caa a22 4500 465730248 CHVBK 20180323111739.0 cr unu---uuuuu 170327e19900101xx s 000 0 eng 10.1007/BF02049346 doi (NATIONALLICENCE)springer-10.1007/BF02049346 Neptunium-237 in the marine environment determination in animal and plant species in the English Channel: Biological indicators and trophic relationships [Elektronische Daten] [P. Germian, G. Pinte] We have studied the uptake of237Np in marine plants and animals belonging to several phyla, and collected samples from the end of January 1986 to March 1986, in a sampling station situated near the outlet of the irradiated fuel reprocessing plant at La Hague. We determined the237Np by neutron activation analysis. This method is very sensitive, with a limit of detection of 5×10−10 mg, 1.3×10−2 mBq. The method consists of the following steps: Reduction of the neptunium to the tetravalent state by treatment with a mixture of hydrazine sulfate and ferrous iron-chromatographic separations on Dowex 1×10 resin in a nitric medium, then in a hydrochloric medium-neutron irradiation in a nuclear reactor-purification of the neptunium by chromatography on Dowex 1×10 resin in a nitric then hydrochloric medium-measurement of the isotope238Np by gamma ray spectrometry using a Ge(Li) detector. The species were collected at Goury, at the northwest extremity of the Cotentin Peninsula, 5 km from the outlet of the reprocessing plant at La Hague. The levels of237Np were as follows: red algaeCorallina officinalis 64 mBq kg−1 wet weight; andChondrus crispus 18 mBq kg−1 wet weight; the spongeHalichondria panicea 14 mBq kg−1 wet weight; the ascidianDendrodoa grossularia 12 mBq kg−1 wet weight. The bivaive molluscsPatella vulgata andGibbula umbilicalis (the flesh ofP. vulgata andG. umbilicalis: 4 and 7 mBq kg−1 wet weight respectively) also prove to be interesting biological indicators The transfer modes of237Np to the various species as a function of their trophic levels are discussed as well as the distribution among the organs in the species consumed and the radiological impact of human consumption. Akadémiai Kiadó, 1990 Germian P. Laboratoire de Radioecologie Marine, CEA, IPSN, DERS, SERE, B.P. 508 50105, Cherbourg Cedex, France aut Pinte G. Laboratoire d'analyse par activation Pierre Sue, CEA, IRDI, DERDCA, DCAEA, CEN/SACLAY9119, Gif Sur Yvette, France aut Journal of Radioanalytical and Nuclear Chemistry Kluwer Academic Publishers 138/1(1990-01-01), 49-61 0236-5731 138:1<49 1990 138 10967 https://doi.org/10.1007/BF02049346 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02049346 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Germian P. Laboratoire de Radioecologie Marine, CEA, IPSN, DERS, SERE, B.P. 508 50105, Cherbourg Cedex, France aut NATIONALLICENCE 700 1- Pinte G. Laboratoire d'analyse par activation Pierre Sue, CEA, IRDI, DERDCA, DCAEA, CEN/SACLAY9119, Gif Sur Yvette, France aut NATIONALLICENCE 773 0- Journal of Radioanalytical and Nuclear Chemistry Kluwer Academic Publishers 138/1(1990-01-01), 49-61 0236-5731 138:1<49 1990 138 10967 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer