The resin bead as a thermal ion source: A sims study

Smith, David H.; Christie, W. H.; Eby, R.E.

doi:10.1016/0020-7381(80)85064-9

Cited by 43 publications

(22 citation statements)

References 14 publications

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“…The improvement in efficiency and detection limits is mainly due to the use of resin bead load instead of normal liquid load, and the addition of carbon. This is because resin bead loads improve focus and ion transmission by reducing the geometrical size of the sample and act as reservoir and carbon source [146,149]. The carbon layer additionally enhances the work function of the ionizer materials (e.g., rhenium) and ion beams stability, and reduced isotope mass fractionation has been observed using carbon coating [149].…”

Section: Resultsmentioning

confidence: 99%

“…Samples are air-dried under a hood. The resin bead acts as a 'point' source (improving the focus), as a carbon source (improving work function and reducing the oxide formation), and as an analyte reservoir [146].…”

Section: Bead Load Preparationmentioning

confidence: 99%

“…For neodymium isotope ratio analysis using multiple Faraday cups, a value of 146 Nd/ 144 Nd = 0.7219 was used as fractionation correction, and 147 Sm/ 144 Sm = 4.8387, 147 Sm/ 148 Sm = 1.3274, and 147 Sm/ 150 Sm = 2.0270 to correct for Sm interferences. 140 Ce was monitored but no interference correction is necessary for the radiogenic 143 Nd/ 144 Nd atom ratio of interest.…”

Section: Data Evaluationmentioning

confidence: 99%

“…Highest precisions in isotope ratio analysis are traditionally reported using MC-TIMS instruments, with relative standard deviations as low as 0.01% or better [107,186]. Various methods have been developed to enhance the total/ionization efficiency (and thus the detection limit and precision) of TIMS, e.g., using carbon additives, benzene gas, and resin bead loads [110,[145][146][147]178], or platinum coating and electrodeposition [148]. These methods aim to reduce the formation of oxides, improve beam focus and ion transmission by reducing the spatial extent of the sample load, or enhance the work function of the ionizer materials (usually rhenium, tantalum, tungsten or platinum).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Isotope ratio analysis of actinides, fission products, and geolocators by high-efficiency multi-collector thermal ionization mass spectrometry

Bürger

Riciputi

Bostick

et al. 2009

International Journal of Mass Spectrometry

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Section: Resultsmentioning

confidence: 99%

Section: Bead Load Preparationmentioning

confidence: 99%

Section: Data Evaluationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Isotope ratio analysis of actinides, fission products, and geolocators by high-efficiency multi-collector thermal ionization mass spectrometry

Bürger

Riciputi

Bostick

et al. 2009

International Journal of Mass Spectrometry

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“…The source f i l a m e n t arrangement i s a c r i t i c a l component o f any Furthermore, the presence of carbon has been shown to counteract Pu diffusion on the filament surface, so that a point source for good ion optics is maintained (Smith et al, 1980). At S.R.L.…”

Section: L I T Y Where a L L O F T H E F I L A M E N T F A B R I C mentioning

confidence: 99%

Plutonium isotopes in the North Atlantic

Buesseler¹

1986

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The author hereby g r a n t s t o MIT and WHO1 permission t o reproduce and d i s t r i b u t e copies o f t h i s t h e s i s document i n whole o r i n p a r t . Signature o f Author / J o i n t Program i n Oceanography, Massachusetts I n s t i t u t e o f Technology and Woods Hole Oceanographic I n s t i t u t i o n , and t h e Department o f Earth, Atmospheric, and Planetary Sciences, Massachusetts I n s t i t u t e o f Technology C e r t i f i e d by Edward R. ~h o i k & i t z , ~h e s i s ~u -~e r v i sc6Accepted by -./,, , Edward Boyle, Chair, J o i n t tommlttee f o r Chemical Oceanography, Massachusetts I n s t i t u t e o f Technology/Woods Hole Oceanographic I n s t i t u t i o n ABSTRACT The a r t i f i c i a l r a d i o n u c l i d e Plutonium (Pu) has been introduced i n t o t h e environment p r i m a r i l y as f a l l o u t from atmospheric nuclear weapons t e s t i n g d u r i n g t h e 1950's and 1960's. E a r l i e r s t u d i e s o f Pu geochemist r y a r e g e n e r a l l y based upon t h e measurement o f t h e combined a c t i v i t i e s o f 2 3 9~u and 2 4 9~u (detected by alpha-counting and w r i t t e n as 239,240 Pu) and assume an i d e n t i c a l geochemical behavior f o r Pu from any o f i t s f a l l o u t sources. A major focus o f t h i s t h e s i s i s t h e development o f a mass spectrometric (m.s.) technique f o r t h e a n a l y s i s o f Pu i n marine sediments, pore waters, sediment t r a p m a t e r i a l and sea water from t h e North A t l a n t i c . With t h e m.s. technique, n o t o n l y i s t h e d e t e c t i o n l i m i t f o r 2 3 9 ' 2 4 0~u increased by over an order-of-magni tude, b u t t h e 2 4 0~u and 2 3 9~u isotopes can be separated as w e l l . The increased s e n s i t i v i t y f o r Pu provided by m.s. allowed me t o measure Pu i n deep-sea pore waters f o r t h e f i r s t time. Pore water studies a r e s e n s i t i v e i n d i c a t o r s o f e a r l y d i a g e n e t i c r e a c t i o n s , and can be used t o examine t h e unresolved question o f t h e e x t e n t o f Pu remobili z a t i o n out o f marine sediments. Along a t r a n s e c t o f cores ranging from h i g h l y reducing muddy sediments on t h e s h e l f t o more o x i c and carbonater i c h sediments i n t h e deep-sea, I have found t h a t t h e s o l u b i l i t y o f Pu i s predominantly c o n t r o l l e d by t h e d i s t r i b u t i o n o f Pu i n t h e s o l i dphase. The c a l c u l a t e d 2 3 9 9 2 4 0~~ distribution coefficients (Kd = dpm per kg on solids/dpm per kg i n s o l u t i o n ) range from 0.2-23 x lo4, w i t h some suggestion o f a t r e n d towards lower values i n t h e deeper cores 4 (Kdls 4 0 i n cores from water depths >2500m). D i f f u s i v e f l u x calcul a t i o n s based upon t h e observed Pu pore water g r a d i e n t s suggest t h a t since i t s i n t r o d u c t i o n , n e g l i g i b l e Pu has been r e m o b i l i z e d o u t o f t h e 2 3 sediments a t a l l o f t h e s i t e s . On a time scale o f 10 -10 years however, Pu r e m o b i ...

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Redistribution of boron during thermal oxidation of silicon studied by SIMS using Ar⁺ bombardment and the MISR method. Part I: Methodology

Michiels

Butaye

Adams

1989

Surface & Interface Analysis

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Quantitative depth profiling of boron through SiO,/Si interfaces, when profiling with AT+, is complicated by the matrix effects. The presence of oxygen affects the sensitivity of boron by three orders of magnitude and accurate determination of the distribution coefficient of boron at the interface is only possible when the matrix effects can be eliminated or taken into account in the quantification. By using matrix-sensitive correlation factors, a sensitivity curve of boron at different primary ion current densities was established. This relation shows a good long-term reproducibility. Moreover, a physical interpretation of the shape of the sensitivity curve of boron is given by comparison with pure Si and SiO, . Tentative explanations for the hehaviour of different Si,O;+ species in conditions of varying primary ion current density and oxygen backfill are given. The influence of the oxygen backfill pressure on the sputter rate of silicon was investigated and problems arising in the profilation of boron in SiOJSi interfaces were addressed. Practical applications of the described methodology are discussed in Part I1 of this series.

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The resin bead as a thermal ion source: A sims study

Cited by 43 publications

References 14 publications

Isotope ratio analysis of actinides, fission products, and geolocators by high-efficiency multi-collector thermal ionization mass spectrometry

Isotope ratio analysis of actinides, fission products, and geolocators by high-efficiency multi-collector thermal ionization mass spectrometry

Plutonium isotopes in the North Atlantic

Redistribution of boron during thermal oxidation of silicon studied by SIMS using Ar⁺ bombardment and the MISR method. Part I: Methodology

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The resin bead as a thermal ion source: A sims study

Cited by 43 publications

References 14 publications

Isotope ratio analysis of actinides, fission products, and geolocators by high-efficiency multi-collector thermal ionization mass spectrometry

Isotope ratio analysis of actinides, fission products, and geolocators by high-efficiency multi-collector thermal ionization mass spectrometry

Plutonium isotopes in the North Atlantic

Redistribution of boron during thermal oxidation of silicon studied by SIMS using Ar+ bombardment and the MISR method. Part I: Methodology

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Redistribution of boron during thermal oxidation of silicon studied by SIMS using Ar⁺ bombardment and the MISR method. Part I: Methodology