Question

X 20,
UNIT-III
0758 0.842
Ifr,12.3=0.80,1,3 =-0.56,12 =-0.40 then obtain rız; and R, 23"
muth in 75 percent and B in 80 percent of the cases. In​

Answer 1

Answer:

Answer:X-ray attenuation in samples of pure elements and mixtures of elements. The emphasis is on the energy range 30–150 keV although the energy regions 10–30 and 150–1000 keV are also discussed. The approximations involved in deriving several well known formulae for the photoelectric and scattering cross-sections are described and the accuracy of these formulae is assessed. More accurate formulae are derived by reference to fundamental theory. It is shown that definitions of such quantities as effective atomic number cannot be justified from fundamental theory. The consequences of this result are explored in relation to various experimental conditions and the physical parameters of a complex medium which can be determined by X-ray transmission measurements are identified. Connections with related areas of interest in atomic physics and low energy X-ray scattering are made.

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