origins and lineshapes of features arising due solely to photon and electron interactions in the silicon detector crystal. Through the assistance of Monte Carlo simulation results, state-of-the-art fit treatments were applied to these spectra using a fit routine that combined both non-linear least squares and manual optimization. The fitted spectra were used to derive a new estimate of the K X-ray fluorescence yield (ωK) of Si. This was done using a geometrical expression that relates ωK to the area ratio of the escape to primary peaks taken from the spectra. The final result (0.0504 ± 0.0015) was realized through assistance from new low energy mass-attenuation coefficient (MAC) data. The accuracy of low-energy (1–2 keV) MACs of light elements was assessed using an approach incorporating PIXE measurements on pure element (Mg, Al and Si) and oxide (MgO, Al2O3 and SiO2) targets. Calculated spectrometer efficiency constants, compared between target pairs (eg, Si vs. SiO2), allow many FPs to cancel. Any non-zero difference in the comparison indicates errors associated with the remaining FPs. A resultant 4–6% discrepancy was attributed to the use of XCOM[10] MACs but this was reduced to 0.5–2.5% using FFAST[33] MACs. Additional measurements, performed on silicate micro-probe standards, were analyzed using the same comparative approach. A light element efficiency-constant discrepancy of 7–9% was observed and attributed to the use of XCOM MACs. This was reduced to 0.5–3.5% using FFAST MACs but was reduced further to −0.5–2% using a combination of XCOM and FFAST MACs. This result suggested that the combination database was superior. Advisors/Committee Members: Campbell, John L. (Iain) (advisor).

Subjects/Keywords: PIXE; X-ray; emission; fluorescence yield; detector; response function; light element; FFAST; XCOM; mass attenuation coefficient; fundamental parameters

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Heirwegh, C. M. (2014). Studies of Light Element X-Ray Fundamental Parameters Used in PIXE Analysis . (Thesis). University of Guelph. Retrieved from https://atrium.lib.uoguelph.ca/xmlui/handle/10214/8115

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Heirwegh, Christopher Michael. “Studies of Light Element X-Ray Fundamental Parameters Used in PIXE Analysis .” 2014. Thesis, University of Guelph. Accessed December 18, 2017. https://atrium.lib.uoguelph.ca/xmlui/handle/10214/8115.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Heirwegh, Christopher Michael. “Studies of Light Element X-Ray Fundamental Parameters Used in PIXE Analysis .” 2014. Web. 18 Dec 2017.

Vancouver:

Heirwegh CM. Studies of Light Element X-Ray Fundamental Parameters Used in PIXE Analysis . [Internet] [Thesis]. University of Guelph; 2014. [cited 2017 Dec 18]. Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/8115.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Heirwegh CM. Studies of Light Element X-Ray Fundamental Parameters Used in PIXE Analysis . [Thesis]. University of Guelph; 2014. Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/8115

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


University of Melbourne

3. de Jonge, Martin D. High-accuracy measurements of the x-ray mass attenuation coefficients of molybdenum and tin: testing theories of photoabsorption.

Degree: 2005, University of Melbourne

The x-ray atomic form-factor determines the x-ray optical properties of materials and is a fundamental parameter for critical x-ray investigations. However, despite uncertainty estimates of order 1%, differences of 2-10% between x-ray mass attenuation measurements render comparison with the various theoretical tabulations meaningless. Moreover, such uncertainties impose limits on the accuracy of various quantitative investigations. We determine the imaginary component of the atomic form-factor from measurements of the x-ray mass attenuation coefficient. With the exception of the measurements of Tran et.al. [Phys. Rev. A 64, (062506); 67, (042716); J. Phys. B 38, (89)] with a 0.3% accuracy, previous work has been unable to achieve accuracies below 1%, and differences between results claiming this accuracy often exceed 6%.We have developed a full-foil mapping technique which has improved the measurement accuracy by an order of magnitude. This technique overcomes limitations arising from absorber thickness variations, using the average integrated column density and attenuation measurements across the entire surface of the absorber. We have examined measurements obtained over a wide range of parameter space for systematic deviations indicative of experimental error. Among others, this has led to the identification and correction of a 1% discrepancy arising from the x-ray bandwidth. Resulting measurement accuracies for molybdenum are 0.02-0.15%. Preliminary results for tin suggest a final accuracy of 0.1-1%. We compare these measurements with several commonly-used tabulations and identify a number of systematic discrepancies whose causes are discussed.

Subjects/Keywords: X-ray extended-range technique (XERT); mass attenuation coefficient; x-ray atomic form factor

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

de Jonge, M. D. (2005). High-accuracy measurements of the x-ray mass attenuation coefficients of molybdenum and tin: testing theories of photoabsorption. (Doctoral Dissertation). University of Melbourne. Retrieved from http://hdl.handle.net/11343/39115

Chicago Manual of Style (16th Edition):

de Jonge, Martin D. “High-accuracy measurements of the x-ray mass attenuation coefficients of molybdenum and tin: testing theories of photoabsorption.” 2005. Doctoral Dissertation, University of Melbourne. Accessed December 18, 2017. http://hdl.handle.net/11343/39115.

MLA Handbook (7th Edition):

de Jonge, Martin D. “High-accuracy measurements of the x-ray mass attenuation coefficients of molybdenum and tin: testing theories of photoabsorption.” 2005. Web. 18 Dec 2017.

Vancouver:

de Jonge MD. High-accuracy measurements of the x-ray mass attenuation coefficients of molybdenum and tin: testing theories of photoabsorption. [Internet] [Doctoral dissertation]. University of Melbourne; 2005. [cited 2017 Dec 18]. Available from: http://hdl.handle.net/11343/39115.

Council of Science Editors:

de Jonge MD. High-accuracy measurements of the x-ray mass attenuation coefficients of molybdenum and tin: testing theories of photoabsorption. [Doctoral Dissertation]. University of Melbourne; 2005. Available from: http://hdl.handle.net/11343/39115

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