A neutron optical periscope used for neutron imaging
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- 作者：Burkhard Schillinger ; Peter Bö ; ni ; Christian Breunig ; Elbio Calzada ; C. Leroy ; Martin Mü ; hlbauer ; Michael Schulz
- 关键词：Neutron imaging ; Neutron radiography ; Neutron detectors ; Gamma filter ; Fast neutron filter ; Neutron periscope ; Neutron polarizer ; Bandpass
- 刊名：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
- 出版年：2009
- 出版时间：21 June 2009
- 年：2009
- 卷：605
- 期：1-2
- 页码：40-42
- 全文大小：186 K
文摘
A standard neutron guide is ill suited for neutron imaging, because reflections in the guide destroy the collimation of the neutron beam and let the cross-section of the neutron guide act as a divergent area source. Good neutron imaging installations use a flight tube instead, but with direct sight they also have a large background of gamma radiation and fast and epithermal neutrons. With the availability of high-m super mirrors, it has now become possible to build a neutron optical periscope that eliminates direct sight with two plain optical reflections only, without destroying the beam collimation ratio. At the FRM II reactor of Technische Universität München, several prototypes have been built and tested. Several neutron periscopes will be installed during the upgrade of the ANTARES neutron imaging facility in 2009/2010.