§ Mr. D. E. Thomasasked the Secretary of State for the Environment if he will give the numbers of curies of plutonium-238, plutonium-239, plutonium-240, plutonium-241 and plutonium-242, separately for each isotope, discharged to sea from the Sellafield-Windscale plant during the period 1963 to 1982 inclusive.
§ Mr. WaldegraveDischarge figures for plutonium-238, plutonium-239 and plutonium-241 for the period 1963 to 1982 are contained in table 3.1 of the National Radiological Protection Board's report entitled "The risks of leukaemia and other cancers in Seascale from radiation exposure", reference NRPB-R171. Copies of this report are available in the Library of the House.
Prior to 1978 plutonium-238 was not separately analysed but it was included in the figure given in the table for plutonium-239. Plutonium-240 has never been separately analysed but it is included in the plutonium-239 figure. Plutonium-242 has at no time been analysed separately.