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UPSC Combined Geo-Scientist

Chemist

  • 3 descriptive papers
  • 200 marks each
  • 3 h per paper

Mains Paper III covers analytical and organic chemistry.

UPSC Combined Geo-Scientist, Mains · 2017 · Mains Paper III

Q2(c). X-ray fluorescence

Question

Explain XRF, its qualitative and quantitative uses, and order the K, L and M characteristic X-rays of Au by energy.

Answer in brief

Primary radiation creates inner-shell vacancies; characteristic fluorescence identifies elements, and calibrated intensities determine their amounts. For Au, EK>EL>EM.

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CoversX-ray fluorescenceX-ray spectroscopy

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