Abstract
In this paper the results of calorimetric measurements of the correlation factor erg/cm2 R for filtered and unfiltered X-radiation in the energy region up to 220 keV are given. The value of the correlation factor for X-radiation filtered by 3 mm Cu measured by a calorimeter is compared with the values of the correlation factor calculated by an independent method from the energy spectra of the same radiation. The initial spectra are obtained by means of a numerical graphical method from transmission curves measured by means of an ionization chamber in copper and tin.
This comparison has shown very good agreement between the calorimetric value of the correlation factor 3·-45. 103 erg/cm2 R and those calculated by using White's values of the correlation factor depending on the X-radiation energy, provided the average energy required to produce an ion pair in air is 34·0 eV. The experimental results thus obtained enable us also to evaluate the amount of average effective energy of the measured X-radiation which is equivalent to the energy of monochromatic X-radiation having the same correlation factor, in comparison with the effective energy, currently determined by ionization measurements of the half-value layers.
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The paper is dedicated to Professor F.Běhounek, Member of the Czechoslovak Academy of Sciences, on his 70th anniversary.
The authors wish to thank the head of the Laboratory, Academician F. Běhounek, for allround attention to this work, Ing. V. Bočková for valuable aid in the theoretical considertions and calculations, and J. Homola for setting up and performing the experiments.
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Kovář, Z., Handl, J. The accuracy improvement of the correlation factor erg/cm2R for low-energy X-radiation. Czech J Phys 18, 1390–1401 (1968). https://doi.org/10.1007/BF01691353
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DOI: https://doi.org/10.1007/BF01691353