Monitoring of high energy neutron fields

Monitoring of High-Energy neutrons fields is primarily of interest in the context of nuclear fusion research. D-Li and spallation neutron sources are proposed as high intensity neutron sources for fusion simulated radiation damage experiments. Some neutron dosimetry experiments in such sources are executed. The main problem to analyse these experiments lies in the unknown cross-sections above 20 MeV up to 1 GeV. Only theoretical calculated cross-sections are available, tested in integral experiments. In this way some consistent cross-sections sets can be obtained, which however do not guarantee their correctness. High energy mono energetic neutrons are difficult to get, consequently a direct verification, measuring some differential neutron activation cross-section in the interested energy range is quasi impossible. Supposing that at these energies proton and neutron cross-section are nearly equal, some help may come from proton-activation cross sections. The status of neutron-cross sections for activation, helium-production and radiation damage (transmutation and dpa) is discussed and the need for further work considered