1 - IAEA Nuclear Data Services

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acid have been distributed to laboratories in and outside
the European Community [34-].
A method has been developed to determine the isotopic
composition of metallic boron layers r^l, prepared
by evaporation T36]. It has been possible to define
the B concentration in different samples relative
to each other to within 0.2%. It is hoped to achieve
an accuracy of 0.25%.
Lithium
P.J. De Bièvre, G.H. Debus
Four methods used for the chemical assaying of Li
agree to within 0.02%. The preparation of purified
6
Li and
7
Li is started and blends will be prepared
during the first quarter of 1968. Different chemical
compounds of Li are under examination in the mass
spectrometry group in order to obtain stable signals.
Deuterium
T. Babeliowsky, G.H. Debus
The correlation between density, H/D ratio and 0-isotope
content of heavy water has been established;
the D~0 range covered was 99.02 - 99.82 mole %. An
international intercomparison of a reference water
samples has been continued. Results from Chalk River
were obtained, results from Sweden are awaited.
Sample Preparation and Assaying
G.H. Debus, H.L. Eschbach, K.F. Lauer, H. Moret,
G. Müschenborn, J. Van Audenhove, V. Verdingh
In 1967 a total of 114- orders, covering 2024 samples
were treated. Sample preparation and assaying started
at the CBNM in the beginning of 1963, and as a matter
of information a survey of the total activity of this
group during the last five years is given in table V.
Prom 558 orders carried out, 4-8% were covering Euratom
needs, 48.3% concerned activities in different labo-