Determination of half-lives by γ-ray spectrometry: Improvement of procedure and precision

Mignonsin, E.P.

doi:10.1016/0969-8043(94)90142-2

Cited by 14 publications

(6 citation statements)

References 15 publications

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“…As Eisenhart pointed out, these practices have consequences for the users of these papers. As an example from our own work, a newly published half-life for 76 As [19] was accepted by the evaluators because of a plausible (but novel and incomplete) description of the uncertainties in the measurement, even though this value conflicted with previous measurements in the literature (notably a set of seven determinations with six different kinds of detectors [20]). This half-life would have led to an inaccurate INAA value for Arsenic Implant in Silicon (SRM 2134) had we used it in our measurements [21].…”

Section: Data Quality In Practicementioning

confidence: 99%

Believable statements of uncertainty and believable science

Lindstrom

2016

J Radioanal Nucl Chem

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Nearly fifty years ago, two landmark papers appeared that should have cured the problem of ambiguous uncertainty statements in published data. Eisenhart’s paper in Science called for statistically meaningful numbers, and Currie’s Analytical Chemistry paper revealed the wide range in common definitions of detection limit. Confusion and worse can result when uncertainties are misinterpreted or ignored. The recent stories of cold fusion, variable radioactive decay, and piezonuclear reactions provide cautionary examples in which prior probability has been neglected. We show examples from our laboratory and others to illustrate the fact that uncertainty depends on both statistical and scientific judgment.

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Section: Data Quality In Practicementioning

confidence: 99%

Believable statements of uncertainty and believable science

Lindstrom

2016

J Radioanal Nucl Chem

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“…The apparent intensity of the 689 keV line relative to that of the 333 keV line emitted in the EC decay of 196 Au g was less than 1.3% in all cases. The sum lines at 336 and 689 keV were found to decay with the same apparent halflives as 196 Au m2 and 196 Au g , respectively, indicating that coincident summing is far more important than is random summing in these experiments [104][105][106]. The potential effects of summing in the data analysis presented here were ignored.…”

Section: Sample Sample Goldmentioning

confidence: 75%

Nuclear spectrometry of 9.6 h ¹⁹⁶Au^m2 and the reaction of ¹⁹⁷Au with fast neutrons

Moody

Gharibyan

Shaughnessy

et al. 2020

J. Phys. G: Nucl. Part. Phys.

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The neutron activation of gold is the basis of an implosion performance diagnostic at the National Ignition Facility at Lawrence Livermore National Laboratory. In support of this diagnostic, a series of γ-ray spectrometric measurements of the decay of 196Au m2 (J π = 12−) was performed to improve the currently accepted literature values of the nuclear data associated with its half-life, γ-ray energies, and γ-ray intensities. It was determined that 196Au m2 decays with a half-life of 9.603 h ± 0.23%. The relative intensities of the γ rays emitted during its decay were also measured, and an absolute decay branch of 0.3352 ± 2.9% was determined for the emission of the 188.2 keV photon, which arises from a nuclear transition whose multipolarity is predominantly M1. Properties of other products arising in the reaction of 197Au with fast neutrons were measured, as were selected production cross sections. The 196Au m2/196Au g isomer ratio measured in the 197Au(n, 2n) reaction at 14.1 MeV was found to be 0.0731 ± 2.6%.

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“…In the pursuit of high-accuracy measurements of arsenic in silicon by instrumental neutron activation analysis, 1 we found that the most recently published 2 and compiled 3 half-life of 76 As (T 1/2 = 1.0778±0.0020 d) did not agree with our data as well as the earlier recommended value of 1.097±0.003 d. [4][5][6] We therefore sought to remeasure this half-life more accurately.…”

Section: Introductionmentioning

confidence: 73%

“…Our value differs greatly from MIGNONSIN's recent result. 2 We tested our algorithms by measuring the well-characterized half-life of 198 Au, collecting 250 . 10 6 net counts in 83 spectra over 20 days.…”

Section: Discussionmentioning

confidence: 99%

The half-life of 76As

Lindstrom

Blaauw

Fleming

2003

Journal of Radioanalytical and Nuclear Chemistry

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In the course of making high-accuracy measurements of arsenic, we found that the most recently published and compiled half-life of 76 As did not agree with our data as well as the earlier accepted value. To redetermine this parameter, 76 As sources were measured on four Ge gamma detector systems, and an exponential function was fitted to the decay data by two different nonlinear least-squares methods. We obtained T 1/2 = 1.09379 days with a standard uncertainty of 0.00045 days. This result is 1.5% higher than the most recent value, but is in agreement with the older, less precise, consensus value.

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Determination of half-lives by γ-ray spectrometry: Improvement of procedure and precision

Cited by 14 publications

References 15 publications

Believable statements of uncertainty and believable science

Believable statements of uncertainty and believable science

Nuclear spectrometry of 9.6 h ¹⁹⁶Au^m2 and the reaction of ¹⁹⁷Au with fast neutrons

The half-life of 76As

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Determination of half-lives by γ-ray spectrometry: Improvement of procedure and precision

Cited by 14 publications

References 15 publications

Believable statements of uncertainty and believable science

Believable statements of uncertainty and believable science

Nuclear spectrometry of 9.6 h 196Aum2 and the reaction of 197Au with fast neutrons

The half-life of 76As

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Nuclear spectrometry of 9.6 h ¹⁹⁶Au^m2 and the reaction of ¹⁹⁷Au with fast neutrons