2023年1月15日 星期日

scientists turned to neutron tomography for answers.





Unable to open this heavily corroded, likely 12th-century pendant—but curious about what's inside—scientists turned to neutron tomography for answers.



ARSTECHNICA.COM
Neutron imaging revealed the secrets of this gold-plated medieval pendant


 neutron tomography

Neutron tomography is a form of computed tomography involving the production of three-dimensional images by the detection of the absorbance of neutrons produced by a neutron source.[1] It creates a three-dimensional image of an object by combining multiple planar images with a known separation.[2] It has a resolution of down to 25 μm.[3][4] Whilst its resolution is lower than that of X-ray tomography, it can be useful for specimens containing low contrast between the matrix and object of interest; for instance, fossils with a high carbon content, such as plants or vertebrate remains.[5]

Neutron tomography can have the unfortunate side-effect of leaving imaged samples radioactive if they contain appreciable levels of certain elements such as cobalt,[5] however in practice this neutron activation is low and short-lived such that the method is considered non-destructive.



中性子断層撮影法(ちゅうせいしだんそうさつえいほう NCT)は、非破壊検査の一種で、中性子線を検査対象に照射して内部を透過させて3次元構造を生成する撮影法[1]

概要


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