231 served is generally true for the terrestrial case (though bearing in mind the anomalous Florida situation). The behavior of #7Cs in the aquatic case is somewhat different as illustrated by data from Red Lakes, Minnesota, shown in Figure 173. Again, the deposition rate and total accumulation are indicated along with annual (June-September) levels of "Cs in perch, northern pike, and walleye. These were ail adult fish caught commercially. The effective half-time for 187C’s in these fish is appreciably longer than that exhibited by the fallout rate, and for the average of the three species amounts to about a six-year half-time. The persistence of 18*Cs under aquatic conditions may be due to recycling or to the continuing biological availability of this radionuclide in a water environment. In any event, this behavior suggests further study of the fate of radiocesium released in water. In summary, a comparison between the total inter- nal dose from #27Cs experienced by a typical Chicago adult and a member of the Red Lakes band of Chippewa Indians eating Red Lakes fish might be of inter- est. In 1965, on the basis of examining the “7Cs/K ratio In urine specimens, it was determined that the fish-consuming Red Lakes people had three times the body burden of °7Cs that prevailed in Chicago. Using the observed decrease in “7Cg content of fish shown in Figure 173 and summing the internal doses given in Figure 172 for the interval 1965-1968, it ap- pears that while a Chicago resident received ~3.6 mRads, the Red Lakes individual accumulated ~19 mRads. REFERENCES 1. Miller, C. EZ. and Marinelli, L. D. Science 124, 122 (1956). 2. Roessler, G.3., Dunavant, B. G., and Roessler, C. E. Health Phys. 16, 673 (1969). 3. Gustafson, P. F, Radioecological Concentration Processes. Proc, Int. Symp. held in Stockholm, 25-29 April 1966. Pergamon Press, Oxford, 1966, p. 853. ARTICLES PUBLISHED BY THE RADIOLOGICAL PHYSICS DIVISION STAFF JULY 1968-JUNE 1969 PUBLICATIONS Berlman, I. B., C. R. Goldschmidt, Y. Tomkiewicz, and A. Weinreb. Energy Transfer from Pyrene to Perylene at High Excitation Intensity. Chem. Phys. Letters 2(8), 657-658 (December 1968). Goldschmidt, C. R., Y. Tomkiewiez, and I. B. Berlman, An Intermolecular Interaction of Excited States in Crystals and Liquids. Chem. Phys. Letters 2(8), 520-522 (December 1968). Goldschmidt, C. R., Y. Tomkiewiez, and I. B. Berlman. A Saturation of Exeimer Formation. Chem. Phys. Letters 2(8), 536-538 (December 1968). Berlman, I. B. Evidence of Intramolecular Hydrogen Bonding from Spectropraphic Data. Chem. Phys. Letters 3, 61 (1969). Brar, 8. 5S. and D. M. Nelsen. Cs!7 In Various Chicago Foods. Health and Safety Laboratory Quarterly, U.S. Atomic Energy Commission Report, HASL197, pp. I1I-64-I11-67 (July 1968); HASL-200, pp. III-18-III-21 (October 1968); HASL-204, pp. TL-2-N1-5 January 1969); HASL-207, pp. ITI-2- IiI-5 (April 1969), Brar, 8. S., D. M. Nelsen, et al. Thermal Neutron Activation Analysis of Airborne Particulate Matter in Chicago Metropolitan Area, Modern Trends in Activation Analysis. U. 5. Dept. Commerce, Natl. Bur. Std. Spee. Publ. 312, June 1969, Vol. 1, pp. 43-54. Croke, E. J., J. E. Carson, D. F. Gatz, H. Moses, A. 8. Kennedy, J. A. Gregory, J. J. Roberts, K. Croke, J. L. Anderson, D. Parsons, James Ash, J. E. Norco, and R. P. Carter. Chicago Air Pollution Svstem Model. Third Quarterly Progress Report. Argonne National Laboratory Report ANL/ESCC-003 (October 1968). Croke, E. J., J. E. Carson, D. F. Gatz, H. Moses, A. 8. Kennedy, J. E. Norco, J. J. Roberts, Ik. Croke, J. B. Anderson, D. M. Nelson, J. E. Ash, R. P. Carter, D. Parsons, J.-W. Lin, and R. J. Votruba. Chicago Air Pollution System Analysis Program. Fourth Quarterly Report. Argonne National Laboratory Report ANL ES-CC-004 (March 1969). Carson, J. Carson, J. E., R. J. Votruba, and J.-W. Lin. Chieago’s Air Pollution Incident Control Test. Summer 1968. Informal Report (April 1969). Gustafson, P. F. Cesium-37 in Freshwater Fish during 1945-1965. Sympostum on Radtoecology, Proc. 2nd Natl. Symp., Ann Arbor, Michigan, May 15-17, 1968. U. S. Atomic Energy Commission Report CONF-670503 (1969), pp. 249-257. Gustafson, P. F. Gross Gamma-Ray Activity Profiles over Northern Chile. Health and Safety Laboratory Quarterly, U. 3. Atomic Energy Commission Report HASL-204 (August-October, 1968), pp. 163- 174. Gustafson, P. F., 8. 8. Brar, and D. M. Nelson. Possibie Evidence of Radioactivity from Southern