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Abstract

This report covers CBNM's activities during the first year of the multi-annual programme 1988-1991. It reflects a major change in the role and orientation of the JRC. The activities of the JRC are now only in part funded as a Specific Programme, the rest of the funding coming from other sources. The main task of CBNM under the European Communities Framework Programme is defined as the programme "Nuclear Measurements and Reference Materials". The average energy (0.39 MeV) and the relative proportion of scission neutrons (1.1% of total prompt neutrons) during spontaneous fission of 252Cf were deduced. A redetermination of the number of fission neutrons emitted per neutron absorbed for 235U low energy fission has been performed. The excitation functions of structure material constituents (moly-bdenum, chromium, nickel) has been measured. Results have been reported on the verification of UO(2) pellets reference materials (RMs) for chemical analysis, characterisation of uranium isotope RMs by mass spectrometry and progress made in preparing plutonium isotope RMs for gamma-ray spectrometry. For aerosol and surface RMs, the variation of elemental mass deposited on different types of filters has been studied, instrumentation for PIXE analysis has been improved and arsenic implants in silicon characterised by RBS.

Additional information

Authors: HANSEN H H (EDITORS), JRC Geel (BE)
Bibliographic Reference: EUR 12267 EN (1989) free of charge
Availability: Available from Joint Research Centre, Public Relations Office, I-21020 Ispra (Va.) (IT)
Record Number: 198910941 / Last updated on: 1994-12-01
Category: PUBLICATION
Original language: en
Available languages: en