Two-dimensional detection system for neutron radiation in the field of neutron scattering spectrometry

摘要

This invention relates to a two-dimensional detection system for neutron radiation comprising a means (1) for emitting a neutron beam (10), a support means (2) adapted for receiving a sample (3), a photoemission means (5) adapted for being activated by a neutron radiation, a cooled low light level charge-coupled detection device (7). The emission means (1) emits a monochromatic neutron beam (10). The system further comprises a filter means (4), the filter means (4) being located between the support means (2) and the photoemission means (5) and being adapted for trapping at least a substantial part of the monochromatic neutron beam transmitted (12) by the sample (3), and an amplification means (6) located upstream the charge-coupled detection device (7) and coupled with the charge-coupled detection device (7).

主权项

1. Two-dimensional neutron detection system for neutron scattering comprising
(a) an emission means configured for emitting a monochromatic neutron beam, (b) a support means for receiving a sample, arranged in the trajectory of the monochromatic neutron beam; (c) a photoemission means for activation by neutrons, arranged in the trajectory of the monochromatic neutron beam after the (b) support means, wherein (c) the photoemission means comprises a lithium-based scintillator which emits alpha radiation originating from a single nuclear reaction; (d) a filter means, said filter means being located between (b) the support means and the (c) photoemission means and being adapted for trapping the entire monochromatic neutron beam transmitted by the sample such that scattered neutrons from the sample reach and activate the (c) photoemission means; and
wherein the (c) photoemission means detects only the number of neutrons scattered by the sample and is in the direct path of the (a) emission means and (d) filter means; (e) a cooled low light level charge-coupled detection device, (f) an amplification means located upstream of (e) the charge-coupled detection device and coupled with (e) the charge-coupled detection device, said (f) amplification means and said (e) charge-coupled detection device being surrounded by a shield for stopping gamma radiation; and wherein said (c) photoemission means, said (f) amplification means, and said (e) charge-coupled detection device are enclosed in a box designed such that no light radiation other than that emitted by the (c) photoemission means can penetrate inside, said (c) photoemission means forming an inlet wall of the box, and said (e) charge-coupled detection device coupled with said (f) amplification forming an outlet wall of the box, wherein the outlet wall is adjacent to the inlet wall.