Open AccessPinhole for producing a close-in image of an extended 14-MeV neutron source
Author(s) -
Stephen M. Matthews
Publication year - 1975
Language(s) - English
Resource type - Reports
DOI - 10.2172/4121257
Subject(s) - neutron , pinhole (optics) , neutron source , spallation neutron source , optics , physics , pinhole camera , neutron time of flight scattering , point source , neutron imaging , image plane , plane (geometry) , neutron temperature , nuclear physics , neutron cross section , image (mathematics) , computer science , geometry , mathematics , artificial intelligence
In pulsed-neutron pinhole imaging experiments, it is desirable to produce images of extended 14-MeV neutron sources close to the source itself to minimize time-of-flight distortions. ''Close'' means that the thickness of the pinhole barrier is not negligible in comparison with the distance from the source to the image plane. A pinhole assembly capable of producing close-in images extended 14-MeV neutron sources was designed and used in a number of experiments. A computer program was devised to predict the performance of the pinhole by calculating the distribution of neutrons incident on the image plane from a neutron point source in the source plane. The calculation of the image-plane neutron distribution takes into account edge penetration through the barrier and is a function both of the neutron mean free path in the barrier material and of the system geometry. (auth