During the preparation of ? S r titanate sources, the general purpose high activity cell line at A.E.R.E., Harwell became heavily contaminated, resulting in surface beta dose-rates up to lo5 rad/hr. Some remote cleaning was done, but for effective decontamination, controlled cell entries were made by operators.The report describes the methods used to assess the hazards to persons entering the cell-line, to prevent the spread of surface and airborne contamination from the cell-line, and to control the radiation exposure of the personnel employed. Of the approximately 250 men employed, who between them made about 440 cell entries, only 18 received surface doses in excess of the relevant permitted 13 week level, and none took a significant amount of radioactive material into his body.The necessity for wearing an array of dosimeters on the body when working in beta radiation fields is demonstrated.An attempt was made to use the large numbers of results (9000 thermoluminescent dosimeters and 2000 film dosimeters) to provide information on the relative performance of the dosirneten under difficult operational conditions. Thermoluminescent dosimeters generally under-read compared to film dosimeters by 10%-34% depending upon the position on the body, although in the overexposure cases it was noted that this was so only in eight of the nineteen comparisons made. The possible causes of these variations are discussed in detail.
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