Recent experimentation with stripper gases used for Accelerator Mass Spectrometry (AMS) has seen a divergence in the practices adopted at laboratories performing AMS of high mass species (such as actinides) at low and medium terminal voltages. At low voltages (<1 MV), the Ion Beam Group at ETH Zurich has demonstrated the advantages of using helium as the stripper gas, for both radiocarbon AMS [...

The European Commission is partly supporting research work on partitioning and transmutation of radioactive waste under the Fourth Framework Programme (1994-1998). This work includes nine research projects. Five strategy studies are evaluating the capabilities of various burners and fuel cycles to limit the production and even destroy the stock of actinides (plutonium and minor actinides). Two ...

A B S T R A C T Membrane Assisted Liquid Extraction of Actinides and Remediation of Nuclear Waste: A Review N.S. Rathore1, Ana Maria Sastre2, Anil Kumar Pabby1,* * Corresponding author at: Phone: + 91 2525265197, Fax: +91 2525244158 Article history: Received 2014-08-01 Revised 2014-12-05 Accepted 2014-12-10 Available online 2014-12-10 Membrane assisted liquid extraction (MALE) technologies are ...

One of the techniques of minor actinides transmutation is to recycle these nuclides into fission reactors. Two concepts of a minor actinides burner reactor with very hard neutron energy spectrum as well as very high neutronjlux me discussed. The fuel cycle facilities for these burner reactors am assessed to discuss the technical feasibili~ of these reactors. Transmutation of minor actinide in b...

Recent results from an experiment at GANIL, performed to investigate the main properties of fission-fragment yields and energy distributions in different fissioning nuclei as a function of the excitation energy, in a neutron-rich region of actinides, are presented. Transfer reactions in inverse kinematics between a 238U beam and a 12C target produced different actinides, within a range of excit...

A programme is in place to recover the minor actinides from the high active waste solutions of the reprocessing operations and burn them in the fast reactors as well as Accelerator Driven Subcritical Reactor Systems(ADS). Recovery flowsheets based on indigenously synthesised Octyl Phenyl N,N’diisobutyl carbamoyl methyl phosphine oxide (OΦCMPO), malonamides and diglycol amides are being develope...

At the near-neutral and reducing aquatic conditions expected in undisturbed ore deposits or in closed nuclear waste repositories, the actinides Th, U, Np, and Pu are primarily tetravalent. These tetravalent actinides (AnIV) are sparingly soluble in aquatic systems and, hence, are often assumed to be immobile. However, AnIV could become mobile if they occur as colloids. This review focuses on a ...

I f the periodic table is an atlas for chemistry, then the actinides should surely be labeled “Here be dragons”. All are radioactive, only thorium and uranium are found in appreciable quantities, and most of the rest are produced by the sort of modern-day alchemy that relies on nuclear reactors or particle accelerators. Stosh Kozimor, a staff scientist at Los Alamos National Laboratory, is one ...

From a chemist’s perspective, the environment is a complex, particularly elaborate system. Hundreds of chemically active compounds and minerals reside within the earth’s formations, and every patch of rock and soil is composed of its own particular mix. The waters that flow upon and through these formations harbor a variety of organic and inorganic ligands. Where the water meets the rock is a p...

Membrane assisted liquid extraction(MALE) technologies are gaining an important role as an extraction /separation technique for actinides and are being deployed as a  promising tool for remediation of nuclear waste generated in the reprocessing plant and other radioactive wastes containing a trace level of radionuclides. The present contribution outlines the classification of membrane assisted ...