The importance of the beta spectrum calculation for accurate activity determination of 63 Ni by means of liquid scintillation counting

Kossert, Karsten; Mougeot, X.

doi:10.1016/j.apradiso.2015.03.017

Cited by 33 publications

(14 citation statements)

References 10 publications

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“…It is possible that this systematic difference between the techniques indicates a problem with the beta spectrum used in the efficiency calculations. Kossert and Mougeot recently showed that the inclusion of atomic screening and exchange effects in the beta spectrum calculations brought TDCR and CNET measurements on 63 Ni into accord, revealing a general overestimate of the counting efficiencies (resulting in an underestimate of the activities) resulting from the use of the uncorrected beta spectrum (Kossert and Mougeot, 2015). …”

Section: Resultsmentioning

confidence: 99%

Comparison of 14C liquid scintillation counting at NIST and NRC Canada

Bergeron

Galea

Laureano-Pérez

et al. 2016

Applied Radiation and Isotopes

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An informal bilateral comparison of 14C liquid scintillation (LS) counting at the National Research Council of Canada (NRC) and the National Institute of Standards and Technology (NIST) has been completed. Two solutions, one containing 14C-labeled sodium benzoate and one containing 14C-labeled n-hexadecane, were measured at both laboratories. Despite observed LS cocktail instabilities, the two laboratories achieved accord in their standardizations of both solutions. At the conclusion of the comparison, the beta spectrum used for efficiency calculations was identified as inadequate and the data were reanalyzed with different inputs, improving accord.

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Section: Resultsmentioning

confidence: 99%

Comparison of 14C liquid scintillation counting at NIST and NRC Canada

Bergeron

Galea

Laureano-Pérez

et al. 2016

Applied Radiation and Isotopes

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“…The cuboid (50 × 50 × 15 µm 3 ) Au:Er thermometer is fixed to this absorber by ultrasonic cold welding so as to assure a metallic contact and efficient heat transfer [246]. The main aim of this project is to provide information assisting dose calculations for medical purposes [247], for decay heat calculations in the nuclear power industry [246,248], and to reduce uncertainties in activity measurements with liquid scintillators in ionizing radiation metrology [249]. Spectrum shape measurements performed on 241 Pu and 63 Ni [250,251] with β-endpoint energies of 20.8 keV and 67.2 keV, respectively, have allowed investigating the theoretical corrections at such low energies.…”

Section: β-Spectrum Shapementioning

confidence: 99%

New physics searches in nuclear and neutron β decay

González–Alonso

Naviliat‐Cuncic

Severijns

2019

Progress in Particle and Nuclear Physics

244

282

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The status of tests of the standard electroweak model and of searches for new physics in allowed nuclear β decay and neutron decay is reviewed including both theoretical and experimental developments. The sensitivity and complementarity of recent and ongoing experiments are discussed with emphasis on their potential to look for new physics. Measurements are interpreted using a model-independent effective field theory approach enabling to recast the outcome of the analysis in many specific new physics models. Special attention is given to the connection that this approach establishes with high-energy physics. A new global fit of available β-decay data is performed incorporating, for the first time in a consistent way, superallowed 0 + → 0 + transitions, neutron decay and nuclear decays. The constraints on exotic scalar and tensor couplings involving left-or right-handed neutrinos are determined while a constraint on the pseudoscalar coupling from neutron decay data is obtained for the first time as well. The values of the vector and axial-vector couplings, which are associated within the standard model to V ud and g A respectively, are also updated. The ratio between the axial and vector couplings obtained from the fit under standard model assumptions is C A /C V = −1.27510(66). The relevance of the various experimental inputs and error sources is critically discussed and the impact of ongoing measurements is studied. The complementarity of the obtained bounds with other low-and high-energy probes is presented including ongoing searches at the Large Hadron Collider.

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“…They noted that gamma- and x-ray scattering from the optical chamber can produce a non-negligible increase in the probability of interaction in the scintillant (as demonstrated by Cassette et al, 2006), that positron annihilation in flight—occurring with ≈ 0.6 % probability for 64 Cu positrons—reduces the energy deposited in the scintillant, and that screening and exchange effects may need to be considered in the calculation of the 64 Cu β +/− spectrum shapes. Kossert and Mougeot (2015) demonstrated the potential importance of screening and exchange corrections very clearly in the case of 63 Ni, and Kossert et al (2014) suggested they may also be important in the 64 Cu case. We have previously noted that when this problem arises, it is more pronounced at lower counting efficiencies (Bergeron et al, 2016), which is consistent with our current results.…”

Section: Discussionmentioning

confidence: 97%

Standardization of 64Cu activity

Bergeron

Cessna

Fitzgerald

et al. 2018

Applied Radiation and Isotopes

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The complex decay scheme that makes 64Cu promising as both an imaging and therapeutic agent in medicine also makes the absolute measurement of its activity challenging. The National Institute of Standards and Technology (NIST) has completed a primary activity standardization of a 64CuCl2 solution using the 4πβ(LS)-γ(NaI) live-timed anticoincidence (LTAC) counting method with a combined standard uncertainty of 0.51 %. Two liquid scintillation (LS) counting methods were employed for confirmatory measurements. Secondary measurements were made by high-purity germanium detectors, pressurized ionization chambers (IC), and a well-type NaI(Tl) counter. Agreement between the LTAC-based standard and standards from other laboratories was established via IC calibration factors. Poor agreement between methods and with theoretical IC responses may indicate a need for improved β+/− branching probabilities and a better treatment of β+/− spectra.

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The importance of the beta spectrum calculation for accurate activity determination of 63 Ni by means of liquid scintillation counting

Cited by 33 publications

References 10 publications

Comparison of 14C liquid scintillation counting at NIST and NRC Canada

Comparison of 14C liquid scintillation counting at NIST and NRC Canada

New physics searches in nuclear and neutron β decay

Standardization of 64Cu activity

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