... on 14 C production in the atmosphere since A.D. 1950 ( Hua and Barbetti, 2004 ). Therefore, activities of natural lead ( 210 Pb) and artificial cesium and americium ( 137 Cs, 241 Am) radionuclides, contents of mercury (Hg) and organic pollutants (such as polychlorinated biphenyls, PCBs), as well...

... ) n 2 + 60 was 7.6 × 10 –15 m 2 s –1 . Table 2. Final distribution of Cs, Np, Am and Co in the series-2 experiments. Fig. 7. Distribution of americium-241 in the bentonite mixture at the end of the series-2 experiments and the results of the least-squares fitting...

...' chemical behaviour of these elements, particularly plutonium. As metals, there is a slight `actinide contraction' with the addition of each 5f electron because these electrons enter the conduction band, and the increased attractive nuclear force decreases the atomic size. However, at americium (95) each 5f...

..., Neptunium, Plutonium, Americium and Technetium . NEA OECD , Elsevier , 919 pp Hedin A ( 1997 ) Spent Nuclear Fuel - How Dangerous Is It? SKB Technical Report 97-13, Swedish Nuclear Fuel and Waste Management Co. , 60 pp Janeczek J ( 1999 ) Mineralogy and geochemistry...

... . 472 – 477 . National Radiological Protection Board Revised generalised derived limits for radioisotopes of strontium, ruthenium, iodine, caesium, plutonium, americium and curium . 9 ( 1 ) 1998 . Organisation for Economic Cooperation and Development The Radiological and Health Impact...

... between the lanthanides and members of the actinide series is also an important attribute. Neodymium, for example, is frequently used as a ‘chemical analogue’ for americium owing to the similar charge-size characteristics of the Nd 3+ and Am 3+ ions. These findings indicate that the transuranic elements...