Radial fast-neutron fluence gradients during rotating Ar-40/Ar-39 sample irradiation recorded with metallic fluence monitors and geological age standards

Kód výsledku v IS VaVaI

RIV/26722445:_____/15:#0001062 - isvavai.cz

Výsledek na webu

http://dx.doi.org/10.1002/2014GC005611

DOI - Digital Object Identifier

10.1002/2014GC005611

Jazyk výsledku

angličtina

Název v původním jazyce

Radial fast-neutron fluence gradients during rotating Ar-40/Ar-39 sample irradiation recorded with metallic fluence monitors and geological age standards

Popis výsledku v původním jazyce

Characterizing the neutron-irradiation parameter J is one of the major uncertainties in Ar-40/Ar-39 dating. The associated uncertainty of the individual J-value for a sample of unknown age depends on the accuracy of the age of the geological standards, the fast-neutron fluence distribution in the reactor, and the distances between standards and samples during irradiation. While it is generally assumed that rotating irradiation evens out radial neutron fluence gradients, we observed axial and radial variations of the J-values in sample irradiations in the rotating channels of two reactors. To quantify them, we included three-dimensionally distributed metallic fast (Ni) and thermal-(Co) neutron fluence monitors in three irradiations and geological age standards in three more. Two irradiations were carried out under Cd shielding in the FRG1 reactor in Geesthacht, Germany, and four without Cd shielding in the LVR-15 reactor in Rez, Czech Republic. The Ni-58(nf,p)Co-58 activation reaction a

Název v anglickém jazyce

Radial fast-neutron fluence gradients during rotating Ar-40/Ar-39 sample irradiation recorded with metallic fluence monitors and geological age standards

Popis výsledku anglicky

Characterizing the neutron-irradiation parameter J is one of the major uncertainties in Ar-40/Ar-39 dating. The associated uncertainty of the individual J-value for a sample of unknown age depends on the accuracy of the age of the geological standards, the fast-neutron fluence distribution in the reactor, and the distances between standards and samples during irradiation. While it is generally assumed that rotating irradiation evens out radial neutron fluence gradients, we observed axial and radial variations of the J-values in sample irradiations in the rotating channels of two reactors. To quantify them, we included three-dimensionally distributed metallic fast (Ni) and thermal-(Co) neutron fluence monitors in three irradiations and geological age standards in three more. Two irradiations were carried out under Cd shielding in the FRG1 reactor in Geesthacht, Germany, and four without Cd shielding in the LVR-15 reactor in Rez, Czech Republic. The Ni-58(nf,p)Co-58 activation reaction a

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

JF - Jaderná energetika

OECD FORD obor

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Projekt

LM2010015: Reaktory Řež - Experimentální jaderné reaktory LVR-15 a LR-0

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2015

Kód důvěrnosti údajů

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

Název periodika

Geochemistry Geophysics Geosystems

ISSN

1525-2027

e-ISSN

—

Svazek periodika

16

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

10

Strana od-do

336-345

Kód UT WoS článku

000349839000019

EID výsledku v databázi Scopus

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