Preprints
https://doi.org/10.5194/angeo-2020-77
https://doi.org/10.5194/angeo-2020-77

  08 Dec 2020

08 Dec 2020

Review status: this preprint has been withdrawn by the authors.

Requirement of HE-PIXE at High Z Elements in Charnockite Matrix Composition

Avupati Venkata Surya Satyanarayana1, Mokka Jagannadha Rao2, and Byreddy Seetharami Reddy3 Avupati Venkata Surya Satyanarayana et al.
  • 1Department of Engineering Physics, Andhra University, Visakhapatnam-530003, AP, India
  • 2Department of Geology, Andhra University, Visakhapatnam-530003, A.P, India
  • 3Department of Nuclear Physics, Andhra University, Visakhapatnam-530003, AP, India

Abstract. The maximum of Proton Induced X-ray Emission analytical technique on metamorphic rocks in geology has used 3 MeV range proton beams for excitation of thick targets. Protons of such energies do not accurately excite K-X–rays for high Z elements in matrix geological compositions like charnockite. In this analysis, low-energy PIXE (LE-PIXE) uses K-X-rays of Low Z elements and L-X-ray series for high Z elements. The resulting spectra between K-X-rays of light elements and L-X-rays of heavy elements can require striping techniques to resolve overlap difficulties in matrix composition. The results high Z elements in charnockite are to be expected, as the cross section for K-shell ionization of high-Z elements have greater values in the proton energy range of greater than 3 MeV in case of charnockite matrix composition. It has been suggested that the overlap of these discrete, gamma-rays with the X-ray spectrum may be serious problem in charnockite high energy PIXE (HE-PIXE) work, sufficient to preclude its use as a viable analytical technique. The conclusion proves that for a very complex matrix charnockite material of unknown chemistry, a HE-PIXE analytical spectrum may contain various X-ray and gamma peaks, some of which may overlap, making the analysis of line identities and the evaluation of X-ray counts intractable. It does not however represent any intrinsic drawback in HE-PIXE, nor does it mean that HE-PIXE is any more or less intractable than many other nuclear analytical techniques. Alternatively, the same analytical tool use could be made of gamma-rays in HE-PIXE as in low energy analytical tools like PIGE, NRA or INAA to obtain the results of charnockite at high Z completely.

This preprint has been withdrawn.

Avupati Venkata Surya Satyanarayana et al.

Interactive discussion

Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement

Interactive discussion

Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement

Avupati Venkata Surya Satyanarayana et al.

Avupati Venkata Surya Satyanarayana et al.

Viewed

Total article views: 433 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
396 32 5 433 4 4
  • HTML: 396
  • PDF: 32
  • XML: 5
  • Total: 433
  • BibTeX: 4
  • EndNote: 4
Views and downloads (calculated since 08 Dec 2020)
Cumulative views and downloads (calculated since 08 Dec 2020)

Viewed (geographical distribution)

Total article views: 400 (including HTML, PDF, and XML) Thereof 398 with geography defined and 2 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Latest update: 23 Jul 2021
Download

This preprint has been withdrawn.

Short summary
This study of the possibility of low energy-PIXE (3 MeV) applied to the higher Z elements of high grade metamorphic rocks, including Si (Li) detector is exactly valid or not for future studies. The experimental factors like incident energy, production cross sections, detector etc, behind the important high Z of matrix rocks by LE-PIXE are discussed and also the modifications which will be required at high Z elements like HE-PIXE or complementary methods.