CAFNA{sup (c)}, coded aperture imaging for fast neutron analysis: Application to contraband and explosive detection
- Department of Nuclear Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02138 (United States)
Fast neutron analysis is a technique for determination of the elemental composition of materials in bulk by detecting the energies of characteristic gamma rays, which are emitted by elements after a neutron interaction. These gamma rays are typically in the 2 to 6 MeV range and it is desired to image them with a high efficiency system. Coded aperture imaging is a technique, which can improve system sensitivity by as much as a factor of fifty as compared to conventional collimators. Such systems have been used in x-ray astronomy, but unlike x-ray astronomy, our system is designed for near field imaging. The choice of pattern is critical to the performance of the system but we have devised patterns such that the reconstruction of point like objects is clean and rapid with no spurious response. We have also used the technique for imaging of high energy radioisotopes used in nuclear medicine.
- OSTI ID:
- 21208037
- Journal Information:
- AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 475; ISSN APCPCS; ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
APERTURES
EXPLOSIVES
FAST NEUTRONS
GAMMA DETECTION
GAMMA SPECTROSCOPY
IMAGES
MEV RANGE
MULTI-ELEMENT ANALYSIS
NEUTRON BEAMS
NEUTRON REACTIONS
PHOTON EMISSION
POSITION SENSITIVE DETECTORS
QUANTITATIVE CHEMICAL ANALYSIS
RADIOISOTOPES
RESOLUTION
SCATTERING
SENSITIVITY