Expansion-Type Wilson Cloud Chamber, Radioactive Sources Not Included
$470.00(Ex GST)
- Expansion-type Wilson cloud chamber method
- Alcohol pad vapour supersaturation setup
- Partial vacuum via pump for expansion
- Alpha pin source creates visible tracks
- Light source required, sources not included
- Description
Description
Wilson’s Cloud Chamber (Expansion Type) is a classic apparatus for visualising ionising particle tracks using alcohol vapour supersaturation. Alcohol saturates a pad inside the chamber, then a partial vacuum is created using a vacuum pump, commonly a reversed tyre pump, to rapidly expand the air and supersaturate it with alcohol vapour. This produces conditions where vapour readily condenses on ionised paths.
When an alpha pin source is placed in the chamber, emitted particles ionise air molecules along their travel path. The alcohol vapour condenses on these ionised trails, forming fine, fog-like tracks that make the alpha particle paths visible inside the chamber. A suitable light source, such as a microscope lamp, is required to illuminate the chamber so the tracks can be clearly seen.
Important use note: This expansion-type cloud chamber is supplied without radioactive sources. A separate alpha pin source is required to produce particle tracks.
FAQs
Q: What does a Wilson cloud chamber show?
A: It shows visible condensation tracks formed when alcohol vapour condenses along ionised particle paths.
Q: How is supersaturation created in this expansion-type chamber?
A: By drawing a partial vacuum with a vacuum pump and allowing rapid expansion to supersaturate air with alcohol vapour.
Q: What produces the tracks in the chamber?
A: Alpha particles from a pin source ionise air along their path, and alcohol vapour condenses on those ionised trails.
Q: What else is required for operation?
A: A light source to illuminate the chamber, and a separate alpha pin source, as sources are not included.
Q: Are the tracks the actual path of the particles?
A: The visible tracks are condensation along ionised paths created by the particles, indicating their travel path through the vapour.
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