Standardization and decay data of 237Np

Woods, M.J.; Woods, D H; Woods, S.A.; Husband, L J; Jerome, S M; Michotte, C; Ratel, G; Crespo, M.T.; Garcı́a-Toraño, E.; Rodríguez, Luis García-Tabarés; Luca, A.; Denecke, B.; Sibbens, G.; Morel, Jean‐Michel; Etcheverry, M; Santry, D.C.; Janßen, H.; Schönfeld, E.; Schötzig, U.

doi:10.1016/s0969-8043(01)00224-x

Cited by 16 publications

(3 citation statements)

References 10 publications

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“…They prepared 233 Pa samples by separating chemically from a sample of 237 Np, and then, used a 4 -coincidence spectrometer to determine the 233 Pa sample disintegration rates and Ge(Li) spectrometers to measure the -ray emission rates. This emission probability had been measured 21) as the EUROMET project (No. 416), and three independent results as 38:5AE0:4%, 38:7AE0:4%, and 37:80AE0:23% were reported.…”

Section: Discussionmentioning

confidence: 99%

Emission Probabilities of Gamma Rays from the Decay of 233Pa and 238Np, and the Thermal Neutron Capture Cross Section of 237Np

Harada¹,

Nakamura²,

Ohta³

et al. 2006

J. Nucl. Sci. Technol.

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In order to determine the thermal neutron capture cross section of 237 Np, the relevant emission probabilities of the 312-keV -ray from the decay of 233 Pa and the 984-keV -ray from the decay of 238 Np are deduced from the ratio of the emission rate to the activity. The emission rate and activity are measured with a Ge detector and a Si detector, respectively. The measured emission probability for 312-keV -ray is 41:6AE0:9% and that for 984-keV -ray is 25:2AE0:5%. The emission probabilities are used to correct the thermal neutron capture cross section of 237 Np reported previously, and gives 168AE6 b. The neutron capture cross section is also determined as 169AE6 b by -ray spectroscopic method. The measured emission probabilities and capture cross section are compared with others from references. By averaging these values deduced by different methods, the value of 169AE4 b is recommended as the thermal neutron capture cross section of 237 Np for 2,200 m/s neutrons.

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Section: Discussionmentioning

confidence: 99%

Emission Probabilities of Gamma Rays from the Decay of 233Pa and 238Np, and the Thermal Neutron Capture Cross Section of 237Np

Harada¹,

Nakamura²,

Ohta³

et al. 2006

J. Nucl. Sci. Technol.

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“…Alpha-particle counting at a defined low solid angle is amongst the most accurate primary standardization methods for alpha-emitting radionuclides, with attainable accuracies around 0.1% [88][89][90][91]. It has been applied in various standardization exercises [17,92,93], but also in the frame of half-life determinations of long-lived radionuclides [94][95][96][97][98][99][100]. A special application is the standardization of radon gas that is condensed on a cold circular disc [56,101,102].…”

Section: Counting At a Defined Solid Angle (Dsa)mentioning

confidence: 99%

Methods for primary standardization of activity

Pommé

2007

Metrologia

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“…Previous standardizations have relied on the equilibrium conditions of 233 Pa with its parent 237 Np, taking advantage of the relative ease of measuring absolute alpha decay of 237 Np rather than beta decay of 233 Pa [8–17]. In some of those works, both nuclides were measured in equilibrium using 4π αβ - γ coincidence [15,16]. The γ -ray emission probabilities ( ) for 233 Pa decay have been evaluated [14,7,18].…”

Section: Introductionmentioning

confidence: 99%

Primary standardization of the massic activity of a 233Pa solution

Fitzgerald

Pibida²

2018

J Radioanal Nucl Chem

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Protactinium-233 (233Pa) is used as a tracer for radiochemical analysis and is of particular interest as an isotope dilution mass spectrometry (IDMS) spike for 231Pa/235U radio-chronometry. To this end, we present massic activity determinations by two methods for a 233Pa solution, which was prepared at Lawrence Livermore National Laboratory (LLNL) and is being characterized at multiple labs as part of a 231Pa reference material production project. One activity determination method was 4πβ-γ anti-coincidence counting in a multi-dimensional extrapolation model, with Monte Carlo corrections. An independent massic activity determination was completed by γ-ray spectrometry using 5 HPGe detectors using 5 γ-ray lines. The anti-coincidence and γ-ray spectrometry results agree and have combined standard uncertainties of about 0.33 % and 1.0 % respectively. In addition, the two methods were combined to derive γ-ray emission probabilities from 233Pa decay.

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Standardization and decay data of 237Np

Cited by 16 publications

References 10 publications

Emission Probabilities of Gamma Rays from the Decay of 233Pa and 238Np, and the Thermal Neutron Capture Cross Section of 237Np

Emission Probabilities of Gamma Rays from the Decay of 233Pa and 238Np, and the Thermal Neutron Capture Cross Section of 237Np

Methods for primary standardization of activity

Primary standardization of the massic activity of a 233Pa solution

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