Studies on the evaporation and ionisation behaviour of uranium and plutonium in thermal ionisation mass spectrometry

Saxena, Manoj; Shah, P. M.; Kumar, S. Jagadish; Jairaman, Usha; Jain, H. C.

doi:10.1016/0168-1176(94)90022-1

Cited by 13 publications

(11 citation statements)

References 23 publications

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“…As a consequence, finding an answer to dealing with the isobaric interference of 238 Pu when measuring 238 U isotope is of vital importance. Several studies on the characterization of mixed uranium–plutonium oxides (MOX) and of unseparated safeguards samples containing plutonium and uranium emphasize the topicality of the measurement of 238 Pu in the presence of 238 U and vice versa by mass spectrometry. ,− These articles deal with materials that contain 3 to 300 times more uranium than plutonium, ,, materials that have a 1:1 ratio of plutonium and uranium, , and with materials that contain up to 5 to 10 times , more plutonium than uranium. U/Pu ratios between 1:10 and 100:1 for direct safeguards measurements of 235 U/ 238 U and 240 Pu/ 239 Pu in unseparated samples have also been investigated .…”

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confidence: 99%

“…The plutonium content of such a sample can be reduced to a ratio of about 0.02 Pu/U (g·g –1 ) in the purified uranium fraction by chemical purification of the uranium fraction applying the optimized separation procedure described in the Materials and Methods section of this article. Double rhenium filament assemblies were used in most of the studies using TIMS for isotope amount ratio measurements of uranium and plutonium, respectively, including 238 Pu in the presence of 238 U and vice versa. ,− In order to separate the interfering uranium and plutonium signals, interfering element correction (IEC), ,, peak fitting, and the continuous heating method , were applied.…”

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Optimized Chemical Separation and Measurement by TE TIMS Using Carburized Filaments for Uranium Isotope Ratio Measurements Applied to Plutonium Chronometry

et al. 2016

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An optimized method is described for U/Pu separation and subsequent measurement of the amount contents of uranium isotopes by total evaporation (TE) TIMS with a double filament setup combined with filament carburization for age determination of plutonium samples. The use of carburized filaments improved the signal behavior for total evaporation TIMS measurements of uranium. Elevated uranium ion formation by passive heating during rhenium signal optimization at the start of the total evaporation measurement procedure was found to be a result from byproducts of the separation procedure deposited on the filament. This was avoided using carburized filaments. Hence, loss of sample before the actual TE data acquisition was prevented, and automated measurement sequences could be accomplished. Furthermore, separation of residual plutonium in the separated uranium fraction was achieved directly on the filament by use of the carburized filaments. Although the analytical approach was originally tailored to achieve reliable results only for the (238)Pu/(234)U, (239)Pu/(235)U, and (240)Pu/(236)U chronometers, the optimization of the procedure additionally allowed the use of the (242)Pu/(238)U isotope amount ratio as a highly sensitive indicator for residual uranium present in the sample, which is not of radiogenic origin. The sample preparation method described in this article has been successfully applied for the age determination of CRM NBS 947 and other sulfate and oxide plutonium samples.

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Optimized Chemical Separation and Measurement by TE TIMS Using Carburized Filaments for Uranium Isotope Ratio Measurements Applied to Plutonium Chronometry

et al. 2016

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“…Jain and colleagues studied evaporation and ionization of uranium and plutonium in TIMS. 317 Polyatomic ions are a cause of interference in inductively-coupled plasma, spark source and glow discharge mass spectrometry, but were shown to be useful in TIMS for the determination of atomic ratios of elements. 318 Taking the Li 2 BO 2 + ion as an example, the 6 Li/ 7 Li or 10 B/ 11 B ratios of unknown samples were determined with the molecular ion beam method of isotope analysis.…”

Section: Nuclear Chemistrymentioning

confidence: 99%

Mass Spectrometry in India

Vairamani

Prabhakar

2012

Eur J Mass Spectrom (Chichester)

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All rights reserved EUROPEAN JOURNAL OF MASS SPECTROMETRY This review highlights the research in mass spectrometry carried out all over India, with a focus on the last two decades. There has been a phenomenal increase in the use of mass spectrometers in India during the last decade following the introduction, at the beginning of the 21st century, of rugged electrospray ionization sources for the commercially available instruments, with applications such as pharmacokinetics and bio-equivalence drug studies, pesticide residue analysis and proteomics. There have been more papers published in these areas than could be fully covered in this article. This review covers mostly research in mass spectrometry carried out continuously in institutions where advanced facilities for mass spectrometry are functional. Researchers in India, with some notable exceptions, have always used and still use commercial mass spectrometers in their various areas of research, rather than develop their unique instruments. The review is divided into three parts: organic, elemental (or atomic) and biological mass spectrometry. Organic mass spectrometry Organic and bio-organic chemistry Research in organic mass spectrometry in the early years was mainly focused on the study of mass spectral fragmentation of different classes of new compounds,and was initiated in the 1960s by the late Das and his colleagues from the National Chemical Laboratory (NCL), Pune. The first double-focusing mass spectrometer (CEC-110 B) was installed at NCL for high-resolution mass measurements. The compounds studied by Das and his colleagues included aromatic amides, Benzophenanthridine derivatives, norses

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“…Previous studies [1][2][3] from our laboratory demonstrate the formation of atomic and molecular ions (M + and MO + ) using synthetic mixtures of U and Pu in different ratios. These studies [2] showed that it was possible to produce UO + ions in the absence of PuO + by using a multiple filament assembly heated under specific conditions.…”

Section: Introductionmentioning

confidence: 98%

A novel method for trace uranium determination in plutonium by thermal ionisation mass spectrometry

Alamelu

2007

Journal of Alloys and Compounds

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Studies on the evaporation and ionisation behaviour of uranium and plutonium in thermal ionisation mass spectrometry

Cited by 13 publications

References 23 publications

Optimized Chemical Separation and Measurement by TE TIMS Using Carburized Filaments for Uranium Isotope Ratio Measurements Applied to Plutonium Chronometry

Optimized Chemical Separation and Measurement by TE TIMS Using Carburized Filaments for Uranium Isotope Ratio Measurements Applied to Plutonium Chronometry

Mass Spectrometry in India

A novel method for trace uranium determination in plutonium by thermal ionisation mass spectrometry

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