let me briefly introduce myself, I'm a highschool student from Indonesia, I'm currently making a cloud chamber for my science fair project, I did what the videos on youtube told me, but for some reason my cloud chamber won't work. Here are some pictures of my setup

So, I glued felt on top of my aquarium and soaked it with alcohol (95%), put about 4 kg of dry ice under my metal tray (baking tray) and I let the alcohol and dry ice do their job for about 15 minutes, it only showed some particles raining but I didn't see any tracks of muons. I used one bright flashlight ( about 8000 Lumens ) and the room was dark enough that I couldn't see my hand. I also covered the aquarium glass with black cloth to maximize the darkness. Can anyone help check what did i do wrong? ( and what kind of camera setup should I use to record the muons tracks? ) my cloud chamber setup

  • 2
    $\begingroup$ Related - What's wrong with my cloud chamber setup? $\endgroup$
    – Farcher
    Commented Feb 10, 2019 at 13:47
  • $\begingroup$ It is difficult to see muons, as most of the traces are close to vertical. It is easier to test with a small alpha source. A safe source for that would be a needle with polonium-210. $\endgroup$
    – user137289
    Commented Feb 10, 2019 at 14:11
  • $\begingroup$ see this from CERN indico.cern.ch/event/508576/contributions/2322575/attachments/… . . $\endgroup$
    – anna v
    Commented Feb 10, 2019 at 14:20
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    $\begingroup$ I did what the videos on youtube told me Please link to the videos. Otherwise we're just guessing what sources of information you were following. $\endgroup$
    – user4552
    Commented Feb 10, 2019 at 16:57
  • 1
    $\begingroup$ Possible duplicate of What’s wrong with my cloud chamber setup? $\endgroup$
    – Jon Custer
    Commented May 13, 2019 at 15:00

1 Answer 1


The type of light one uses seems to make a difference. When using a linear LED source, I saw nothing (not even the "snow"). Then I switched to an old-style (filament bulb) flashlight, I saw the "snow" AND a few tracks. Using a point-source LED (3rd attempt) saw nothing (again). All other parameters (chamber, temperature, source) were the same. When I changed back to the filament bulb, I saw the "snow" and a nice long track.


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