The design of a miniature condenser ionization chamber for the measurement of diagnostic X-ray exposure dose is described. Response relative to the roentgen as a function of energy for X-rays with a range of half value layers from 0.2 to 5.0 mm Al (effective energies of 12.8 and 41.5 keV, respectively) is kept constant by the correct choice of chamber dimensions and by constructing the chamber entirely of material of lower atomic number than that of air. Measured values of sensitivity and directional dependence are presented together with the calculated maximum dose rate. The chambers can be made in large numbers by a molding technique with completely reproducible properties.
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Garrett et al. (1959) studied this question.