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In this paper, we simulate the exposure factor by a simple model of a
free-air ionization chamber with the Monte Carlo programme Geant4.
Special emphasis is placed on the discussion of the exposure
factor related to parameters of the chamber model. The reason for the
variation in exposure factor with incident ray energy is also
analysed in terms of reaction cross section for different types of
reactions. The obtained results indicate that our simulation is
accurate in the calculation of the exposure factor and can serve as
a reference in designing air ionization chambers. 相似文献
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