Use of thin collodion films to prevent recoil-ion contamination of alpha-spectrometry detectors

Inn, Kenneth G. W.; Hall, EF; Woodward, John T.; Stewart, Brandy D.; Pöllänen, R; Selvig, L.; Turner, Shirley; Outola, Iisa; Nour, S.; Kurosaki, Hiromu; LaRosa, J.; Schultz, Michael K.; Lin, Zhichao; Yu, Zhu; McMahon, C. A.

doi:10.1007/s10967-008-0516-y

Cited by 22 publications

(14 citation statements)

References 3 publications

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“…Once dry, the filters were mounted on stainless steel planchettes (31.75 mm outer diameter, AF Murphy, Quincy, MA, USA). Finally, to prevent contamination of the alpha detectors resulting from daughter recoil, thin films consisting of iso-amyl acetate and collodion were placed directly on the source as we described previously [30].…”

Section: Source Preparation and Alpha Spectrometrymentioning

confidence: 99%

A chromatographic separation of neptunium and protactinium using 1-octanol impregnated onto a solid phase support

Knight

Nelson

Eitrheim

et al. 2015

J Radioanal Nucl Chem

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We have developed a new chromatographic method to efficiently separate and isolate neptunium (Np) and protactinium (Pa), based on the selective extraction of protactinium by primary alcohols. The effectiveness of the new technology is demonstrated by efficient separation of 233 Pa from parent radionuclide 237 Np, using a hydrochloric acid mobile-phase medium. Our new approach reproducibly isolated 233 Pa tracer with a yield of 99 ± 1 % (n = 3; radiochemical purity 100 %) and enabled chemical recovery of 237 Np parent material of 92 ± 3 % (radiochemical [99 %) for future 233 Pa tracer preparations. Compared to previous methods, the new approach reduces radioactive inorganic and organic waste; simplifies the separation process by eliminating cumbersome liquidliquid extractions; and allows isolation of radiochemicallypure fractions in less than 1 h. Graphical Abstract 50 150 250 350 Energy, keV 237 Np 9 M HCl 233 Pa 1 M HCl 30 mL 60 mL 0 mL γ: 311 keV α: 4.8 MeV Energy,

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Section: Source Preparation and Alpha Spectrometrymentioning

confidence: 99%

A chromatographic separation of neptunium and protactinium using 1-octanol impregnated onto a solid phase support

Knight

Nelson

Eitrheim

et al. 2015

J Radioanal Nucl Chem

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“…These thin films have been demonstrated to have no effect on the alpha emission detection efficiency or spectra resolution. (Inn et al, 2008). Alpha-counting sources were counted for approximately 168 h, with a matched count-time background subtraction of each region of interest (ROI) applied to obtain background corrected integrated count rates.…”

Section: Methodsmentioning

confidence: 99%

A simple-rapid method to separate uranium, thorium, and protactinium for U-series age-dating of materials

Knight

Eitrheim

Nelson

et al. 2014

Journal of Environmental Radioactivity

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Uranium-series dating techniques require the isolation of radionuclides in high yields and in fractions free of impurities. Within this context, we describe a novel-rapid method for the separation and purification of U, Th, and Pa. The method takes advantage of differences in the chemistry of U, Th, and Pa, utilizing a commercially-available extraction chromatographic resin (TEVA) and standard reagents. The elution behavior of U, Th, and Pa were optimized using liquid scintillation counting techniques and fractional purity was evaluated by alpha-spectrometry. The overall method was further assessed by isotope dilution alpha-spectrometry for the preliminary age determination of an ancient carbonate sample obtained from the Lake Bonneville site in western Utah (United States). Preliminary evaluations of the method produced elemental purity of greater than 99.99% and radiochemical recoveries exceeding 90% for U and Th and 85% for Pa. Excellent purity and yields (76% for U, 96% for Th and 55% for Pa) were also obtained for the analysis of the carbonate samples and the preliminary Pa and Th ages of about 39,000 years before present are consistent with 14C-derived age of the material.

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“…The electrodeposited uranium sources were measured with EG&G Ortec Octete alpha spectrometers (Oak Ridge TN, USA), having 450 mm 2 planar, ion-implanted Si detectors. Thin films prepared from collodion were interposed between sources and detectors to prevent recoil contamination of the detectors by 232 U progeny [26]. The sample sizes were chosen to produce sources with approximately 1 Bq each of 234 U and 238 U and a source deposit thickness (as uranium oxide) of no more than about 60 µg cm −2 , to minimize α energy straggling in the source.…”

Section: Isotope Dilution Analysismentioning

confidence: 99%

Natural Uranium Radioactivity Solution Standard: SRM 4321d

Collé

Laureano-Pérez

Nour

et al. 2017

J. RES. NATL. INST. STAN.

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brian.zimmerman@nist.gov leticia.pibida@nist.gov denis.bergeron@nist.gov A new natural uranium solution standard has been produced and will be disseminated by the National Institute of Standards and Technology (NIST) as Standard Reference Material 4321d. The standard is certified for the massic activities of 234 U, 235 U, and 238 U in solution, and it is based on isotopic mass data for the metallic Certified Reference Material (CRM) 112-A (originally issued as SRM 960) that was obtained from THE U.S. Department of Energy, New Brunswick Laboratory. The metallic CRM was chemically cleaned, dissolved, and gravimetrically diluted to prepare a master solution, which was quantitatively dispensed into 5 mL aliquots that were contained within flame-sealed glass ampoules for each SRM unit. Homogeneity among SRM units, verifying solution homogeneity, was substantiated by photonic-emission integral counting with a NaI(Tl) well counter. Confirmatory measurements were performed by liquid scintillation counting for the total massic activity, and by isotope dilution α spectrometry for the 234 U and 238 U massic activities. 1 A Standard Reference Material® (SRM), trademarked and disseminated by NIST, is a certified reference material that is issued with a certificate that provides the value of the specified property, its associated uncertainty, and a statement of metrological traceability.The standardization of SRM 4321d for the massic activities of 234 U, 235 U, and 238 U is linked, both in terms of origin and certified values, to an isotopic mass standard, Certified Reference Material (CRM) 112-A [5], which was obtained from the U.S. Department of Energy, New Brunswick Laboratory (NBL). This CRM consists of a natural uranium metal bar having an assay purity of (99.975 ± 0.006) % by mass and a relative atomic mass of 238.028 918 ± 0.000 012, with certified values for atom percentages of 234 U, 235 U, and 238 U isotopes (given in the second column of Table 1), 2 as obtained from mass spectrometry. Each unit consists of a metal bar of nominal mass, ranging from 4 g to over 25 g, as listed on the container. The CRM has a significant amount of surface oxide that requires chemical cleaning before use.

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Use of thin collodion films to prevent recoil-ion contamination of alpha-spectrometry detectors

Cited by 22 publications

References 3 publications

A chromatographic separation of neptunium and protactinium using 1-octanol impregnated onto a solid phase support

A chromatographic separation of neptunium and protactinium using 1-octanol impregnated onto a solid phase support

A simple-rapid method to separate uranium, thorium, and protactinium for U-series age-dating of materials

Natural Uranium Radioactivity Solution Standard: SRM 4321d

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