Revision of I131 Standard for A.E.R.E. Supplies

Following the review* of the British standard of activity for the radioisotope I131, the new standard will be used for dispensing I131 supplied by A.E.R.E., Harwell, as from January 1, 1953. The provisional M.R.C. standard, set up by Gray, which has been used for the assay of all consignments supplied by A.E.R.E. from the beginning of 1949 until the present time, will be used for supplies dispensed up to midnight on December 31, 1952.