> as lemmas

1979 Nature 6 Sept. 6/2 The International Committee on Radiation Protection recommends that no member of the general public should be exposed for many years to an annual dose equivalent of more than 1 millisievert (mSv) a year.

1991 Atom Jan. 9/3 The fathers of four of the five leukaemia cases born in Seascale are known to have worked at Sellafield, and had received cumulative radiation doses of at least 97 mSv prior to conceiving.