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Abstract

Aluminium-cobalt alloys are required for the determination of thermal neutron fluence rates using the activation 59 degrees Celsius (n,y) 60 degrees Celsius and the subsequent decay to 60Ni with the cobalt diluted in an aluminium matrix in order to reduce neutron self-shielding effects. The main requirement of the reference materials is that the cobalt mass fraction should be well defined and that each alloy should be of homogeneous composition. Three Al-Co alloys have been prepared and certified for their cobalt mass fractions by nine laboratories using seven different methods. The three reference materials are available as foil of 0.1 mm thickness (100 cm2 units), and wire of 0.5 or 1.0 mm diameter (1 m units). The certified values are:
IRMM-527R (Al-0.1 % Co) (1.001 ± 0.024) g.kg-1
IRMM-528R (Al-1.0% Co) (10.02 ± 0.23) g.kg-1
IRMM-532 (Al-0.01%Co) (0.1000 ± 0.0025) g.kg-1

Where uncertainties are expanded uncertainties with coverage factor k = 2, corresponding to a level of confidence of about 95 %. 5 %.

Additional information

Authors: INGELBRECHT C, European Commission, Joint Research Centre, Institute for Reference Materials and Measurements, Geel (BE);DERBYSHIRE M, European Commission, Joint Research Centre, Institute for Reference Materials and Measurements, Geel (BE)
Bibliographic Reference: EUR 19931 EN (2001), pp.13. Free of charge
Availability: Available from European Commission, JRC Knowledge Management Unit, Ispra (IT) Tel: +39 033278 9843 or +39 033278 9864 Fax: +39 033278 9623 E-mail: jrc-publications-office@ec.europa.eu
Record Number: 200214284 / Last updated on: 2002-01-23
Category: PUBLICATION
Original language: en
Available languages: en
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