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activity addition amount Atomic Energy Authority average Board body bone Broadcasting carbon carried cells cent changes Commission Committee considerable contamination continued contribution Council depends deposited direct dose dose-rate effects elements established estimated experiments explosions exposure external fall-out field fission fuel further genetic give given Group half-life Home houses human important increase industrial interest International irradiation isotopes less leukaemia limited London March materials maximum mean Measure Medical milk natural nuclear observed obtained occur Office operation pension period permissible persons plant population possible present problems programmes Protection radiation radioactive range reactor received recommendations recorded Regional Research schools Scotland shows sound sources staff stations strontium 90 television tests tissue types United Kingdom uranium various whole