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Neutron scanner

From EverybodyWiki Bios & Wiki

The Fast Neutron Gamma-Ray Radiography (FNGR) air-cargo scanner was developed by CSIRO and trialled in Brisbane International Airport in 2005–2006.[1] It used neutron and gamma-ray radiography to perform fast non-intrusive scans of cargo containers that are capable of detecting more than X-ray scanners are.[2] X-ray scanning of air freight can detect metallic items such as firearms, but has problems with other substances, whereas fast neutron radiography can analyse element composition of scanned substances.[2]

An upgraded version of the scanner, named the AC6015XN Air Cargo Scanner and co-developed by Nuctech and CSIRO, was then developed and trialled in Bejing in 2009.[3]

The Brisbane scanner used neutron generators and a gamma-ray source to produce collimated beams, with cargo containers passing on a chain conveyor belt through a tunnel, and scintillator neutron detectors and gamma ray detectors mounted in columns on the opposite side of the tunnel.[4] Containers would take approximately 2 minutes to pass through the device.[4]

By measuring the ratios of neutron beam attenuation to gamma ray attenuation, it was possible to determine what class of material the two beams were passing through.[4]

The radiation dosage from the neutron radiation was approximately 8 microsieverts (800 μrem) and was well below the limits set on food irradiation in countries such as the United Kingdom and the United States of America.[5]

The AC6015XN had a smaller footprint, different shielding, stereoscopic dual X-ray beams (produced by a LINAC) instead of the gamma-ray beams, and Nuctech's X-ray detectors across both the side and the top of the tunnel.[6] Because of the use of X-rays instead of gamma-rays, the ratio of the beam attenuations had to be corrected to account for beam hardening.[6]

Cross-reference[edit]

Sources[edit]

  • Sowerby, B.D.; Cutmore, N.G.; Liu, Y.; Peng, H.; Tickner, J.R.; Xie, Y.; Zong, C. (8 May 2009). "Recent Developments in Fast Neutron Radiography for the Interrogation of Air Cargo Containers". IAEA Conference. Vienna.

Further reading[edit]

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