[en] 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 x 10⁴. (author)

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[en] ⁹⁰Nb (mean β⁺ energy 662.2 keV, positron branching 51%, E_βmax = 1.5 MeV, T_1/2 = 14.6 h) is a positron emitter which has application in diagnostic nuclear medicine. Now-a-days, radioanalytical separation experiments are guided by the mandates of green chemistry and more attention is given to the resources obtained from nature. In this work, we have combined the concept aqueous biphasic separation and nature resourced chemistry to develop a separation route for ⁹⁰Nb from natural yttrium target. The nature-resourced chemicals are powerful green reagents in chemical processes. In this paper, catechins showed rewarding synergistic effect to separate ⁹⁰Nb in the PEG rich phase

No abstract available

[en] The ⁸⁹Y(α,3nγ)⁹⁰Nb reaction was studied at 35.7 MeV. The location of the 9⁺ member of the π(g/sub 9/2/ν(g/sub 9/2/)^-1 multiplet was clarified, and two previously unobserved higher-spin states were found. A partial level scheme with spin--parity assignments is exhibited. 1 figure

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[en] ^natY was irradiated with 34 MeV α-particles to produce ⁹⁰Nb. Separation of ⁹⁰Nb from bulk yttrium target was carried out using two naturally occurring alkaloids namely caffeine extracted from black tea leaves and piperine extracted from black pepper, both of which are commonly used in everyday household. In both the cases, SLX was opted as caffeine was insoluble in 2 M Na₂SO and piperine in HCl of varying concentration. ⁹⁰Nb was preferentially extracted by caffeine and piperine precipitate and bulk yttrium remained in supernatant. DFT calculations suggest the preferential binding of ⁹⁰Nb to different binding sites on caffeine and piperine. (author)

[en] Polyethylene glycol (PEG) based Aqueous Biphasic Systems (ABS) is a greener analytical technique compared to traditional solvent extraction system as both the phases are aqueous and it has been employed successfully in separation of various metal-ions. PEG based ABS separation is also well explored in our laboratory for the separation of no-carrier-added (nca) radionuclides from the corresponding bulk target materials. These include separation of nca ^209,210At from Pb(NO₃)₂, nca ^93mMo from Y target, nca ^199,200Tl, ^199,200Pb, ¹⁹⁷Hg from Au target, etc., and separation of trace amount of long lived ^152,154Eu from ¹³⁴Cs radionuclides. Several reports are available on the separation of ⁹⁷Ru from the corresponding targets using various analytical techniques such as solvent extraction, dry distillation, co-precipitation, wet distillation, liquid-liquid extraction and solid-liquid extraction methods. Production of ⁹⁷Ru from niobium target by ^natNb(⁷Li,3n)⁹⁷Ru reaction and subsequent separation of ⁹⁷Ru using ion-exchange technique was reported by Maiti et al. In the present work, we have tried to separate nca ⁹⁷Ru from bulk niobium target using PEG based ABS

[en] The isomeric 124.8 keV (4^-) level of ⁹⁰Nb is known to decay by an almost entirely converted M2 transition of 2.38 + - 0.36 keV energy, to the 122.4 keV (6⁺) level. The 6⁺ level decays further by a prompt direct transition to the 8⁺ (Tsub(1/2) = 14.6 h) ground level of ⁹⁰Nb. The half life of the isomeric state is about 19 s. Several authors have searched for possible 'chemical effects' on the decay rate of this isomeric state. A comparison of all available results seems to indicate that the decay constant of sup(90m)Nb in 4 different chemical environments (Zr and Hf lattices, ZrO and fluorine complex) are equal, but that for sup(90m)Nb in a Nb lattice and in Nb₂O₅, it is about 4% and 2% larger, respectively. However, these various results were obtained using very different experimental techniques, so the comparison is rather uncertain. The aim of the present experiment was to check this by measuring the decay rate of sup(90m)Nb nuclei implanted in various metallic foils, including Zr, Hf and Nb. (Auth.)

[en] The N=Z odd-odd nuclei in the A= 70-90 region was the subject of much investigation in recent times. The ₄₁⁹⁰Nb and ₄₉⁹⁸In with ⁹⁰Nb which are relatively stable nuclei and ⁹⁸In near the proton drip line are discussed