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Journal Articles

Grain size dependence of meteoric $$^{10}$$Be concentrations in bed-sediments of Ado and Yasu rivers flowing into Lake Biwa

Fujisawa, Jumpei*; Minami, Masayo*; Kokubu, Yoko; Matsuzaki, Hiroyuki*

JAEA-Conf 2018-002, p.91 - 94, 2019/02

https://doi.org/10.11484/jaea-conf-2018-002

Beryllium-10 ($$^{10}$$Be) of a cosmogenic nuclide precipitates in forms of BeO and Be(OH)$$_{2}$$ attaching with aerosol on the Earth surface. It is accumulated on the sea- and lake-bottoms. Recently, the meteoric $$^{10}$$Be is attracting attention as a powerful tool for investigating the past climate change, because it is affected by the earth- and lorcal- cyclical changes of materials such as atmosphere and water circulation. The $$^{10}$$Be exists mostly as hydroxide at pH $$>$$5, and is easy to adhere to soil and mineral surface. Therefore, $$^{10}$$Be concentration in sediment could be influenced by its grain size composition because fine-grained sediment has a big surface area per unit mass. The purpose of this study is to reveal the relationship between $$^{10}$$Be concentrations and the grain-size of river sediments. The samples used were bottom-sediments of 18 rivers flowing into Lake Biwa, Japan. The sediments were sieved to 5 fractions and analyzed each for $$^{10}$$Be concentration by JAEA-AMS-TONO.

Oral presentation

Selection of regents for measurement of low concentrations of $$^{10}$$Be and $$^{26}$$Al by AMS

Kokubu, Yoko; Matsubara, Akihiro; Fujita, Natsuko; Nishio, Tomohiro*; Owaki, Yoshio*; Sanada, Katsuki*; Nishizawa, Akimitsu*; Miyake, Masayasu*

no journal, , 

Cosmogenic nuclides of $$^{10}$$Be and $$^{26}$$Al are used for studies such as estimation of exposure age and erosion rate of rock. In order to measure traces of $$^{10}$$Be and $$^{26}$$Al by accelerator mass spectrometry (AMS) in these studies, reagents with low levels of $$^{10}$$Be and $$^{26}$$Al are needed. In this study, ratios of $$^{10}$$Be/$$^{9}$$Be or $$^{26}$$Al/$$^{27}$$Al in several reagents were compared. The reagents were oxides for evaluation of blank in measurement and standard solutions for atomic absorption spectrometry (AAS) or inductively coupled plasma optical emission / mass spectrometry (ICP) for carrier and evaluation of process blank. The ratios were measured in JAEA-AMS-TONO. The ratios of $$^{10}$$Be/$$^{9}$$Be in the Be oxides and the Be standard solutions were approximately 10$$^{-14}$$$$sim$$10$$^{-15}$$ levels. The Be Standard solutions for AAS and ICP supplied by Merck had lower ratios of $$^{10}$$Be/$$^{9}$$Be than those supplied by Wako and Kanto chemical.

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