Abstract
It is proposed that existing primary standards of exposure continue to be operated as at present; in-air comparison of secondary standards will be used to determine an exposure calibration, quoted in the SI unit C kg-1. A derived calibration factor for absorbed dose will be supplied for use with the secondary-standard chamber in a water phantom under specified conditions. Secondary-standardizing laboratories will be able to calibrate field instruments, scaled in grays, in terms of absorbed dose to water under reference conditions appropriate to the particular radiation quality.

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