Teaching Material - Cloud Chamber

[CHRIS KUECHLE 937-5276 <KUECHLE.CHRIS@a1.abbott.com>]

Would the individual who provided the instructions for a simple cloud chamber 
please provide additional detail?  There's probably a number of elementary 
school teachers out there willing to try this, but they lack the time and 
resources needed to experiment in order to optimize the results.

Specifically -

Round clear container - plastic? glass? Ball or Mason jar?  Something bigger?
Cardboard Cover - shirt cardboard?  corrugate?
Denatured alcohol - what concentration?  where can it be purchased?
  Can the isopropyl alcohol availble from Walgreens be substituted?
  How long does it take alcohol to soak into the cardboard cover?
Clothing iron - suggested temperature setting?  (Trying to avoid burning
  cardboard, plastic meltdowns or potential "flaming apparati" problems, as
  the presence of said disasters in a classroom environment is sure to
  (1) discourage future experiments in nuclear science, and (2) set legions of
  bright young minds firmly on the road towards their MBA's ...)
Radiation Source - placed inside the container on the blotter material.  
  Does the blotter need to be wetted with the alcohol?

Any other thoughts or ideas?