dEE ee nbd be pianBi dows piece saci: shit ita is In fact, Spooner a vesiculosus, DI sessiie the yttrtum-90 in the y ee eerily ati of iety accumulated a Intern. Energy, found Bowen and Rubinson (1951)m the med- lanthanum-140 fro ates cant selected uptake might be gested that lanthanum ‘ * hey sug Later invest Omen property of yeast growth. huvever, showed that this apparent seen ations. surface adsorption phe Mvity was in reality a Since a ication). (lowen, personal commun mang the rare earth elementeoluxical requirement for v itively, the se ec not been demonstrated pos bably h pro is ve es abo mpl exa the ity described in al surfaces of tay to differences in the extern is et al. (1958) anisms. Chipman (1958) and Dav lation of the umu wa gested that the extent of acc anisms is at re earth nuclides by aquatic orge area of the leant partly related to the surfac ganisa. SUMMARY Many radioactive lanthanides are made avail r, hle in the production of nuclear energy; howeve onment Studies of their distribution in the envir conbeen have anisms living uptake by eir ; fued primarily to celi4_pridt, lanthanum-140, pro4 fBethium-147, and yttrium-90, 91. Ecological factors governing the distribution E ‘Sf the rare earths are physico-chemical and bio- The first are concerned with the proper- ‘Rogical. Bies of the nuclide and the nature of the environ~ and the second with the selectivity and re~ jpent, Precipitation 1957, Carritt, D.E., and J.H. Harley. of fission product elements on the ocean bottom by In physical, chemical and biological processes. The Effects of Atomic Radiation on Oceanography and Fisheries. Cohn, E Laboratory studies indicate that animals, inBluding man, are unable to absorb the rare earths Zo any extent from the gastrointestinal tract and hat elimination of them is rapid. The principal ites of deposition are the bone and the liver. ACKNOWLEDGMENTS This work was conducted under contract number @T(45-1)1385 between the U. S. Atomic Energy Com- WP ission and the University of Washington. REFERENCES eeetibiae J, Townsley, and R.W, Hiatt. 1986. mm Of radionuclides by marine organisms. The tr. The uptake, ac 4) oby marine fish, cumulation, and loss of yttriumand the i f lived radtonucl i mportance of short352-157.des in the sea. Biol. Bull. Labeda; w 4 th esperinenta, and T.R. Rice. 1957. Laboratory uf PadSunuclid the uptake, accumulation,and loss forte of Atomees CY Marine organisms. In The Efy Detiee Giation on Oceanography and keeoares ounett we Academy of Sciences, Buna? Pil, Washington. Publ. 551. tng4. A. . we A.C. Rubinson, 7T asgorT Otedlee y yeast. Greendale, A.E,, and N.E. Ballou. 1954. Physical state of fission product elements following their vaporization in distilled water and sea water. U.S. Naval Radiological Defense Lab., San Francisco, report USNRDL-436. 24 pp. Harley, J.H. fed.]. 1956. Operation Troll. Health and Safety Laboratory, New York, U.S. AEC report NYO-4656. SUmthara, eith fallout 195), 19588, Marine geochemical radioisotopes, Proc. pp. Translocation and inhalation of 77-80. Hanford Biology Research An- U.S. AEC report HW-69500. 1951, Fission product Hunter, H.F., and N.E. Ballou. Nucleonics 9(5): C-2-7, decay rates. Jacobson, L., and R. Overstreet. 1948. The uptake by plants of plutonium and some products of nuclear fission absorbed on soil colloids. Soil Sei. 65(2): 129-134. Krumholz, L.A,, and R.F. Foster. 1957. Accumulation and retention of radioactivity from fission products and other radiomaterials by fresh-water organisms. In The Effects of Atomic Radiation on Oceanography and Fisherjes. National Academy of Sciences-National Research Council, Washington. Publ. 551. pp. 88-35. Rare Kyker, G.C., and E.B. Anderson, [eds.I]. 1956. earths in biochemical and medical research: A Conference sponsored by the Medical Division, Oak Ridge Institute ef Nuclear Studies, October 1955. Oak Ridge Institute of Nuclear Studies, U.S, AEC report ORINS~12. 447 pp. Lowman, F.G. 1960. Marine biological investigations at the Eniwetok Test Site. In Disposal of Radio- active Wastes. Intern. Atomic Energy Agency, Vienna. pp. 105-138. Martin, De C., Jr. 1958. The uptake of radioactive wastes by benthic organisms. Proc. Ninth Pacific Sci. Congr. 16: 167-169. Moeller, T. 1956, The rare elements - an introduction to their chemistry. In Rare earths in biochemical and medical research: A Conference sponsored by the Medical Division, Oak Ridge Institute of NuOak Ridge Institute Glear Studies, Gctober 1955. of Nuclear Studies, U,S. AEC report ORINS-12. pp. » 2nd 1961. In Hanford Atomic Products Operation, nual Report for 1960. 1032. In R.A. General Electric Co., Uptake of lan- 167(4260): 37 pp. cel44o9. National pp. Nature S.H., W.B., Lane, J.K. Gong, L. Weisbecker, and W.L. Milne. 1957. Studies on the metabolism of inhaled aerosols of strontium and lanthanum. U.S. Naval Radiological Defense Lab., San Francisco, report USNRDL-Tr-175. 26 pp. Durbin, P.W., M.H. Williams, M. Gee, R.H. Newman, and J.G. Hamilton. 1956. Metabolism of the lanthanons in the rat. Proc. Soc. Exptl. Biol. Med. 91(1): 78-85. Bly available to and are poorly absorbed by terres@rial or aquatic organisms. They are accumulated @f accumulation can be related to surface area and @o species differences. S51. Davis, J.J., R.W. Perkins, R.F. Palmer, W.C. Hanson, and J.F. Cline. 1958. Radioactive materials in aqua~ tic and terrestrial organisms exposed to reactor effluent water. In Proc. 2nd Intern, Conf. Peaceful Uses Atomic Energy, United Nations, Geneva, 1 September-13 September, 1958, 18: 423-428. ,pxist in the particulate state, they are not read‘@rincipally by surface adsorption, and the degree Pubi. Chipman, W.A. 1958. Accumulation of radioactive matertals by fishery organisms. Proc. Gulf and Caribe bean Fish. Inst. lith Ann. Session. pp. 97-110, Hennacy, Because the rare earth nuclides -usually National Academy of Sciences- National Research Council, Washington. pp. 60-68, fBention of the nuclide by the organism. SS Conf. on the Peaceful Uses of Atomic United Nations, Geneva, 1 September-13 September, 1958 18: 429-440, ; ehereas another var Mee Dee 4! eect te of algae concentra different ly ked mar to 4 14 a + at ead serum (1949) found thatOne ; ag Radioecology 5136 Sees roo he ee Tes l-ll. and H.E, Kremers, 1945. The basicity characteristics of scandium, yttrium and the rare earth elements. Chem. Rev. 37(1): 97-159.

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