Organs or tissues Skin Rats ~ Biijirt n thousands 6. Muscle Bone 6 | 6 Liver Digestive tract Lung Shore birds - Rojoa a/m/g in n 9.2 thousands 2 0.94 17. 2 2 6 1.9 2 12 8.1, 6 6 d/m/g in 1.0 Ratio of d/m/g of shore birds to rats 19. 2.06 0.63 7.6 0.67 0.45 1.32 2.5 7.04 57. 2 0.86 0.87 Only ia the activity of the digestive tract do the two forms differ by more than a factor of three, also the differences are not consistently in favor of either of the forms. Differences in activity levels between birds of different feeding habits were found. . Average values for the shore birds of the Rojoa-Aaraanbiru area and those for the terns Aaraanbiru srea are as Organs or tissues follows: Terns ~ Aaraanbiru d/m/g in Shore birds - Rojoa d/m/g in n thousands Skin 2 1.1 0.36 0.86 3 3 Liver 2 0.78 3 6 2.1 9 Muscle Bone. 2 2 Digestive tract in the n 3 thousands 17. 1.1 4.0 HOS . 76. Shore birds and rats appear to be more alike Ratio of d/m/g of shore birds to terns 15.45 3.05 4.65 5.77 36.18 in relation to uptake of radioactive materials than do the shore birds and terns. It appears likely, however, that the shore birds and rats are different regarding retention of radioactive materials - 72 - DOE FRO ATS