HC Deb 07 March 1990 vol 168 cc703-4W
Mr. Andrew F. Bennett

To ask the Secretary of State for Defence if he will publish in theOfficial Report the upper quartile range of maximum radiation doses rates sustained by workers at (a) the Atomic Weapons Establishment Aldermaston, (b) Plymouth, Devonport and (c) Rosyth for each of the last five years for which figures are available.

Mr. Archie Hamilton

The figures requested are given in tables 1 and 2, based on the interpretation of upper quartile as the range of doses to which the most highly exposed 25 per cent. of the workers are subjected. The lowest dose of the upper quartile range cannot be readily identified for the royal dockyards (table 1) due to the way the figures are compiled. Both for AWE and the royal dockyards, however, the vast majority of exposures are much less than 15mSv.

Table 1
Uppermost Quartite Data for Exposures to External Irradiation for the Royal Dockyards, including data for workers of the Contractors (Devonport Management Ltd. and Babcock Thorn) after 1987
Year Dose Range (mSv)
1985 <15–50
1986 <15–40
1987 <15–55
1988 <15–30
1989 <15–50
Table 2
AWE Uppermost Quartile Data for Exposures to External Irradiation
Year Dose Range (mSv)
1984 0.7–15
1985 0.8–20
1986 0.8–15
1987 0.7–15
1988 0.8–10