Knipp Alpha Ray Track Device
Aka: Expansion Cloud Chamber
Made by Cenco around 65+ years ago, this cloud chamber displays alpha particle tracks without the use of dry ice, alcohol, or a high voltage potential. It was designed by C. T. Knipp in 1927 and uses a small Radium source to supply the Alpha particles.
To operate, its filled with water to about 4mm below the Radium source. Once done, the lid (chamber viewport) is secured in place and the illuminator activated. The bulb is squeezed so the water level barely covers the Radium source. The bulb is quickly released which allows the alpha tracks to become visible. Unlike the alcohol/dry ice type, tracks are not a continuous visual flow. They are only shown for a brief time when the bulb is released.
“The expansion of the airspace incident to releasing the bulb causes the tracks of the alpha particles to become visible as a result of the condensation of moisture upon the ions produced by the alpha particles.”
To refine definition of the tracks, a potential of 100-200 volts is placed between the water level and the top of the chamber. I have found 175-200 provides the best results.
Негізгі бет Wilson Cloud Chamber NO DRY ICE or COLD TEMPS REQUIRED
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