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Am-241 in Wilson Cloud Chamber: the typically invisible ionization tracks of alpha particles emitted from a radioactive source are revealed in this miniature expansion type cloud chamber. When an americium nuclei disintegrates it ejects a high speed cluster of protons and neutrons (2 of each) called an alpha particle which then plows through the air creating a trail of ions, tearing electrons off any nearby molecules it passes by. A rapid decrease of pressure (releasing the squeeze bulb) drops the temperature in this chamber allowing cloud formation. Alcohol droplets prefer to condense on ionized molecules/atoms and so reveal the tracks. Amazingly the synthetic element americium-241 is found in common smoke detectors, where a few micrograms will emit thousands of alphas per second. Of course please use great caution if you choose to mess around with any Am-241- it’s safe inside the smoke detector, much less so if removed. ➡️ Follow the link in my profile for more information on demonstration cloud chambers and other amazing devices featured here on credits : @physicsfun
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