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61.
62.
S. A. Ansari M. S. Murali P. N. Pathak V. K. Manchanda 《Journal of Radioanalytical and Nuclear Chemistry》2004,262(2):469-472
We describe an analytical procedure with the use of inductively coupled plasma optical emission spectrometry (ICP-OES) for the determination of about 20 elements in solutions of 177LuCl3 following the dissolution of the irradiated lutetium nitrate or oxide. The aliquots containing amounts of lutetium ranging from 1 to 100 µg in 1 ml volume were analyzed. It corresponded to the activity of 177Lu ranging from 5 to 100 mCi. The detection limits of the elements concerned were in the range of 1 to 100 ng·ml–1. The activity of 177Lu and other radionuclides was measured using a high-resolution gamma ray spectrometer. The developed procedures are to be used for routine quality control of 177Lu produced for synthesis of radiopharmaceuticals.This revised version was published online in November 2005 with corrections to the Cover Date. 相似文献
63.
P. N. Pathak R. Veeraraghavan V. K. Manchanda 《Journal of Radioanalytical and Nuclear Chemistry》1999,240(1):15-18
The distribution behavior of uranium and thorium has been investigated in a biphasic system of different aqueous nitric acid
concentrations and a solution of tris(2-ethylhexyl) phosphate (TEHP) inn-dodecane at 25°C. The effect of different uranium and thorium concentrations in the aqueous phase on the extraction of these
metal ions is evaluated. These results indicate that TEHP is a better choice than tri-n-butyl phosphate (TBP) for the separation of233U from the irradiated thorium matrix. 相似文献
64.
Ravi Joshi P. N. Pathak V. K. Manchanda S. K. Sarkar T. Mukherjee 《Research on Chemical Intermediates》2010,36(5):503-510
Recently, completely incinerable N,N-dihexyloctanamide (DHOA) has been identified as a promising alternative to tri-n-butyl phosphate for the reprocessing of spent nuclear fuels. The present work deals with the pulsed radiolytic investigation
on the reactions of DHOA with the radicals produced in the radiolysis of nitric acid and dodecane medium. The rate constants
of the reactions of DHOA with solvated electron, nitrate radical and dodecane radicals have been measured and the transients
have been characterized. In addition, the reactions of DHOA transients have also been studied. 相似文献
65.
Ce0.8Eu0.2O2?δ was synthesized by conventional solid state route as well as wet chemical route (i.e. cation complexation, combustion method). The crystallite size obtained for cation complexation and combustion samples is 14 and 19 nm while their surface area is 11.70 and 29.63 m2g?1 respectively. Cation complexation synthesized product lead to formation of agglomerates and hence the sintered sample showed porosity compared to combustion synthesized sample. However, despite high packing density the combustion synthesized sample showed lower grain boundary, total conductivity than cation complexation synthesized product due to the formation of siliceous film at the grain boundary. 相似文献
66.
67.
R. B. Gujar S. A. Ansari M. S. Murali P. K. Mohapatra V. K. Manchanda 《Journal of Radioanalytical and Nuclear Chemistry》2010,284(2):377-385
Extraction behaviour of actinides, lanthanides, fission products and structural elements has been studied with the two diglycolamide
extractants, namely N,N,N′,N′-tetra-2-ethylhexyl diglycolamide (T2EHDGA) and N,N,N′,N′-tetraoctyl diglycolamide (TODGA). The
acid extraction studies suggested that T2EHDGA (KH: 1.8) is less basic as compared to its linear homologue, TODGA (KH: 4.1). The distribution ratio of Am(III) by 0.1 M diglycolamides followed the order: TODGA > T2EHDGA. The number of ligand
molecules present in the stoichiometry of the extracted species of Am(III) was found to be three and four for T2EHDGA and
TODGA, respectively. Thermodynamics studies suggested that the extraction of Am(III) by both the extractants is exothermic
in nature. The radiolytic stability of TODGA and T2EHDGA solutions in n-dodecane has been investigated. Due to lower distribution ratio of Am by T2EHDGA, 0.2 M of its solution has been used as
compared to 0.1 M solution of TODGA. The distribution behaviour of various metal ions, viz. Am, Nd, Fe, Mo, Cr, Sr and Cs
has been studied from nitric acid as well as from simulated high level waste solution. 相似文献
68.
P. K. Mohapatra D. R. Raut A. K. Ghosh A. V. R. Reddy V. K. Manchanda 《Journal of Radioanalytical and Nuclear Chemistry》2013,298(2):807-811
In an attempt to evaluate radiation stability of several polymeric materials used as the support in supported liquid membrane studies for the transport of radionuclides from nuclear waste, flat sheets made from polytetrafluoroethylene, polysulfone, polyether sulfone, polyacrylonitrile and polyvinylidenefluoride were irradiated to varying extents using a 60Co gamma ray source and subsequently, the transport efficiency of the irradiated flat sheets were evaluated. The membrane integrity was assessed from the transport rates of Am3+ from a feed containing 3 M HNO3 into a receiver phase containing 0.01 M HNO3 as the strippant while 0.1 M TODGA (N,N,N′,N′-tetraoctyldiglycolamide) + 0.5 M DHOA (di-n-hexyloctanamide) in n-dodecane was used as the carrier extractant. The radiation stability of the membrane filters was evaluated after irradiating them up to 20 MRad absorbed dose in a gamma chamber. 相似文献
69.
Neetika Rawat B.S. Tomar V.K. Manchanda 《The Journal of chemical thermodynamics》2011,43(7):1023-1027
Complexation of U(VI) by succinate has been studied at various temperatures in the range of (298 to 338) K by potentiometry and isothermal titration calorimetry at constant ionic strength (1.0 M). The potentiometric titrations revealed the formation of 1:1 uranyl succinate complex in the pH range of 1.5 to 4.5. The stability constant of uranyl succinate complex was found to increase with temperature. Similar trend was observed in the case of enthalpy of complex formation. However, the increase in entropy with temperature over-compensated the increase in enthalpy, thereby favouring the complexation reaction at higher temperatures. The linear increase of enthalpy of complexation with temperature indicates constancy of the change in heat capacity during complexation. The temperature dependence of stability constant data was well explained with the help of Born equation for electrostatic interaction between the metal ion and the ligand. The data have been compared with those for uranyl complexes with malonate and oxalate to study the effect of ligand size and hydrophobicity on the temperature dependence of thermodynamic quantities. 相似文献
70.
S. Dutta P. K. Mohapatra V. K. Manchanda A. K. Das 《Journal of Radioanalytical and Nuclear Chemistry》2007,274(2):245-250
The work describes a procedure of preconcentration and separation of trace amounts of Pd(II) by solid phase extraction of
the metal ion by dithiooxamide groups incorporated into a matrix of polystyrene-divinylbenzene whereas the determination of
palladium has been carried out by radiotracer technique using 109Pd (T
1/2 = 13.43 hr, E
γ = 311, 647 keV). The experiments were carried out using both batch method and column operation. Parameters such as the amount
of resin, effect of pH, equilibration rate, sorption and desorption of metal ions have been studied. The maximum sorption
capacity for palladium was found to be 0.10 mmol·g−1 at pH 6.0. The method is rapid, has a good accuracy and can be used routinely. 相似文献