Discusses the report of the National Academy of Science Committee on the Biological Effects of Ionizing Radiation, with particular reference to the possibilities for lowering maximum permissible standards for exposure to man-made radiation. The excessive use of diagnostic X-rays is considered. (AL)

Proposes seven rules to guide rational determination of permissible levels of air, water, and food contaminants to avoid unwarranted banning" and unreasonable economic and social costs. (AL)

Despite the suggested link between cancer deaths and drinking obtained from the Mississippi River, New Orleans still treats its water supply in the same manner as before the Environmental Defense Fund's epidemiological study. (BT)

It is suggested that a system of relative standards be formulated which would compare utility of substances to their relative risk as carcinogens. This would define a range of use restrictions. Substances intended for specific uses would then be regulated according to these standards. (Author/RE)