Abstract
From the beginning of X-ray work the ionisation chamber has been employed almost universally amongst physicists as a means of measuring X radiation. In spite of some experimental inconveniences it is becoming more and more the standard measuring instrument in medical radiology also. Its importance has now been emphasised by the International X-ray Unit Committee, who propose to define the unit dose in terms of the ionisation produced by the radiation in a cubic centimeter of air. Their selection of the ionising power of the radiation as a practical basis for its measurement is entirely to be commended both on practical and theoretical grounds. It is the property which can be most accurately and conveniently measured, and it is the property which we can hope, with most certainty, to relate to that which we really wish to measure—the energy of the radiation.
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