A cloud chamber, also known as a Wilson chamber, is a particle detector used for visualizing the passage of ionizing radiation.
The original cloud chamber of C. T. R. Wilson at the Cavendish Lab, Cambridge, England.
Fig. 4: How condensation trails are formed in a diffusion cloud chamber.
Fig. 5: In a diffusion cloud chamber, a 5.3 MeV alpha-particle track from a Pb-210 pin source near Point (1) undergoes Rutherford scattering near Point (2), deflecting by angle theta of about 30 degrees. It scatters once again near Point (3), and finally comes to rest in the gas. The target nucleus in the chamber gas could have been a nitrogen, oxygen, carbon, or hydrogen nucleus. It received enough kinetic energy in the elastic collision to cause a short visible recoiling track near Point (2). (The scale is in centimeters.)
Example of watercooled thermoelectric cloud chamber
Charles Thomson Rees Wilson was a British meteorologist and physicist who shared the 1927 Nobel Prize in Physics with Arthur Compton for his invention of the cloud chamber.
Cloud chamber
…particle track is wispy and shows more evidence of deflections by collisions. Cloud chambers were invented in the early 1900s by the Scottish physicist Charles Thomson Rees Wilson. He played a prominent role in experimental particle physics from the 1920s to the 1950s, until the advent of the bubble chamber. In particular, the…
Commemorative plaque at Ben Nevis about the observatory there, and Wilson's cloud chamber.
Commemorative plaque at Flotterstone