Cloud Chamber / Wilson Chamber in Ueno Science Museum
The cloud chamber, also known as the Wilson chamber, is a particle detector used for detecting ionizing radiation.
File:Home Made Cloud Chamber.webm
A Home Made Cloud Chamber
Image taken in the Pic du Midi at 2877 m in a Phywe PJ45 cloud chamber (size of surface is 45 x 45 cm). This rare picture shows in a single shot the 4 particles that we can detect in a cloud chamber : proton, electron, muon (probably) and alpha
In its most basic form, a cloud chamber is a sealed environment containing a supersaturated vapor of water or alcohol. When a charged particle (for example, an alpha or beta particle) interacts with the mixture, the fluid is ionized. The resulting ions act as condensation nuclei, around which a mist will form (because the mixture is on the point of condensation). The high energies of alpha and beta particles mean that a trail is left, due to many ions being produced along the path of the charged particle. These tracks have distinctive shapes (for example, an alpha particle's track is broad and shows more evidence of deflection by collisions, while an electron's is thinner and straight). When any uniform magnetic field is applied across the cloud chamber, positively and negatively charged particles will curve in opposite directions, according to the Lorentz force law with two particles of opposite charge.
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