Production of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Nb</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>91</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>,<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Nb</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><

Greenwood, L.R.; Doran, D.G.; Heinisch, HL

doi:10.1103/physrevc.35.76

Cited by 15 publications

(4 citation statements)

References 16 publications

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“…The gamma spectroscopy conducted on the BF probes revealed that no activated atoms were present; the obtained spectra are analogous to the environmental one. At 105 and 1205 keV, 91Nb produces characteristic peaks [18], with no activated species seen in the spectrum (Figure 13). Thus, the Nb detected by SEM-EDS could be just an artifact, since the Nb and Mo EDS peaks are very close to each other, or the element could have already been inside the bulk Mo as an impurity.…”

Section: Gamma Spectrometrymentioning

confidence: 99%

Investigations on Caesium Dispersion and Molybdenum Coating on SPIDER Components

et al. 2022

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SPIDER is the 100 keV full-size Negative Ion Source prototype of the ITER Neutral Beam Injector, operating at Consorzio RFX in Padova, Italy. The largest Negative Ion Source in the world, SPIDER generates an RF driven plasma from which Deuterium or Hydrogen negative ions are produced and extracted. At the end of 2021, a scheduled long-term shutdown started to introduce major modifications and improvements aiming to solve issues and drawbacks identified during the first three years of SPIDER operations. The first action of the shutdown period was the disassembly and characterization of the SPIDER beam source after removal from the vacuum vessel and its placement inside the clean room. Each component was carefully assessed and catalogued, following a documented procedure. Some source components, i.e., the Plasma Grid, Extraction Grid and Bias Plate, revealed the presence of different and non-uniform red, white and green coatings that might be correlated to back-streaming positive ions impinging on grid surfaces, electrical discharges and caesium evaporation. Thus, several analyses have been carried out to understand the nature of such coatings, with the study still ongoing. The evidence of caesium evaporation and deposition on molybdenum-coated SPIDER components, such as the formation of oxides and hydroxides, is demonstrated through surface characterization analyses with the use of the Scanning Electron Microscope (SEM), X-ray Diffraction (XRD) and X-ray Photoelectron Spectroscopy (XPS).

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Section: Gamma Spectrometrymentioning

confidence: 99%

Investigations on Caesium Dispersion and Molybdenum Coating on SPIDER Components

et al. 2022

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“…Details of the neutron energy spectra have been discussed in previous publications. [2] Iron and niobium dosimetry foils were included with each sample to determine the actual neutron fluence at each sample location using the well-known 54 Fe(n,p) 54 Mn and 93 Nb(n,2n) 92m Nb reactions. A neutron fluence map was then produced for each irradiation; more detailed results have been published previously.…”

Section: Sample Preparation and Irradiationmentioning

confidence: 99%

“…However, production data are scarce for these isotopes since direct measurements must contend with very weak activities in the presence of numerous, stronger activities from competing reactions and impurities. Previously we have reported data for the 27 Al(n,2n) 26 Al (720,000 y)[l], 94 Mo(n,p) 94 Nb (20,300 y), and 92 Mo(n,x) 91ro Nb (700 y) reactions [2]. In this study, we have measured the production of radioisotopes which decay by electron capture or beta decay.…”

Section: Introductionmentioning

confidence: 96%

Analysis of long-lived isotopes by liquid scintillation spectrometry

Bowers

Greenwood

1988

Journal of Radioanalytical and Nuclear Chemistry, Articles

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International Conference on Methods and Applications of Radioanalytical Chemistry Kona,Hawaii S filial Is • April 5-10, 1987 S* Z J 8 "8 § oC'jg The (ubmitted mumcripl hu beeo authored by S .Pol-1-o«S m contractor of the IT. S. Government. Accord-'s g M-.1 .S § c-.1 a inj'y. 'he U. S. Government retain* a nonexdu-S. E i o ^ ^ " 2 5w live, royalty-free liceme to publiih or reproduce E E|-S*|3 go the publuhed form of thil contribution, or allow •-> o. ~ g g gl^-s othen to do io, for U. S. Government purpoiei. E5 *Work supported by the TJ. S. Department of Energy.

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“…The activities were produced during several separate 14 MeV neutron irradiations to high fluences (1017-1018 n/cm 2 ) at the Rotating Target Neutron Source II at Lawrence Livermore National Laboratory. 48 Iron and niobium dosimetry foils were included with each sample to determine the actual neutron fluence at each sample location using the well-known 5 4 Fe(n,p) 5 4 Mn and 9 3 Nb(n,2n) 9 2 Nb reactions.…”

Section: Dosimetry and Damage Analysismentioning

confidence: 99%

Nuclear Technology Programs semiannual progress report, October 1986--March 1987

Battles¹

1988

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Production ofNb91,Nb<

Cited by 15 publications

References 16 publications

Investigations on Caesium Dispersion and Molybdenum Coating on SPIDER Components

Investigations on Caesium Dispersion and Molybdenum Coating on SPIDER Components

Analysis of long-lived isotopes by liquid scintillation spectrometry

Nuclear Technology Programs semiannual progress report, October 1986--March 1987

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