Redetermination of several half-lives

Abzouzi, A.; Antony, M. S.; Ndongué, V. B. Ndocko; Oster, D.

doi:10.1007/bf02165077

Cited by 21 publications

(6 citation statements)

References 28 publications

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“…The t 1/2 determination of 101 Tc has been the topic of many studies as shown in Table 1 38 – 40 . The presently accepted value for the t 1/2 of 101 Tc is 14.22(1) min, which most closely resembles that determined by Abouzi et al, i.e., 14.224 ± 0.008 min 41 . However, more recent measurements have highlighted discrepancies in this value, and the measured t 1/2 of 101 Tc, which was free from 101 Mo during the measurement, was 14.02 ± 0.01 min 42 .…”

Section: Nuclear Propertiessupporting

confidence: 86%

“… Year Performed Half-life, t 1/2 (min) Detector Production route Ref. 1940 9.0 ± 1 N/A 100 Mo(n,γ) 101 Mo; 101 Mo → 101 Tc Sagane 20 1941 14.0 N/A N/A Maurer 17 1942 14.0 N/A U fission; 101 Mo → 101 Tc Hahn 19 1948 14.5 GM tube 102 Ru(γ,p) 101 Tc Perlman 38 1948 16.5 ± 0.5 GM tube 102 Ru(γ,p) 101 Tc Mock 39 1953 15.0 GM tube 101 Ru(n,p) 101 Tc Paul 68 1954 14.3 ± 0.1 GM tube 100 Mo(n,γ) 101 Mo; 101 Mo → 101 Tc Wiles 34 1957 14.0 ± 0.1 NaI 101 Mo → 101 Tc O’Kelley 32 1960 15 ± 3 Proportional counter 103 Rh(n, 3 He) 101 Tc Kumabe 40 1990 14.22 ± 0.008 HPGe 100 Mo(n,γ) 101 Mo; 101 Mo → 101 Tc Abzouzi 41 2008 14.02 ± 0.1 HPGe 100 Mo(n,γ) 101 Mo; 101 Mo → 101 Tc You 42 ...…”

Section: Nuclear Propertiesmentioning

confidence: 99%

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Discovery, nuclear properties, synthesis and applications of technetium-101

Johnstone¹,

Mayordomo

Mausolf³

2022

Commun Chem

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Technetium-101 (101Tc) has been poorly studied in comparison with other Tc isotopes, although it was first identified over ~80 years ago shortly after the discovery of the element Tc itself. Its workable half-life and array of production modes, i.e., light/heavy particle reactions, fission, fusion-evaporation, etc., allow it to be produced and isolated using an equally diverse selection of chemical separation pathways. The inherent nuclear properties of 101Tc make it important for research and applications related to radioanalytical tracer studies, as a fission signature, fusion materials, fission reactor fuels, and potentially as a radioisotope for nuclear medicine. In this review, an aggregation of the known literature concerning the chemical, nuclear, and physical properties of 101Tc and some its applications are presented. This work aims at providing an up-to-date and first-of-its-kind overview of 101Tc that could be of importance for further development of the fundamental and applied nuclear and radiochemistry of 101Tc.

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Section: Nuclear Propertiessupporting

confidence: 86%

Section: Nuclear Propertiesmentioning

confidence: 99%

Discovery, nuclear properties, synthesis and applications of technetium-101

Johnstone¹,

Mayordomo

Mausolf³

2022

Commun Chem

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“…We note that there is a 13 sigma discrepancy between the two recent most precise measurements [9,10], calling into question at least one of the quoted uncertainties. In such cases the Particle Data Group [12] recommends a procedure for scaling the uncertainty.…”

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confidence: 78%

Improved measurement of the half-life of theJπ=8−nuclear isomerEu152m2
Humby
¹
,
Simón
²
,
Beausang
³

et al. 2015
Phys. Rev. C
2
0
1
0
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The standard γ-ray energy calibration source 152 Eu is well known based on the 13.5 year decay of its ground state. However, in addition to this decay 152 Eu also has two relatively long lived isomeric states: a 9 hour J π =0 − state at E * = 46 keV and a 96 minute J π =8 − state at E * = 148 keV.Here we report a new measurement of the half-lives of both of these isomeric states. Excited states in 152 Eu were populated following the 154 Sm(p,3n) reaction using a 25 MeV proton beam from the K-150 cyclotron at the Cyclotron Institute of Texas A&M University. Post irradiation, γ rays from the de-excitation of the long lived isomeric states were measured using the six BGO shielded high purity germanium (HPGe) clover detectors that are part of the STARLiTeR array.The half-life of the J π = 8 − isomer 152m 2 Eu was obtained by measuring the decrease in intensity of the 90 keV γ ray from the cascade to the ground state. The half-life of this state was measured to be 95.8(4) minutes which is in agreement with and significantly more precise than the previously measured value of 96(1) minutes. In a manner similar to the ground state the second long lived isomer 151m 1 Eu, the J π =0 − state at 46 keV, β-decays to excited states in 152 Gd and 152 Sm. The half-life of this state was measured to be 9.39(7) hours using five γ-ray transitions.

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“…The paper published in 1990 [2] report the presently recommended 122 Sb half-life value together with the half-life of 41 Ar, 80m Br, 94m Nb, 101 Mo, 101 Tc, 109 Pd, 109m Pd, 122m Sb, 123m Sn, 152m Eu and 239 Np. The authors did not describe the experiments nor the elaboration of the collected data.…”

Section: Discussionmentioning

confidence: 99%

“…Here and hereafter uncertainties in parentheses are standard uncertainties (k = 1). A literature review revealed that the recommended t 1/2 ( 122 Sb) value is based on the most recent result of an inconsistent dataset published in 1990 [2] without reporting details on the experiment nor the uncertainty budget which are compulsory to support the claimed 10 -4 relative standard uncertainty level [3].…”

Section: Introductionmentioning

confidence: 99%

A new measurement of the 122Sb half-life

D'Agostino

Luzio

Sharp

et al. 2021

J Radioanal Nucl Chem

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Following significant discrepancies observed when decay-correcting 122Sb γ-peak count rates to a reference time, we looked at the literature supporting the presently recommended 2.7238(2) d (1σ) 122Sb half-life value as the source of these discrepancies. Investigation revealed that the value was derived from an inconsistent dataset and was published without reporting details of the experiment nor the uncertainty budget. In this work we performed a new measurement of the 122Sb half-life by measuring the 122Sb decay of neutron-activated antimony samples using state-of-the-art γ-detection systems characterized in terms of efficiency drift and random pulse pile-up. The measurement was carried out in two different laboratories with the same method. The resulting 2.69454(39) d and 2.69388(30) d (1σ) 122Sb half-life values are in agreement at the evaluated 10–4 relative combined standard uncertainty level but are significantly lower (1.07% and 1.10% lower, respectively) than the preexisting recommended value.

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Redetermination of several half-lives

Cited by 21 publications

References 28 publications

Discovery, nuclear properties, synthesis and applications of technetium-101

Discovery, nuclear properties, synthesis and applications of technetium-101

Improved measurement of the half-life of theJπ=8−nuclear isomerEu152m2
Humby
¹
,
Simón
²
,
Beausang
³

et al. 2015
Phys. Rev. C
2
0
1
0
View full text Add to dashboard Cite

A new measurement of the 122Sb half-life

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Redetermination of several half-lives

Cited by 21 publications

References 28 publications

Discovery, nuclear properties, synthesis and applications of technetium-101

Discovery, nuclear properties, synthesis and applications of technetium-101

Improved measurement of the half-life of theJπ=8−nuclear isomerEu152m2Humby1, Simón2, Beausang3 et al. 2015Phys. Rev. C2010View full textAdd to dashboardCite

A new measurement of the 122Sb half-life

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About

Improved measurement of the half-life of theJπ=8−nuclear isomerEu152m2
Humby
¹
,
Simón
²
,
Beausang
³

et al. 2015
Phys. Rev. C
2
0
1
0
View full text Add to dashboard Cite