8 BOOGOT ANALYSES CE YELLOW Fil) TUNA @ FISH TISSUES FOR R’.ICACTIVITY - eele cea The following report gives analyses of the *issues of a yellow fin tuna fish obtained from a Japanese import by Los angeles District in May 195l. This fish was one of two shown to be slightly radioactive when surveyed with a portable Beta-Gamma meter. it was reeeived at the laboratory in 2 frozen state and had been previously degutted and degilled. Samples for analysis of radioactivity were taken (1) from the raw fish, (2) after precooking, (3) after canning. Pracessing of the fish was carried out.in the laboratories Procedure: of the National Canners ‘Association-“in: collaboration with’ Dr. James Reed. 1. Tuna was brought to“Nod Laboratories on"Monday, July 26, ina 2. On Tuesday, July 27, the tuna, approximately 50 inches long was - frozen state and permitted to thaw overnight at room temporature. “¢ : gut into, head and tail sections respectively 29 and 21 inches. This procedure, comparable tw standard canning practice, was necessary.to accommodate the fish to. the cooking basket. At this time portions of the edible and inedible tissues were taken. for analyses... 3., The sections of fish were placed in two galvanized wire baskets 30" long and 16" wide and precooked in steam at 220°F to 225°F for 5 hours to a temperature of 145 to 160°F recorded on a thermometer inserted to the level of tue vertebral column. . Daring cooking, a mixture of steam -condensate. and judees: from the fish was collected. The total. liauid amounting to:6725 ml. Was concentrated and yielded approximately 7 gms. solids. An _ aliquot was taken for analysis. 5. The precooked sections were cooled at room temperature overnight. On Wednesday, July 28, they were cleaned, the edible seetions. separated and prepared for canning. At this time edible and inedible :portions: of the precooked fisn. were taken for analysis. pO eg SE 6. Canning was done as ‘follows: | . . . se an oe, foe Can Size: #2 fleet (397, x 20)| piri-inY Weer, 7. to 7 O%e_ ne | . Fillein Salt: 4 oz. yo tS ; ay oa Pooat boat aw ih So Pees 2 REnGotton.‘Seed ‘Oils. 1052 fl. Eeos hae ‘Cans’were sealed under ocn | auge vacuum and prowessed: ats. 20°F in steam for 85 minutes, followed oy water cooling.