Effect of EXAFS on the dosimetric related parameters

What is it about?

Mass attenuation coefficients have been measured for rare earth compounds at photon energies 8.041, 8.907 and 13.347 keV. The measured values are compared with theoretical calculations. The agreement between experiment and theory is more than the experimental error when the incident photon energy is around the edge of the element present in the compound and agreeing with the theoretical values elsewhere. The difference in agreement between the theoretical values and experimental values is attributed to the EXAFS effects on the mass attenuation coefficient values.

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Why is it important?

low photon energy region say that up to 15 keV the effective atomic number can be determined with greater accuracy but one should take into account of edge effects.The electron density of the dosimetric materials is calculated using the experimental Zeff values and found to vary 0.478 to 0.676 (1024 electrons g–1). In conclusion, the determined Zeff value is agreeing with the theoretical values within 5% at this energy range and one should also take care of effects if high atomic number dosimeters are involved.

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