Abstract
Just 25 years ago, in January 1951, this Journal published the current recommendations of the International Commission on Radiological Protection. That document of eight pages included a four-page supplement on “Maximum Permissible Amounts of Radioactive Isotopes” (ten were considered) with a two-and-a-half page appendix on Standard Man—mass of organs, chemical composition and applied physiology. Reference Man is a descendant from his puny predecessor, via two more extensive reports in 1954 and 1959, but it is reassuring to know that he still weighs 70 kg, and his thyroid 20 g, although his liver and pancreas have enlarged from 1,700 to 1,800 and 70 to lOOg respectively, and his brain has shrunk from 1,500 to 1,400 g.
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