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An ionization chamber operated at pressures of up to 3 atmospheres of argon has been used to measure energy fluence by totally absorbing various X-ray beams generated between 10 kV and 30kV. Comparison of the response of a total absorption calorimeter (Greening, Randle and Redpath 1968, Phys. Med. Biol., 13, 359) with that of the ionization chamber has shown that the average energy required to form an ion pair in argon is 26·36±0·17 eV, with no significant variation over the energy range investigated. The saturation of the ionization chamber has been investigated, and attention is drawn to its precision and sensitivity.
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Greening et al. (1968) studied this question.
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