..., plutonium and re-enrichment of depleted uranium are other sources of supply to meet the global requirements. Sources of secondary uranium supply with their unexpected level of availability have adversely affected the growth of uranium mining industry during last decade. However, the planned capacity...

... Clay Minerals Society Clay Extraction Chromatography ICP-MS Neptunium Non-isotopic Tracer Plutonium The studies mentioned above proved that Pu can be used as a non-isotopic yield tracer for determination of Np. 242 Pu has been used by Dai et al. ( 2015 ) and Qiao et al. ( 2013b...

... contaminated by long-lived nuclides, such as plutonium, which is generally termed “long-lived intermediate-level waste” in Europe or “transuranic waste” in the US; 3) low-level waste, mainly contaminated by short-lived radionuclides generated by medical procedures and reactor operations and suitable...

... of a PUREX process 1 1 Plutonium Uranium Redox EXtraction, a process for the reprocessing of spent nuclear fuel to separate uranium and plutonium from the fission products and from one another. and purified by using a cation exchange procedure ( Chitnis et al. , 1979 ). The radiotracers 238 Np...

.... Such observations led to monazite-type structures being proposed as a potential host matrix for sequestering long-lived radionuclides produced during the nuclear fuel cycle and/or plutonium and americium from dismantled nuclear weapons. Monazite has two main advantages as a matrix for the containment of radioactive...

...G. Deissmann; S. Neumeier; G. Modolo; D. Bosbach Abstract Separated stocks of UK civil plutonium are currently held as a zero value asset in storage, as there is no final decision about whether they should be treated as a resource for future use as nuclear fuel or as waste. Irrespective of future...

... Waste Management Directorate's research to develop package fissile material limits (in the form of screening levels) for four different categories of ILW, defined according to uranium or plutonium composition: (1) irradiated natural and slightly enriched uranium (uranium containing up to 1.9 wt.% 235 U...

... types); 237 Np is a moderately sorbing radionuclide with K d uncertainty distributions ranging from about 0.5 to 6 mL g −1 ; and isotopes of plutonium are considered strongly sorbing radionuclides with K d uncertainty distributions ranging from about 10 to 200 mL g −1 . The diffusion...

...R. L. Kimber; C. Boothman; P. Purdie; F. R. Livens; J. R. Lloyd Abstract Understanding the biogeochemical behaviour of actinides in the environment is essential for the long-term stewardship of radionuclide contaminated land. Plutonium is of particular concern due its high radiotoxicity, long half...

... and 137 Cs, from the “split” uranium atoms. In contrast, the more stable 238 U captures neutrons and, with subsequent decay, creates heavier, transuranium elements, such as 239 Pu, 239 Np, and minor amounts of Am and Cm isotopes. The concentration of plutonium in UO 2 fuel typically reaches a value...

...Bernd Grambow; Christophe Poinssot Abstract Used nuclear fuel is a redox-sensitive semiconductor consisting of uranium dioxide containing a few percent of fission products and up to about one percent transuranium elements, mainly plutonium. The rapid increase in temperature in the cores...

... in the use of actinide-bearing minerals, especially isometric pyrochlore, A 2 B 2 O 7 ( A = rare earths; B = Ti, Zr, Sn, Hf), for the immobilization of actinides, particularly plutonium, both as inert matrix fuels and nuclear waste forms. Systematic studies of rare-earth pyrochlores have led to the discovery...

.... Plutonium and Ce (red) are coordinated by eight O atoms (blue). Plutonium appears to be more rounded than Ce in this structure, and the bonded ionic radius of Pu is slightly larger than that of Ce in the elongate O-cation bonds. All calculations assume the thermodynamic stability of both end-members...

... in the environment, which can result from an accidental release or from subsurface disposal, is an important area of continuing study. Processes that may enhance Pu mobility in the environment and possible transport and exposure pathways need to be better understood and identified. Plutonium behavior...

... by subsurface scientists and engineers (leaving the bulk of the parallelization to the preprocessor), to allow both sequential and parallel execution of the simulator, and to provide access to a variety of scalable linear system solvers and preconditioners. Plutonium recovery activities at the Plutonium...

.... Plutonium distributions were anomalous in nature—transport from oxidized Pu sources was less than expected, and a small fraction of Pu from reduced sources moved more. Studies conducted with these lysimeter sediments indicated that surface-mediated, oxidation–reduction (redox) reactions may be responsible...