A Thick-walled Ionization Chamber for Measuring the Intensity of X-Radiation of Energy up to 25 MeV

A thick-walled ionization chamber suitable for measuring the radiation intensity from synchrotrons and betatrons operating at energies up to 25 MeV is described. Calibration curves giving the current in the chamber per incident photon as a function of photon energy are given The effect of wall thickness and secondary x-rays produced in the wall have been considered and included in the calculations Experimental results consistent with the theory are described.