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Abstract  

Batch equilibration studies have been carried out to understand the uptake of Th(IV), U(VI) and Pu(IV) on a conventional gel type cation exchange resin, Dowex 50WX8, from TBP-Shell Sol-T mixtures containing different amounts of nitric acid. Based on the results of the equilibration studies, column experiments have been carried out and conditions optimized to achieve separation of these elements present in binary and ternary mixtures. The influence of water content of the resin phase and the nature of the exchanging cation on the extent of uptake has also been investigated.

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Abstract  

Application of extraction chromatographic technique to the analytical separation of Th/IV/ and U/VI/ has been investigated. The stationary phase was a macroporous resin Amberlite XE-270 impregnated with undiluted trin-n-butylphosphate /TBP/ and the mobile phase was either 5.OM HNO3 or 6M HCl. Separation of traces of Th/IV/ from large quantities of U/VI/ was achieved on a laboratory column by elution of the absorbed Th/IV/ with 6M HCl.

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Ion exchange in organic solvents

IV. Separation of plutonium from uranium in 30% TBP on amberlyst-15

Journal of Radioanalytical and Nuclear Chemistry
Authors:
P. Mayankutty
,
N. Pillai
,
S. Shinde
, and
M. Nadkarni

Abstract  

Studies on the partitioning of plutonium from 30% TBP by ion-exchange absorption on macroporous cation exchanger Amberlyst-15 have been described. Detailed loading experiments indicate that the resin absorbs plutonium in preference to uranium from loaded organic phase at low organic phase acidities (around 0.2M). Absorption behaviour of some fission products on the resin in 30% TBP is also reported. Possibility of using this procedure as an alternate method for plutonium partitioning from IAP stream of Purex process has been discussed.

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A Global Positioning System (GPS) permanent station has been established as a reference point at the Department of Civil Engineering of Indian Institute of Technology Bombay (IITB), by the IITB GPS group, and is continuously operating since January 2002. The station is being operated under a research project funded by the Department of Science and Technology (DST), Government of India, under the “National GPS Programme for Earthquake Studies”. A brief description of the station set up, the strategy used in determining its precise position, and some sample results are presented in this paper.

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Abstract  

A single reagent radioimmunoassay for thyroxine in blood samples absorbed on filter paper for the mass screening of neonatal hypothyroidism is described. Blood samples were collected by pricking the heel of newborn babies (3 days old) and pressing Whatman 3 filter paper against the wound. 6 mm diameter blood spots were punched out at the time of assay and incubated with 0.4 ml of a preincubated antigen-antibody complex for six hours at 37 °C. 1 ml of 22% polyethylene glycol is used for the precipitation of antigen-antibody complex. The assay has a sensitivity of 2.2 ng/ml. 500 samples collected from newborns were analyzed in the assay and gave a mean of 117.6±31.9 ng/ml.

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Abstract

Ventricular septal rupture (VSR) is a rather rare, but at the same time very dreadful complication of acute myocardial infarction in the percutaneous coronary intervention (PCI) era and only limited evidence exist on the optimal treatment of this critical medical condition. VSR is less common following successful early thrombolysis and PCI occurring in myocardium supplied by infarct-related artery (IRA). We report two well-documented cases of successful VSR treatment which will provide valuable information for clinical practice especially due to the long-tem follow-up. Both cases underwent delayed elective surgical closure of VSR. This report clearly describes the incidence, potential risks and timing of occurrence, clinical features, and outcomes of ventricular septal rupture complicating acute myocardial infarction (AMI) after PCI. Hence the topic of this report is of great importance. Although the prognosis of patients who develop VSR is generally grave without immediate surgical repair, both our patients remained hemodynamically stable at discharge and during follow-up of more than 4 years.

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