LXXV. The natural radioactivity of lutetium

Dixon, D.R.; McNair, A.; Curran, S.C.

doi:10.1080/14786440708520476

Cited by 41 publications

(12 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…No more than 0.9% of the total number of decays of 176 Lu can possibly belong to the ␤ ϩ decay branch. Our data confirm the findings of the early ␥-counting studies (Arnold and Sugihara, 1953;Arnold, 1954;Dixon et al, 1954;Glover and Watt, 1957) that the ␤ ϩ decay of 176 Lu is extremely slow or nonexistent, and set a more stringent upper limit on the ␤ ϩ fraction in the total decays of 176 Lu.…”

Section: Magnitude Of Branching Decay Of 176 Lusupporting

confidence: 91%

“…Flammersfeld (1947) reported a decay scheme for naturally radioactive lutetium (also known in those days as cassiopeium) in which both ␤ ϩ and ␤ Ϫ decays exist with the ratio ␤ ϩ /␤ Ϫ ϭ 2. Subsequent decay counting studies, which specifically searched for branched decay, determined much lower ratios of ␤ ϩ /␤ Ϫ ϭ 0.03 Ϯ 0.01 (Dixon et al, 1954), ␤ ϩ /␤ Ϫ Ͻ0.1 (Arnold, 1954), or did not detect ␤ ϩ decay at all (Arnold and Sugihara, 1953;1 Glover and Watt, 1957). In numerous subsequent ␥-counting studies, some of which are listed in the caption of Figure 1 and in the electronic annex Table EA -1, 176 Lu was considered a nuclide that does not experience branched decay.…”

Section: Previous Studies Of Branched Decay Of 176 Lumentioning

confidence: 97%

See 1 more Smart Citation

Geochemical test for branching decay of 176Lu

Amelin

Davis

2005

Geochimica et Cosmochimica Acta

View full text Add to dashboard Cite

Section: Magnitude Of Branching Decay Of 176 Lusupporting

confidence: 91%

Section: Previous Studies Of Branched Decay Of 176 Lumentioning

confidence: 97%

Geochemical test for branching decay of 176Lu

Amelin

Davis

2005

Geochimica et Cosmochimica Acta

View full text Add to dashboard Cite

“…5o (v) 190.36 (7) 201.84 (6) 2OV 5"" 213.50 (6} 216.00 {7) 2s6.19 (v} 239.62 (6) 264.1S (6) 315.50 (15) 346.90 (20) 350.18 (20) S58.V2 {20) 380.48 (20) 414.34 (15) 445.52 (8) 461.41 (8) 466.16 {7) 473.21 (7) 474.64 (8) 5ov. v9 (i5) 511.…”

Section: A Target and Source Preparationmentioning

confidence: 99%

Decays ofTa176,Lu
Bernthal
¹
,
Rasmussen
²
,
Hollander
³

1971
Phys. Rev. C
19
1
1
0
View full text Add to dashboard Cite

The locations of 48 energy levels ln Hf have been deduced from p-ray singles, conversion-electron, and y-p coincidence measurements on the Ec-P decay of Ta. Over 300 pray transitions have been observed in the~Ta decay spectrum, and about 140 of these have been definitely assigned to the 7 Hf level scheme on the basis of 75 y-y coincidence spectra. Spin and parity assignments are proposed for 27 levels besides the ground-state rotationalband members. Less extensive y-ray singles data from Lu and Lu decay have also been obtained; these are found to be consistent with the 7 Hf level structure proposed on the basis of Ta decay data. Two 0+ excitations in 8Hf identified at 1150 and 1293 keV are found to display quite different decay properties. Evidence for the existence of a series of low-spin four-quasiparticle states near 3 MeV is cited. The Hf level structure is compared with available theoretical calculations, and a preliminary interpretati. on of several unusual features of the level scheme is presented.Counting was usually begun within three hours after the end of irradiation. Relatively small quantities of '"Ta, '"Ta, and "8Ta contamination were noted in the y-ray spectra.

show abstract

“…The existence of a minor (Յ4%) decay branch of 176 Lu to 176 Yb by electron capture has been debated (27,28). If it does exist, it can only contribute a maximum bias of 0.18% between counting experiment and agecomparison results (29).…”

mentioning

confidence: 99%

Calibration of the Lutetium-Hafnium Clock

Scherer

Münker

Mezger

2001

Science

2,313

671

View full text Add to dashboard Cite

Well-defined constants of radioactive decay are the cornerstone of geochronology and the use of radiogenic isotopes to constrain the time scales and mechanisms of planetary differentiation. Four new determinations of the lutetium-176 decay constant (lambda176Lu) made by calibration against the uranium-lead decay schemes yield a mean value of 1.865 +/- 0.015 x 10(-11) year(-1), in agreement with the two most recent decay-counting experiments. Lutetium-hafnium ages that are based on the previously used lambda176Lu of 1.93 x 10(-11) to 1.94 x 10(-11) year(-1) are thus approximately 4% too young, and the initial hafnium isotope compositions of some of Earth's oldest minerals and rocks become less radiogenic relative to bulk undifferentiated Earth when calculated using the new decay constant. The existence of strongly unradiogenic hafnium in Early Archean and Hadean zircons implies that enriched crustal reservoirs existed on Earth by 4.3 billion years ago and persisted for 200 million years or more. Hence, current models of early terrestrial differentiation need revision.

show abstract

LXXV. The natural radioactivity of lutetium

Cited by 41 publications

References 15 publications

Geochemical test for branching decay of 176Lu

Geochemical test for branching decay of 176Lu

Decays ofTa176,Lu
Bernthal
¹
,
Rasmussen
²
,
Hollander
³

1971
Phys. Rev. C
19
1
1
0
View full text Add to dashboard Cite

Calibration of the Lutetium-Hafnium Clock

Contact Info

Product

Resources

About

LXXV. The natural radioactivity of lutetium

Cited by 41 publications

References 15 publications

Geochemical test for branching decay of 176Lu

Geochemical test for branching decay of 176Lu

Decays ofTa176,LuBernthal1, Rasmussen2, Hollander3 1971Phys. Rev. C19110View full textAdd to dashboardCite

Calibration of the Lutetium-Hafnium Clock

Contact Info

Product

Resources

About

Decays ofTa176,Lu
Bernthal
¹
,
Rasmussen
²
,
Hollander
³

1971
Phys. Rev. C
19
1
1
0
View full text Add to dashboard Cite