A directional spectrometer that uses a superheated emulsion of dichlorotetrafluoroethane at the centre of a 30 cm diameter moderating-sphere of nylon-6. The system has a telescope-design wherein the detector views a narrow solid angle of about 1/6 steradians. The hydrogenous sphere effectively attenuates laterally incident neutrons, thus providing a strong angular dependence of the response. The central detector is sequentially operated at seven temperatures between 25°C and 55°C in order to generate a matrix of nested response functions suitable for few-channel spectrometry. The response matrix of the system has been determined by calibrations with monoenergetic neutrons and by Monte Carlo neutron transport calculations. The double-differential unfolding method developed for this system applies the principle of maximum entropy and allows for the rigorous use of all a priori information. The spectrometer is intended for use in the mixed neutron/photon fields encountered in the nuclear power industry, being suitable for spatially distributed radiation sources with maximum neutron energies up to 10 MeV.
|Autori interni:||D'ERRICO, FRANCESCO|
|Autori:||D'ERRICO F; GIUSTI V; REGINATTO M; WIEGEL B|
|Titolo:||A telescope-design directional neutron spectrometer|
|Anno del prodotto:||2004|
|Digital Object Identifier (DOI):||10.1093/rpd/nch278|
|Appare nelle tipologie:||1.1 Articolo in rivista|