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Cloud Chamber Demo

The Diffusion Cloud Chamber is used to view high energy alpha particles, lower energy beta particles, and electrons produced by gamma rays interacting with gas molecules. The Chamber allows for the viewing of cosmic rays without the need for dry ice or external illumination.

About the Pb-210 Needle Source:

A needle source is used to generate a point source of radiation inside cloud chambers for demonstrating alpha and beta radiation tracks. 

The source is constructed by depositing a small quantity of radioactive isotope onto the eye of a standard sewing needle which is mounted on a test tube stopper for insertion into the cloud chamber. The needle and stopper are placed into a test tube for protection during shipping and storage.

Special Features

  • Uses ice water instead of dry ice
  • Water circulation pump
  • Built-in high voltage (~800V) power supply for clearing the chamber of unwanted ions
  • Powered by 12V DC power adapter
  • Built-in LED lamps for illuminating the particle trails

From Pasco's website

Diffusion Cloud Chamber Set up

Cloud Chamber Demo

Diffusion Cloud Chamber