Consideration is given to the choice of the formula which best describes recombination between parallel plates. This formula is modified so that it may be applied to free-air ionization chambers. The modifications entail determining (i) the effective width of a circular cross-section X-ray beam, (ii) the effect of space charge and (iii) the effect of ion spread and distribution. The modified formula is checked experimentally with a small free-air chamber by varying field strength, dose-rate, beam quality and size and shape of the X-ray beam. Good confirmation is obtained.
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Scott et al. (1961) studied this question.
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