No-carrier-added (nca) 199–201Tl has been separated from nca 199–201Pb using an environmentally friendly biocompatible polymer, poly(N-vinylpyrrolidone). The method uses no harmful chemicals
and is based on the process of dialysis of PVP-Pb and PVP-Tl complexes against triple-distilled water. It has been observed
after one hour of dialysis that 75–85% Tl (in both +3 and +1 oxidation states) comes out of dialysis sack without any contamination
Studies on liquid-liquid extraction of trace level cerium and gadolinium,141Ce and153Gd, from HCl and HNO3 media with liquid cation exchanger, HDEHP reveal that a quantitative separation of the elements from an admixture of the
two radioisotopes can be achieved with 0.1% HDEHP and 0.01N HCl. The condition is also valid for separation of trace amount
of153Gd from bulk or macro quantity of cerium.
A comprehensive review has been made to discuss the role of various radionuclides of lanthanide series elements in the field
of nuclear medicine. The role of several pharmaceuticals labeled with radiolanthanides and used for investigative purposes
like measurement of cerebral blood flow, bone density measurement, bone marrow imaging, etc., have been described. The role
of lanthanide radionuclides in radiation synovectomy, radioimmunotherapy, etc., have also been discussed. Methods of preparation
of some representative radiopharmaceuticals like153Sm-EDTMP,153Sm-HYP, have been presented. An outline on the production of carrier free radioisotopes of lanthanide series elements has
Studies on adsorption behavior of heavy radionuclides, present altogether in no-carrier-added state, e.g., 197-200Pb, 197-200Tl and 197Hg, have been carried out with calcium alginate beads. High lead (100%) and moderate thallium removal (~65%) was achieved
in pH range 2-7. 100% mercury removal was also achieved at pH 2 and 4. Effort has been made to recover all three radionuclides
adsorbed in the calcium alginate beads using various chemicals, such as HCl, thiourea, sodium acetate, sodium oxalate and
sodium nitrite. It was found that 0.1M HCl and 0.1M thiourea could remove at pH 1 80-90% of adsorbed Pb. Tl recovery was possible
by all chemicals mentioned above. Hg was also recovered by all chemicals except HCl.
Carrier-free radionuclides of tungsten and tantalum, 176,177W and 176,177Ta have been produced by heavy ion activation of holmium target with 97 MeV 16O5+ beam. Radiochemical separation scheme has been developed to isolate tungsten and tantalum radionuclides from the holmium target matrix.
The concept of tracer packet, which can be defined as a group of carrier-free radioactive isotopes of few elements, which have been produced together with an objective to study some particular physical, chemical or biological systems has been introduced in this paper. The tracer packet can be produced with low projectile energy (5-7 MeV/u) contrary to the multitracer technique. A thick cobalt foil has been irradiated consecutively with 16O, 7Li and 12C beams to produce the tracer packet containing carrier free radiotracers of Mn, Cu, Zn, Ga, Ge, As and Se which after removal of bulk cobalt can be used for further studies of essential micro nutrient elements.
Tracer packet, a group of carrier-free radioactive isotopes of few elements which are produced together with an objective to study some particular physical, chemical or biological systems is a new conception over the century old tracer technique and a decade old multitracer technique. This paper describes the production of a tracer packet of heavy and toxic metals containing carrier-free radionuclides of some heavy and toxic elements like mercury, thallium, lead, bismuth and polonium produced by medium energy 7Li and 12C irradiation on gold target and subsequent separation of bulk gold from the carrier-free products.
Adsorption of long-lived 125Sb radioisotope (T1/2 = 2.75 y) on alumina (Al2O3) and titania (TiO2) has been studied at different pH. Both the oxides have good adsorption capability for the 125Sb radioisotopes but the TiO2 is much superior. Adsorption kinetics of 125Sb radioisotopes on TiO2 surface and desorption of 125Sb radioisotopes from TiO2 surface in acidic and alkaline media have also been studied. The 125Sb-TiO2 phase has been subjected to γ-irradiation and found to be radiation stable against antimony release.
Irradiation of natural lutetium oxide target with 7Li beam results in the formation of no-carrier-added 177W radionuclide in the matrix. An efficient radiochemical procedure for the separation of no-carrier-added (nca) 177W (T1/2 = 2.21 h) radionuclide is presented using liquid-liquid extraction (LLX). A high separation factor between nca 177W from the target Lu has been achieved with 0.1 M TOA and 8 M HCl. About 85% of 177W has been extracted in the organic phase keeping Lu in the aqueous phase in a single run. Using this production and separation
method radiochemically pure 177W can be obtained. The separation has also been tried with a greener approach viz. aqueous biphasic extraction. In this case,
aqueous biphasic extraction is not a good method for separation of 177W. The radionuclide 177W thus obtained can be used to study the extraction pattern of lighter homologue of the element 106 (Sg) together with Mo,
which in turn is important to investigate the chemistry of Sg.