Preparation of ASTER in-house 10Be/9Be standard solutions

Since its commissioning in 2006, the commercially available certificated National Institute of Standards and Technology standard reference material NIST SRM 4325 is used at the French national facility ASTER (CEREGE, Aix-en-Provence) to normalize Be-10 measurements. This standard solution being no longer disposable, we thus decided to produce in-house standards. As a first attempt, a STD-12 standard (Be-10/Be-9 = (4.939 +/- 0.053) x 10(-12)) has been prepared from 2.5 kg of marine sediments with an adapted chemical protocol. Then, a Be-10 enriched solution of known concentration being available, a STD-11 standard (Be-10/Be-9 = (1.191 +/- 0.013) x 10(-11)) that will be used at ASTER in the near future to calibrate Be-10 measurements and its dilution to the 10(-14) level (STD-14 (Be-10/Be-9 = (5.468 +/- 0.064) x 10(-14))) have been prepared from it. (C) 2015 Elsevier B.V. All rights reserved.