Sub-epsilon natural 234U/238U measurements refine the 234U half-life and U-Th geochronology

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F25%3A10505720" target="_blank" >RIV/00216208:11310/25:10505720 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=bm.TnubklT" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=bm.TnubklT</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1126/sciadv.adu8117" target="_blank" >10.1126/sciadv.adu8117</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Sub-epsilon natural 234U/238U measurements refine the 234U half-life and U-Th geochronology

Popis výsledku v původním jazyce

(234)U/(238)U ratios are used across various fields in Earth science, but their measurement is highly challenging due to the four orders of magnitude difference in isotope abundance between (234)U and (238)U. Here, we develop refined techniques for accurately and precisely measuring (234)U/(238)U using multicollector inductively coupled plasma mass spectrometry, providing a reproducibility of +/- 0.08 per mil (2σ). At this sub-epsilon precision level, the half-life of (234)U is refined to 245,670 +/- 260 years. For U-Th geochronology, systematic uncertainties from decay constants largely cancel, effectively reducing the uncertainty in the (234)U half-life to similar to +/- 25 years. This improved measurement precision consequently reduces total 2σ age uncertainties to +/- 3 thousand years (kyr) at similar to 600 thousand years ago (ka) and +/- 6 kyr at similar to 700 ka, a substantial improvement over earlier methods with uncertainties of tens of thousands of years.

Název v anglickém jazyce

Sub-epsilon natural 234U/238U measurements refine the 234U half-life and U-Th geochronology

Popis výsledku anglicky

(234)U/(238)U ratios are used across various fields in Earth science, but their measurement is highly challenging due to the four orders of magnitude difference in isotope abundance between (234)U and (238)U. Here, we develop refined techniques for accurately and precisely measuring (234)U/(238)U using multicollector inductively coupled plasma mass spectrometry, providing a reproducibility of +/- 0.08 per mil (2σ). At this sub-epsilon precision level, the half-life of (234)U is refined to 245,670 +/- 260 years. For U-Th geochronology, systematic uncertainties from decay constants largely cancel, effectively reducing the uncertainty in the (234)U half-life to similar to +/- 25 years. This improved measurement precision consequently reduces total 2σ age uncertainties to +/- 3 thousand years (kyr) at similar to 600 thousand years ago (ka) and +/- 6 kyr at similar to 700 ka, a substantial improvement over earlier methods with uncertainties of tens of thousands of years.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Science Advances

ISSN

2375-2548

e-ISSN

2375-2548

Svazek periodika

11

Číslo periodika v rámci svazku

40

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

9

Strana od-do

eadu8117

Kód UT WoS článku

001586102600032

EID výsledku v databázi Scopus

2-s2.0-105017666470