Abstract
CBNM's nuclear target preparation activity is conceived as a public service towards neutron physicists not only from CBNM, but also from universities, nuclear centres, industry, etc. Besides classical techniques such as electrospraying, spray painting and electrolysis, high-quality actinide deposits are prepared by vacuum deposition of actinide fluorides. These evaporate at approximately 1000 ° C lower temperatures than oxides do. The possibility of preparing actinide deposits is, however, dependent on the preparation of high-quality actinide fluoride powders without water residue. This technique is used to prepare targets for cross section measurements, for fission fragment studies and also for targets used as fission foils. In this case high-accuracy characterisation is obtained by low-geometry α-counting and isotope dilution mass spectrometry (IDMS). Similar techniques were also used to prepare certified reference deposits of 6LiF and B for absolute neutron flux measurements. Finally, it must be mentioned that many deposit requests are carried out on thin foils. Therefore, important development work was carried out to prepare very thin (< 25 μg cm −2) polyimide foils.
Published Version
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