Objective To improve the neutron standards data set, relative to which partial cross-sections or other quantities, important for fission and fusion technology, are determined. To improve radionuclide decay data for standards application. To develop nuclear measurement techniques for nuclear and non-nuclear applications. Progress to end 1990. The nuclear measurements project follows two branches : nuclear data and nuclear metrology.The nuclear data sub-project is concerned with nuclear data for standards, nuclear data for fission technology and nuclear data for fusion technology. In the standards area the study of mass- and nuclear charge distributions (in particular in the cold fragmentation region) of fission fragments for the spontaneous fission of 252Cf was finalised and submitted for publication. The evaluation of X- and gamma-ray emission probabilities of 23 radionuclides for detector-efficiency calibration was finalised and is sent to IAEA for publication. In the subproject on nuclear data for fission technology the results on low-energy of 235U and the low-energy fission cross-sections and Westcott factors for the common fissile nuclides, were finalised and presented at the Physics of Reactors Conference. Evaluated files have to be adapted accordingly. For the structural materials a reanalysis of the 56Fe data with the new experimental weighting function for the gamma-ray detectors will be done; the 60Ni (n,) cross-section data are analysed up to 300 keV neutron energy, as well as the high energy transmission of 60Ni up to 500 keV. Studies of non-statistical effects in nuclear level densities continued. In the area of nuclear decay data the finalisation of the measurement of alpha-particle emission probabilities in the decay of 237Np, should be mentioned. In the area of nuclear data for fusion technology (n, alpha) double differential cross-sections were measured for several Ni and Cu isotopes in the energy range from 5 to 14 MeV neutron energy. Double differential neutron emission cross-sections were obtained for the 9Be (n, 2n)-reaction and subjected to a first analysis. The nuclear metrology subproject is concerned with radionuclide and neutron flux and dose metrology. In radionuclide metrology the study of the non-linear response of Si detectors to particle irradiation was finalised. Several sets of low-energy X-ray sources were standardised as well as an 192Ir solution. A quality control exercise of radionuclide calibrators among Belgian hospitals was done. In neutron dose metrology neutron doses were determined for irradiations at the Van de Graaff in particular for radiobiological studies. The major facilities of CBNM, the Geel linear electron accelerator GELINA and the CN 7MV Van de Graaff were fully operational and used in the neutron data programme. At the VG accelerator tests to measure the 9Be (d,n) neutron spectrum, making use of the shortest VG bursts and a 23 m long flight-path, will be finalised. Detailed description of work foreseen in 1991 (expected results). In the standards area further work on the spontaneous fission of 252Cf to study the -ray multiplicities and average -ray energy as a function of mass and energy of the fission fragments will be carried out, as well as tests on H-layers of octacosanol on Ta-backings, for H-content and homogeneity, to determine accurately the 235U(n,f)/H(n,n) cross-section ratio. For the nuclear data for fission technology, measurement and analysis of the 58Ni and 61Ni capture and transmission data will be performed. Capture gamma-ray measurements in the resonances of 53Cr will be finalised. A transmission experiment to determine the n-values of 56Fe and 52Cr will be performed. In the field of nuclear data for fusion technology, final analysis of the 9Be (n,2n) data and measurements of Pb (n,2n) double differential data will be done. Double differential (n,) cross-sections for Ni and Cu will be finalised and published. In the nuclear metrology subproject, measurements on 192Ir wires will be performed, and the evaluations of P-measurements done to terminate the contract with CIEMAT (Spain). Radionuclides will be standardised for measurements of neutron-flux monitors. Short description of evolution of work in 1992. The evolution in 1992 will be a continuation with adaptation to the specific requests of the users' communities, concentrating on the most urgent users' needs. The availability of visiting scientists and fellows should allow a full exploitation of the major facilities. Programme(s) JRC-NUMEAS 4C - Specific research programmes (Euratom) to be implemented by the Joint Research Centre - Nuclear measurements and reference materials -, 1988-1991 Topic(s) Data not available Call for proposal Data not available Funding Scheme Data not available Coordinator Joint Research Centre Geel EU contribution No data Address Steenweg op Retie 2440 GEEL Belgium See on map Total cost No data
