Abstract
An account is given of errors which have been revealed in the primary standard free-air chamber of N.P.L. and of the effect of these errors on clinical dosimetry in Great Britain. Inconsistencies in clinical dosemeters are discussed and the desirability of radioactive checks for secondary standard instruments is emphasised. Some details of the new N.P.L. free-air standard are presented, together with the preliminary results of an intercomparison with the standard chamber of N.B.S. The major sources of error in free-air chamber dosimetry are discussed and the conclusion reached that an absolute accuracy of better than ±1 per cent is difficult to achieve in the conventional therapy region. Possible methods of standardising dosemeters in the highenergy (2 MeV) region are described and attention is drawn to the desirability of further work being done on the γ-ray output from radium and on the stopping power relative to air of materials suitable for cavity chambers.
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