Selection of regents for measurement of low concentrations of Be and Al by AMS

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

Cosmogenic nuclides of Be and Al are used for studies such as estimation of exposure age and erosion rate of rock. In order to measure traces of Be and Al by accelerator mass spectrometry (AMS) in these studies, reagents with low levels of Be and Al are needed. In this study, ratios of Be/Be or Al/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 Be/Be in the Be oxides and the Be standard solutions were approximately 1010 levels. The Be Standard solutions for AAS and ICP supplied by Merck had lower ratios of Be/Be than those supplied by Wako and Kanto chemical.