In an earlier video, I tried to visualize
alpha particles in supercritical CO2, similar to an isopropanol vapor cloud
chamber. Someone commented that the
alpha particles will not travel very far (maybe 10 microns) in liquid or
supercritical CO2, and recommended that I try beta particles, which should have
a path length of almost 10mm.
Unfortunately, I still don't see any bubble or
droplet trails using strontium-90 and thallium-204 sources. It's possible that
the ionizing effect of the radiation particles does not interact with the CO2
phase change as it does by condensing droplets in a cloud chamber. Also, cloud
chambers are very finicky, and if this CO2 visualization method is as finicky
or worse, it may take some more time to figure out the right combination of
environmental variables.
hey everyone here's
a follow-up to the
video that I made where I said I
couldn't use supercritical co2 to help
visualize ionizing radiation originally
I used an Emery seeum source out of a
smoke detector which is an alpha emitter
and someone very helpfully pointed out
on my blog that alpha particles are very
big and slow-moving and the the path
length in a fluid as dense as
supercritical co2 is really not going to
be that long so in other words as the
alpha particle is emitted from the
radiation source it's really only going
to travel 10 microns before being
effectively stopped by the fluid it's
kind of a probability thing but there's
very very few particles that are going
to get farther than 10 microns or so so
he suggested that I use a beta emitter
the beta particles are much smaller and
higher speed so that would penetrate
farther into the supercritical co2 so I
got some beta emitters I got a strontium
90 source and this other thallium 204
source and put those in the
supercritical co2 chamber and brought it
to the supercritical point
hoping to see some trails I was
expecting to see beta particles just
like in a cloud chamber making trails of
bubbles or something but unfortunately
as you can see I didn't get any
visualization whatsoever I did this a
few times off-camera looking very
carefully and I really didn't see much
going on so looks like another dead end
kind of hoping someone will have a
suggestion since I think this really
should work there might be something
else that I'm missing for the strontium
90 source I took the little paper cover
off just so that I could get the
radiation disc flat flat in the chamber
the disc is a little bit wider than the
chamber is deep so it wouldn't sit down
flat
you
you
okay well if anything I hope the the
visuals here are interesting to look at
even though we're not seeing any
radiation trails let me know if you have
any suggestions and I will see you next
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