Measurement of the shape-factor functions of the long-lived radionuclides 87Rb, 40K and 10Be

Carles, A. Grau; Kossert, Karsten

doi:10.1016/j.nima.2006.11.064

Cited by 19 publications

(6 citation statements)

References 40 publications

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“…The mean energy for the Leutz et al 1965 [57] shape factor is identical to that reported by Mougeot 2015 [44]. Recent high precision measurements of beta spectra have been conducted [59], proposing a shape factor of the form C(W ) = λ 1 p 6 + λ 2 q 6 + 7p 2 q 2 (p 2 + q 2 ) for 40 K, with λ 1 = 1.8 and λ 2 = 1.23, to resolve discrepancies between cutoff energy yield and maximum point energy. However, the authors note that this form of shape factor fails Cherenkov counting tests.…”

Section: Mean Beta − Decay Energysupporting

confidence: 78%

Review of nuclear data for naturally occurring radionuclides applied to environmental applications

2019

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Accurate nuclear data, commonly using evaluated libraries, is essential in many applications, allowing confidence in derived parameters. An approach to assess the confidence with which these data can be used is proposed, not previously reported, comparing nuclear data presented by different evaluations. Variations between evaluations are used as an indication of potential inaccuracies in the nuclear data or evaluation procedure, and the relevant primary literature reviewed more fully. Applying this approach to naturally occurring radionuclides has identified eight radionuclides where the evaluations differ significantly. Where recommended data are supported by a single set of high precision measurements, independent verification of those measurements will increase confidence in the accuracy of the data (214 Bi and 214 Pb). Further measurements should be conducted where the decay schemes are incomplete (228 Ac and 228 Ra). For 40 K, the mean beta energy in all the evaluations has been calculated using an incorrect shape factor, and log ft and branching ratios have been calculated using an inappropriate program. Precise measurements of beta spectra will allow the use of experimentally derived shape factors for the calculation of mean beta energies (40 K and 210 Bi). Parameters used for infinite matrix dose rate and geothermal heat production calculations have been derived for the data discussed here.

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Section: Mean Beta − Decay Energysupporting

confidence: 78%

Review of nuclear data for naturally occurring radionuclides applied to environmental applications

2019

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“…(1965) shape factor is identical to that reported by Mougeot (2015). Recent high precision measurements of beta spectra have been conducted (Carles & Kossert 2007), proposing a shape factor of the form ‫ܥ‬ሺܹሻ = ߣ ଵ ‫‬ + ߣ ଶ ‫ݍ‬ + ‫7‬ ଶ ‫ݍ‬ ଶ ሺ‫‬ ଶ + ‫ݍ‬ ଶ ሻ for 40 K, with λ 1 =1.8 and λ 2 =1.23, to resolve discrepancies between cutoff energy yield and maximum point energy. However, the authors note that this form of M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT 10 shape factor fails Cherenkov counting tests, and in correspondence stated that they consider the spectrum generated by BetaShape using the Leutz et.al.…”

Section: Examination Of Evaluated Data For Naturally Occurring Radionuclidessupporting

confidence: 52%

Dose rate conversion parameters: Assessment of nuclear data

Cresswell

Carter

Sanderson

2018

Radiation Measurements

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The dating of materials using stored dose methods requires accurate determination of the environmental dose rate. The calculation of dose rates from radionuclide concentrations requires conversion parameters derived from nuclear data (half life, decay energies and intensities, and branching ratios). With the substantial body of primary data, it is convenient to use data from evaluated libraries. These libraries show variations reflecting both newer data unavailable to earlier evaluations and the relative importance given to different data sets by the evaluators. Commonly used conversion parameters derive from the Evaluated Nuclear Structure Data File (ENSDF), either directly or from secondary publications, with new tabulations produced in recent years following revisions to this library. Other international evaluations of nuclear data include the NEA/OECD supported JEF2.2 and JEFF3.11 evaluations, and the Decay Data Evaluation Project (DDEP). A technique comparing different evaluations to identify data that can not be confidently used has been developed.These differences have been investigated with an evaluation of underlying nuclear data.Particular radionuclides of interest are discussed; 214 Bi where recent evaluations depend on a single high precision data set, 228 Ac where the decay scheme is incomplete and further measurements are required, and 40 K where the mean beta energy has been calculated in the evaluations using an incorrect shape factor. Revised dose rate conversion factors have been

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“…Be was recently confirmed by [33], and it induces a shift to the high-energy part of the spectrum yielding a high counting efficiency.…”

Section: Efficiency Calculations and Determination Of The Activity Comentioning

confidence: 85%

Determination of the 10Be half-life by multicollector ICP-MS and liquid scintillation counting

Chmeleff

Blanckenburg

Kossert

et al. 2010

Nuclear Instruments and Methods in Physics Research Section B:

832

525

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A new method was designed and used for determining the half-life of the isotope 10 Be. The method is based on (1) accurate 10 Be/ 9 Be measurements of 9 Be-spiked solutions of a 10 Be-rich master solution using multicollector ICP mass spectrometry (MC-ICP-MS) and (2) liquid scintillation counting (LSC) using the CIEMAT/NIST method for determining the activity concentrations of the solutions whose 10 Be concentrations were determined by mass spectrometry. Important requirements for the success of this approach a) was the previous coating of glass ampoules filled for counting experiments with 9 Be, thereby reducing the risk of the adsorptive loss of 10 Be; b) the removal of Boron from solutions to be measured by MC-ICP-MS by cation chromatography without the introduction of mass fractionation and c) the accurate determination of the mass bias of 10 Be/ 9 Be measurements by ICP-MS which are always affected by the space-charge effect. The mass bias factor was determined to be 1.1862 ± 0.071 for 10 Be/ 9 Be from careful fitting and error propagation of ratios of measured Li, B, Si, Cr, Fe, Cu, Sr, Nd, Hf, and Tl standard solutions of known composition under the same measurement conditions. Employing this factor, an absolute 10 Be/ 9 Be ratio of 1.464 ± 0.014 was determined for a first dilution of the 10 Be-rich master solution. This solution is now available as an absolute Be ratio standard in AMS measurements. Finally, a half-life of (1.386 ± 0.016) My (standard uncertainty) was calculated. This value is much more precise than previous estimates and was derived from a fully independent set of experiments. In a parallel, fully independent study using the same master solution, [35] have determined a half life of (1.388 ± 0.018) My. The combined half life and uncertainty amounts to (1.387 ± 0.012) My. We suggest the use of this value in nuclear studies and in studies that make use of cosmogenic 10 Be in environmental and geologic samples.

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Measurement of the shape-factor functions of the long-lived radionuclides 87Rb, 40K and 10Be

Cited by 19 publications

References 40 publications

Review of nuclear data for naturally occurring radionuclides applied to environmental applications

Review of nuclear data for naturally occurring radionuclides applied to environmental applications

Dose rate conversion parameters: Assessment of nuclear data

Determination of the 10Be half-life by multicollector ICP-MS and liquid scintillation counting

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