This report describes a conceptual design for a pilot-scale capability to produce plutonium oxide for use as exercise and reference materials, and for use in identifying and validating nuclear forensics signatures associated with plutonium production. This capability is referred to as the Pilot-scale Plutonium oxide Processing Unit (P3U), and it will be located in the Radiochemical Processing Laboratory at the Pacific Northwest National Laboratory. The key unit operations are described, including plutonium dioxide (PuO2) dissolution, purification of the Pu by ion exchange, precipitation, and conversion to oxide by calcination.

This report examines the need for actual Hanford tank waste solutions to support tasks in the Technetium Management Program in fiscal year (FY) 2016. One key need is to identify both samples where a majority of the soluble technetium is present as pertechnetate and samples where it is not. The total amount of tank supernatant needed from any given tank waste supernatant was determined by polling the tasks leaders for their technology testing needs in FY16 and then arbitrarily ascribing a 10% process loss associated with consolidation and the Cs-137 removal needed to reduce the dose to a level suitable for testing in radiological fumehoods. These polling results identified a need for approximately 2.1 to 3.6 kg of any particular targeted Hanford tank waste supernatant.

The objective of this report is to propose a method to evaluate the presence and extent of soluble, non-pertechnetate Tc in Hanford tank supernatants as well as methods that might be used to gain insight as to the nature of the specie(s) that make up this fraction. This study will then provide a recommendation as to the preferred approach for identifying and quantifying the presence of Hanford tank supernatant-soluble, non-pertechnetate, technetium. The recommendation will also describe an approach to address the issue of whether inductively coupled plasma mass spectrometry (ICP-MS) analysis, which is useful as a monitoring tool for Tc, may be confounded by the presence of other mass 99 species.

The previously unknown Polyoxometalate A-beta-Si2W18Ti6O7714- has been prepared by the reaction of A-beta-HSiW9O349-with Ti(O)(C2O4)22- or Ti(O)SO4 under controlled pH conditions; yield optimization experiments are also reported. Isolation of this new Ti(IV)-substituted polyoxometalate was accomplished both as its water-soluble K+ salt and as its organic-solvent-soluble Bu4N+ salt. The unambiguous characterization of A-beta-Si2W18Ti6O7714-was accomplished by means of elemental analysis, IR and W-183 NMR spectroscopy, and a single-crystal X-ray structural analysis of the Bu4N+/H+ salt, (Bu4N)7H7Si2W18Ti6O77 (Pbcm; a = 19.958(11), b = 36.880(8), c = 28.936(5) angstrom; Z = 4; R = 0.072 for 4614 observed independent reflections). The X-ray diffraction structural analysis reveals that the correct structural formulation is A-beta-(SiW9O37)2(Ti-O-Ti)314-, a condensed aggregate of two hypothetical ''A-beta-SiW9(TiOH)3O377-'' Keggin units that have lost three H2O by forming three Ti-O-Ti bridges. The present synthesis and characterization, plus recent results from the literature, reveal that a new subclass of polyoxoanions of general formula X2M18M'6O77n- can be prepared for M' in at least three different oxidation states, M'(III), M'(IV), and M'(V).

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyoxoanions derived from tungstosilicate (A-.beta.-SiW9O3410-): synthesis, single-crystal structural determination, and solution structural characterization by tungsten-183 NMR and IR of titanotungstosilicate (A-.beta.-Si2W18Ti6O7714-)Yin Lin, Timothy J. R. Weakley, Brian Rapko, and Richard G. FinkeCite this: Inorg. Chem. 1993, 32, 23, 5095–5101Publication Date (Print):November 1, 1993Publication History Published online1 May 2002Published inissue 1 November 1993https://pubs.acs.org/doi/10.1021/ic00075a025https://doi.org/10.1021/ic00075a025research-articleACS PublicationsRequest reuse permissionsArticle Views430Altmetric-Citations73LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-AlertscloseSupporting Info (1)»Supporting Information Supporting Information Get e-Alerts

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBis(.eta.6-hexamethylbenzene)(.eta.6,.eta.6-polycyclic aromatic)diruthenium(II,II) complexes and their two-electron reduction to cyclohexadienyl anion complexesKlaus Dieter Plitzko, Gabriele Wehrle, Bernhard Gollas, Brian Rapko, Joerg Dannheim, and Virgil BoekelheideCite this: J. Am. Chem. Soc. 1990, 112, 18, 6556–6564Publication Date (Print):August 1, 1990Publication History Published online1 May 2002Published inissue 1 August 1990https://doi.org/10.1021/ja00174a016RIGHTS & PERMISSIONSArticle Views311Altmetric-Citations25LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (1 MB) Get e-AlertsSupporting Info (1)»Supporting Information Supporting Information Get e-Alerts

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTrisubstituted heteropolytungstates as soluble metal oxide analogs. III. Synthesis, characterization, phosphorus-31, silicon-29, vanadium-51, and 1- and 2-D tungsten-183 NMR, deprotonation, and proton mobility studies of organic solvent solute forms of HxSiW9V3O40x-7 and HxP2W15V3O62x-9Richard G. Finke, Brian. Rapko, Robert J. Saxton, and Peter J. DomailleCite this: J. Am. Chem. Soc. 1986, 108, 11, 2947–2960Publication Date (Print):May 1, 1986Publication History Published online1 May 2002Published inissue 1 May 1986https://doi.org/10.1021/ja00271a025RIGHTS & PERMISSIONSArticle Views1916Altmetric-Citations208LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (2 MB) Get e-AlertsSupporting Info (1)»Supporting Information Supporting Information Get e-Alerts