High resolution position sensitive neutron detection

The fast neutron flux from a 14 MeV neutron generator has been measured time-, position- and energy-dependent. In this paper we report especially on a method for determination of the spatial flux distribution. An evaluation procedure of neutron radiographic X-ray films has been developed: The density gradation by exposure of an X-ray film to an neutron activated metal plate (e.g. pure Al) is digitized by a television combined with a transient recorder. The density gradation curve was absolutely calibrated with activation foils fixed on the metal plate during neutron irradiation. Plates of different material have activation thresholds at different neutron energies. This results in different geometry structures on the films exposed to these metal plates. Coupling these results to fission chamber measurements/1/ leads to a Time Energy Target Radiographic Analysis (TETRA). Neutron fluence distribution curves near the tritium-target are presented. (INT)