I had the best day yesterday at the Rutherford Appleton Laboratory.
I went to visit David Edge and Alan Williams of @wallacemuseum where they were performing neutron imaging tests on the helm of the Black Prince which usually resides in Canterbury cathedral. The helmet consists of three plates and as neutron imaging is a non destructive form of metallurgical analysis, each of the plates were analysed to ascertain their composition. As I understand it protons are fired through a vacuum tunnel and hit a tungsten target. (In the video I am standing atop the tunnel which is entombed within giant concrete blocks) This scatters neutrons that travel to each of the satellite stations where they pass through and occasionally ricocheted off the object. This movement is measured and that data tells you what you have. It's magical -magical science.