Search Results

You are looking at 1 - 4 of 4 items for :

  • Author or Editor: A. Parab x
  • Chemistry and Chemical Engineering x
  • All content x
Clear All Modify Search

Abstract  

Application of dicesium metaborate ion /Cs2BO 2 + / in Thermal Ionisation Mass Spectrometry /TIMS/ for the determination of boron present at sub ppm level in heavy water moderator as well as for the isotopic composition of boron in boron carbide is reported. Contamination of samples with natural boron while determining trace levels of boron in heavy water was checked by analysing SRM-952 isotopic reference material. The atom ratios of boron in B4C were determined by directly fusing the material on the tantalum filament with Cs2CO3 as well as with Na2CO3 and also by following the conventional fusion procedures and the results were compared.

Restricted access
Journal of Radioanalytical and Nuclear Chemistry
Authors: K. Ramakumar, A. Parab, P. Khodade, A. Almaula, S. Chitambar, and H. Jain

Abstract  

Investigations were carried out on the determination of isotopic composition of boron using Cs2BO 2 + ion and thermal ionisation mass spectrometry. The results show distinct advantage over the normally used Na2BO 2 + ion.

Restricted access

Abstract  

A gamma-spectrometric method using an intrinsic high resolution germanium detector has been developed for the determination of isotope ratios of plutonium from samples in solution form. The method is based on the assay of low energy gamma-rays of238Pu,239Pu,240Pu and241Pu and does not require the use of branching intensities or the knowledge of detection efficiencies for different gamma rays. Since low energy gamma-rays are used, the effect of241Am has also been studied. It is found that results are not affected up to 0.5 wt% of241Am in plutonium samples. An accuracy of 3% is achievable in the determination of240Pu/239Pu and241Pu/239Pu atom ratios as demonstrated by carrying out measurements on isotopic standards of plutonium.

Restricted access
Journal of Radioanalytical and Nuclear Chemistry
Authors: S. Aggarwal, A. Almaula, P. Khodade, A. Parab, R. Duggal, C. Singh, A. Rawat, G. Chourasiya, S. Chitambar, and H. Jain

Abstract  

K-factors (= certified isotope ratio/observed isotope ratio) are determined for the isotope abundance measurements of uranium and plutonium by thermal ionisation mass spectrometry. An mdf of 0.07% and 0.18% per mass unit differing by a factor of about 3, is obtained for uranium and plutonium, respectively, employing double rhenium filament assembly in the ion source and Faraday cup as the detector using the presently available isotopic reference materials of uranium and plutonium.

Restricted access