nm ae [=P re 97 , Be re Bai iv e a . a Resuits. Since no correetions have dcecn made for racioactive potassium normally present in fish tissics, oricntation regarding wrc significance of the radioactivity reeorded must be obtained by refcrence to the control values. In Table 5 arc asscmbled some of the readings on the edible white meat of the radioactive tuna in comparison with controls. ‘hile the amount of data is probably too small fer statistical evaluation, tnerc is indication that the raw flcsh docs contain 4 small excess of radioactivity over that of the controls, but this is lost in the process of cooking and canning. if this is so, then the markcd activity of the exudate (Table 3) may be a partial explanation. It is believed that the cxudate reprcsents a "cooking out" of minerals some of which (potassium included) may be radioactive. Support for this argument may also be noted in that loss of activity by cooking is only 20% when expressed on the basis of the wet weight but 40% when expressed on the basis of tue asn weignt. Generally, it ean be stated that tne processed flesh of the "radioactive" tuna does not contain significant amounts of activity over that of control tuna. Referring to Table 3 showing analyscs cf eanned samplcs from different locations on the fish, it is evident that distribution of radioactivity does not foliow any significant trend, <nd is uniform. In order to asscss the significance of the radioactivity mcasured in other tissues of the fish, comparable control tissues would, of coursc, also have to be analyzed. Refercnec to Tablcs I and II shows nevertheless that some of the other tissues, notably skin, gill, ete., did have significantly higher values than the edible flesh. Contrary to expectations, however, no Significantly high "standout" values for bonc arc recorded. Conclusions: (1) There is a small but significant clevation of radioactivity (2) Processing of the cdible flesh reduced the radioactivity to the (3) in the raw import sample of yellow fin tuna. same level as that of the controls. Considering the low levcls of radioactivity involved, therc is no question of injury to hcaith from ingesting the canned meat.