Alpha Particles' condensation trails, and a walk in the London fog?

Factual Questions
1

…That’s about as descriptive a thread title as I could think up. Sorry.

Anyway, Cecil’s recent column, Are camp lanterns radioactive? mentioned that if you pop a thorium lamp mantle into “kitchen-table cloud chamber (using dry ice and alcohol),” you could/can see the condensation trails left by the Alpha particles.

My question is twofold…

  1. Are there any photographs (movies, even?) online of what this looks like, to a human observer?

And…

  1. Are there any meteorological conditions, in nature, where you could see this happening? Like if I went for a walk one misty evening, carrying my handy Alpha Particle Emitter on my shoulder?

Well, thanks for your time…
Ranchoth

2

Here is a not terribly enlightening picture, with a QuickTime movie that apparently shows it better.

3

Thanks for the link, raygirvan. Wild stuff, eh?