Foreword (M.S. Baxter).Preface (A. Kudo). Introduction: Origins and Occurrence of Plutonium.Environmental plutonium - creation of the universe to twenty-first century mankind (D.M. Taylor). Plutonium in the marine environment at Thule, NW-Greenland after a nuclear weapons accident (H. Dahlgaard, M. Eriksson, E. Ilus, T. Ryan, C.A. McMahon, S.P. Nielsen). Isotopic ratio of Pu released from fuel cycle facilities - importance of radio-chemically pure 236Pu as a tracer (H. Yamana, T. Yamamoto, H. Moriyama). Analytical Methodologies.Plutonium measurement using accelerator mass spectrometry: methodology and applications (D. Oughton, P. Day, K. Fifield). ICP-MS analysis of environmental plutonium (Y. Muramatsu, S. Yoshida, K. Tagami, S. Uchida, W. Rühm). Methods for applying plutonium fission track analysis (L.C. Sun, Y.-H. Xue). Speciation and Distribution of Plutonium in the Environment.Distribution and movement of environmental plutonium (G.R. Choppin, A. Morgenstern). The preliminary development of a plutonium in blood plasma equilibrium model (J.R. Duffield). Actinides associated with particles (B. Salbu). Speciation and transformation of sorbed Pu on geologic materials: wet chemical and spectroscopic observations (M.C. Duff). A plutonium geochemical database for performance analysis of high-level radioactive waste repositories (M. Yui, T. Shibutani, M. Shibata, D. Rai, M. Ochs). Studies of the speciation, colloidal association and remobilisation of plutonium in the marine environment (P.I. Mitchell, A.B. Downes, L.L. Vintró, C.A. McMahon). Microbial transformations of plutonium and implications for its mobility (A.J. Francis). Interaction of Pu, Np and Pa with anacrobic microorganisms at geologic repositories (T. Sasaki, J. Zheng, H. Asano, A. Kudo). Case Studies.Global transport of plutonium from Nagasaki to the Arctic: review of the Nagasaki Pu investigation and the future (A. Kudo, Y. Mahara, J. Zheng, T. Sasaki, E. Yunoki, M. Sugahara, D.C. Santry, J.-P. Garrec). Long-term trends of plutonium fallout observed in Japan (K. Hirose, Y. Igarashi, M. Aoyama, T. Miyao). The behaviour of plutonium in the Pacific Ocean (H.D. Livingston, P.P. Povinec, T. Ito, O. Togawa). Plutonium in temperate and Arctic lakes (M. Eriksson, E. Holm, P. Roos, H. Dahlgaard). Plutonium: the legacy of Sellafield (P.J. Kershaw, K.S. Leonard, D. McCubbin, J.N. Aldridge). Characteristics of cumulative deposition of fallout Pu in environmental samples collected in South Korea (M.H. Lee, C.W. Lee). Plutonium mobility and its fate in soil and sediment environments (Y. Mahara, A. Kudo). The present radiological situation at the nuclear weapons test site at Semipalatinsk in Kazakhstan with regard to plutonium contamination (G.M. Voigt, N. Semiochkina, B. Dodd, B.J. Howard, B. Karabalin, M. Mukuschewa, G. Rosner, A. Sanchez, D.L. Singleton, P. Strand). Some aspects of plutonium in and around the former Soviet Union's Semipalatinsk nuclear test site (M. Yamamoto, M. Hoshi, J. Takada, T. Tsukatani, S. Oikawa, I. Yoshikawa, T. Takatsuji, A. Kh. Sekerbaev, B.I. Gusev). Plutonium in the environment of Poland (a review) (J.W. Mietelski). A review of plutonium releases from the Savannah River Site, subsequent behavior within terrestrial and aquatic environments and resulting dose to humans (T.G. Hinton, J.E. Pinder,III). Closing overview and discussion, chaired and summarised (D.M. Taylor).Index of Authors.Subject Index.