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Diffusion Cloud Chamber
Purpose:To observe the tracks left in the chamber from a radioactive source or cosmic rays.
1. Adjust the chamber liner, so it touches the bottom of the chamber and all LEDs are visible. Pour 30-40mL of isopropyl alcohol 91% or higher purity into the chamber. Use pipette to wet the wall liner. After the liner is saturated, there should still be about 2 mm of alcohol on the bottom of the chamber. It will start working faster, if you do this 15 min. before next step.
2. Place the circulation pump on the bottom of a bucket and affix the drain hose to the bucket wall. Add just enough water to cover the pump inlet. Shake the pump up and down in the water to expel air from the impeller. Fill the bucket with ice (1kg per hour of operation). Connect the pump to AC power. If water does not start flowing, you may need to re-prime the pump by sucking on the drain hose.3. Place the source rod with stopper into the hole in the viewing window. Adjust the rod up or down so that the position of the needle's eye is about 1.5 to 2 cm above the surface of the alcohol.
4. Connect the power supply to the cloud chamber.After 5 to 10 minutes, particle tracks should become visible. Sources for both alpha and beta particles are available. If used without source cosmic ray tracks can be observed. Camera mounted above the chamber is used to display it on the screen.
!! It is very important to unplug the chamber power supply when finished!!To prevent water from freezing and damaging the heat exchanger, leave circulation pump on.
Use 210Po source. It gives better tracks.
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