Neutron imaging systems and methods
Provided herein are neutron imaging systems (e.g., radiography and tomography) systems and methods that provide, for example, high-quality, high throughput 2D and 3D fast or thermal neutron and/or X-ray images. Such systems and methods find use for the commercial-scale imaging of industrial components. In certain embodiments, provided herein are system comprising a plurality of independent neutron absorber-lined collimators (e.g., 4 or more collimators) extending outwards from a central neutron source assembly.
1. A neutron imaging system comprising:
a) a central neutron source assembly configured to produce source neutrons, wherein said central neutron source comprises a solid or gas target,
b) a moderator assembly surrounding the central neutron source assembly,
c) a plurality of independent neutron absorber-lined collimators extending outwards from said central neutron source assembly, wherein each of said independent neutron absorber-lined collimators is configured to collect a portion of said source neutrons and produce a thermal neutron imaging beam line; wherein said plurality of independent neutron absorber-lined collimators comprises at least three independent neutron absorber-lined collimators; and
d) a neutron imaging detector, wherein said neutron imaging detector comprises a detector medium and an imaging plane.
2. The system of claim 1 , wherein said central neutron source assembly comprises a linear particle accelerator or a cyclotron for generating neutrons from said solid or gas target.
3. The system of claim 1 , wherein said moderator assembly surrounds at least part of said solid or gas target, wherein said moderator assembly is configured to increase neutron to gamma ratios at the exit of the collimators.
4. The system of claim 1 , further comprising: e) a robotic motion component to allow for multi-image acquisition sequences to generate 3-dimensional tomographic image data sets.
5. The system of claim 1 , further comprising: e) neutron focusing and/or reflecting elements which are configured to increase neutron flux at the imaging plane.
6. The system of claim 1 , wherein the detector medium comprises: i) film, ii) a scintillating conversion mechanism, or a digital neutron imaging detector.
7. The system of claim 1 , wherein said plurality of independent neutron absorber-lined collimators comprises at least nine independent neutron absorber-lined collimators.
8. The system of claim 1 , wherein said plurality of independent neutron absorber-lined collimators are all in a plane that is the same.
9. The system of claim 1 , wherein said plurality of independent neutron absorber-lined collimators are all in planes that are not the same.
10. The system of claim 1 , further comprising: e) at least one fast neutron collimator.
11. A method of neutron imaging of an object comprising:
a) positioning an object in front of a neutron imaging detector, and
b) generating a thermal neutron imaging beam with the system of claim 1 , such that said thermal neutron imaging beam passes through at least a portion of said object thereby generating a neutron image that is collected by said neutron imaging detector.
12. The method of claim 11 , wherein said object is an airplane part, airplane engine, munition, a product that utilizes energetic materials, a fuse, rocket, a chemically activated device, a spacecraft part, a wind turbine component, or an aerospace part.
13. The method of claim 11 , further comprising a step prior to step a) of moving said system of claim 1 at least 1 mile from a first location to a second location.
14. The method of claim 13 , wherein said first location is a storage facility and said second location is a manufacturing or maintenance facility.
15. The system of claim 1 , wherein each of the plurality of independent neutron absorber-lined collimators is conical.
16. The system of claim 1 , wherein a length-to-diameter ratio of each of the plurality of the independent neutron absorber-lined collimators is 70.
17. A neutron imaging system comprising:
a) a central neutron source assembly configured to produce source neutrons, wherein said central neutron source comprises a solid or gas target,
b) a moderator/multiplier assembly,
c) at least three thermal neutron collimators that extend outward from the moderator/multiplier assembly, wherein each of said thermal neutron collimators is configured to collect a portion of said source neutrons and produce a thermal neutron imaging beam line,
d) one or more fast neutron guides that extend outward from said moderator/multiplier assembly configured to collect a portion of said source neutrons and produce a fast neutron imaging beam line;
e) a neutron imaging detector, wherein said neutron imaging detector comprises a detector medium and an imaging plane; and
f) a fast neutron detector.
18. The system of claim 17 , further comprising an automated object movement system configured to: i) insert and remove objects to be imaged, ii) and/or imaging media, wherein automated object movement system is further configured to allow these items to be exchanged without exposing humans to an irradiation area.
19. A neutron imaging system comprising:
a) a central neutron source assembly,
b) a moderator/multiplier assembly,
c) at least three thermal neutron collimators that extend outward from the moderator/multiplier assembly,
d) one or more fast neutron guides that extend outward from said moderator/multiplier assembly;
e) a neutron imaging detector, wherein said neutron imaging detector comprises a detector medium and an imaging plane, and
f) a fast neutron detector.
20. The system of claim 19 , wherein said fast neutron detector comprises a scintillator.