> as lemmas

1957 Proc. Royal Soc. A. 241 495 Many polyesters can be fully cured with a dose of only a few megarads.

1960 A. Charlesby Atomic Radiation & Polymers iv. 65 A reactor running at 100 megawatts power output could provide 30 megarads to 1 ton of material.

1994 Internat. Orthopaedics 18 172 It is recommended that bone allografts which are secondarily sterilized by gamma irradiation receive at least 2.5 megarads.