|1930 - meetup|
|1900 BRMCW - vyuka telegrafie 2000 TalkNight|
Sensitive detector of radiation (mainly beta and gamma).
FAG, the block of plastic used as scintillator, it's surface contained some unevenness from cutting process.
The goal of polishing is to make the surface flat and transparent. Abrasion was made by sanding and then polishing paste. All abrasion was made with water due to cooling. But some overheating was not avoided and minor fractures occured.
Polished FAG glows nice in UV radiation, red LASER added for effect.
Polished FAG was wrapped into aluminium foil (2 layers) and black plastic plastic (2 lyers) using black sellotape. On the top remains a hole for photomultiplier.
Finished scintillator with shielding was put into prepared frame. Frame is made from threaded rod and plastic part printed on RepRap.
Photomultiplier is attached to the scintillation plastic by some kind of very viscous silicone oil in order to keep good optical contact. Bitumen was put betwen the frame and photomultiplier, it keeps the photomultiplier in place and stops any light from outside. Last step was imbed covering tube for photomultiplier, this was made from metal drain pipe. Final step is attaching electronic interface and top cover. All wraped in black sellotape.