- 54 elements of nutrition, as well as the elements always present in man but of unknown function (Heinz Company 1958). These are not the only elements found in man, at times barium, boron, cesium, lead, lithium, however, as rubidiun, strontium, tin and titanium also may be present. Some of these elements may be of importance to the well-being of the individual but the presence of most of them is probably fortuitous, Also listed in Table IV as part C are elements with radioisotopes that occur in fallout, but the elements of fallout -- such as zirconium, ruthenium, niobium, rhodiun, praseodymium and promethium -- for which there is little or no data concerning their abundance in sea water or in fish muscle are excluded. Also excluded from Table IV, because of the uncertainty of their oceurrence in sea water, are the padioisotopes that might be present from the operation of nuclear-powered ships or from the disposal of radioactive wastes. Isotopes that may be discharged to the sea from the operation of nuclear-powered ships in addition to those listed in Table Iv are or21, cu®4, urt75 ana tal82 (NaS-NRC 658). The radioisotopes that would be expected to be found in the sea from the disposal of radioactive waste and their maximum permissible concentration factors in fish are