Diffusion Cloud Chamber (15 cm diameter) - SE-7943



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.

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


  • Cloud Chamber
  • 12 VDC Power Adapter (6 A)
  • Water Circulation Pump
  • 2 Rubber Hoses
  • Extraction Pipette
  • Source Holder and Stopper
  • High Voltage Connection Cable
  • SpecTech™ Coupon for Pb-210 Source Needle
  • How It Works

    The bottom of the chamber is cooled by circulating ice water through the base and further cooling it to -35°C with a Peltier device. Alcohol placed in the chamber wicks up inside the chamber lining where it evaporates in the warmer region of the chamber and diffuses downward. The alcohol vapor is then cooled near the chamber bottom and becomes super saturated.

    As energetic alpha and beta particles from a radioactive source pass through the alcohol vapor, the vapor condenses, forming droplets that appear as tracks in the strong chamber cross-lighting.

    Buying Guide

    Pb-210 Source Needle
    Replacement Parts
    Pb-210 Source Needle   SE-7945