Biennial Report 2005-2007 - Saha Institute of Nuclear Physics

226 Biennial Report 2005-07is formed outside a-ZrP. The ac conductivity and dielectric properties are extensively studied atlow temperature up to a frequency of 5 MHz. The charge transport process is due to electron andpolaron tunneling. The dielectric response exhibits broad spectra, which are analyzed by Cole-Coledistribution function. The shape of dielectric spectra and temperature dependence of relaxationtime indicates the relaxor ferroelectric behavior of the composite. The microstructure and electricaltransport properties are significantly different from the composite obtained by direct mixing andpolymerizing of a-ZrP and aniline monomer.SK De, S De, A DeCSD6.1.9 Radioanlytical & Nuclear Chemistry6.1.9.1 Separation of trace level Sm and Nd: A prerequisite for measurement of146 Sm by Accelerator Mass Spectrometry146 Sm(T 1/2 =108y) is believed to be of supernova origin and might be available in Earth crust inultratrace amount as a signature of supernova burst. Detection of such scanty amount of 146 Sm isonly possible by Accelerator Mass Spectrometry, if the sample is free from its naturally abundantisobar 146 Nd. We have developed a method of separation of samarium from neodymium usinga simulated condition where neutron irradiated 153 Sm and 147 Nd were used as precursor of thecorresponding elements. The quantitative separation is possible by liquid liquid extraction (LLX)with 1% di-(2-ethylhexyl) phosphoric acid (HDEHP) from 0.025M HCl.Samir Maji†, Gunther Korschinek†, Birgit Wierczinski†, Susanta LahiriCSD6.1.9.2 Separation of no-carrier-added 52 Mn from bulk chromium: A simulation studyfor AMS measurement of 53 MnMn-53 (T 1/2 =3 My) is a cosmogenic radionuclide. Measurement of concentrations of 53 Mn in rocksis advantageous to study earth surface processes because that occurred in a time period during fewmillion years. The main interference in the detection of 53 Mn by AMS is its stable isobar 53 Cr,which is million times abundant in nature. Method of separation of chromium and manganesehas been developed using radiometric simulation. The quantitative separation is possible by LLXtechnique using tri-octylamine (TOA) as the organic reagent and 8M HCl as aqueous phase.Susanta Lahiri, Dalia Nayak, Gunther Korschinek†CSD6.1.9.3 An alternative production and separation of astatine radionuclidesAstatine is the least studied halogen amongst its homologues. Astatine-211 is well known forhaving a promising potential to be used in internal radiation therapy for cancer. In this work theproduction of 209,210 At radionuclides was done for the first time using medium energy 7 Li beam andsubsequent separation of At radionuclides from lead nitrate target using three different methods.The conventional liquid-liquid extraction technique, the aqueous biphasic extraction technique and