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  • Author or Editor: Susanta Lahiri x
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Abstract  

No-carrier-added (nca) 90Nb (14.6 h) was produced by irradiating a natural zirconium foil of 4.9 mg/cm2 thickness by 13 MeV proton beam. Nca 90Nb of ~27 kBq activity was produced in the target matrix. Liquid–liquid extraction technique was applied using trioctylamine (TOA) in cyclohexane to separate nca 90Nb from bulk zirconium matrix. About 70% radiochemical yield of nca 90Nb was achieved with a separation factor of 1.4 × 104.

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Abstract  

Amongst various radionuclides of molybdenum, 90Mo and 99Mo have suitable β energy for clinical uses. In this paper we report separation of 99Mo from 99Mo-99mTc equilibrium mixture. The liquid–liquid extraction technique has been employed using trioctylamine (TOA) diluted in cyclohexane as organic phase and HCl as aqueous phase. At 10−5 M HCl and 0.5 M TOA concentration 99mTc quantitatively transferred to the organic phase leaving 99Mo in the aqueous phase. The developed separation method is efficient and provides very high separation factor.

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Abstract  

No-carrier-added (nca) 208,209,210At was produced for the first time from 9Be induced reaction on thallium carbonate target at BARC-TIFR pelletron, Mumbai, India. The target of 4 mg/cm2 thickness was prepared by centrifugation technique. Nca At was separated from the thallium target by liquid–liquid extraction using liquid cation exchanger HDEHP dissolved in cyclohexane and liquor ammonia.

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Abstract  

An aqueous biphasic extraction system was designed using different molecular weights of polyethylene glycol and concentrated salt solutions of sodium sulphate to separate the heavy metals, Hg, Tl and Pb from Li irradiated Au matrix. All the four elements could be separated from one another by this extraction process by simply optimizing the salt rich phase, the pH of the salt rich phase and the molecular weight of the polymer rich phase.

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Abstract  

Extraction behavior of zirconium and hafnium tracers,95Zr and175,181Hf, in HF, HCl, HNO3 and H2SO4 media with the liquid anion exchanger TOA has been studied. Under optimum conditions, TOA was found to be very effective for quantitative extraction of the individual elements at their trace scale concentrations, but due to higher extractibility and almost identical chemical behavior of the radiotracers towards TOA, the reagent was not so effective for mutual separation of the elements when they were present as congeneric pairs in the aqueous solutions. Extents of extraction of the elements at different stages were measured by -ray spectrometry.

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Abstract  

In this article we studied the dynamic dissociation constant (k d) of 99Mo complexed with insulin molecule at various pH. The k d values were determined by dialysis technique against deionised water. The T 1/2 of the molybdenum–insulin complexes were found to be 6.41, 5.25 and 3.5 h at pH 5, 6 and 7 respectively. The half-lives indicate that insulin may act as good carrier of 99Mo to the intestine and may be useful in the field of nuclear medicine.

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Abstract  

The uptake behavior of long-lived radionuclides such as 134Cs (2.06 years), 137Cs (30 years) or 133Ba (10.54 years) on calcium alginate (CA) beads have been investigated. The CA beads are able to remove 133Ba (92%) at pH 7 after 90 min of exposure from the binary mixture of two. The separation method of short-lived daughter 137Ba (2.55 min) from its long-lived parent 137Cs (30 years) using this CA beads have also been developed.

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