Quote:
Originally Posted by space_charged
Don't think the concentration of helium in the atmosphere would make that a significant factor. Any such would have to have been produced by radioactive decay. Any produced would head up fast in any case. Different story if the CRT was put in a closed vessel with helium gas in it.
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Yes, there's no helium in the atmosphere. Any that gets loose rapidly disappears off into outer space. It may seem strange but any helium we have is dug out of the ground where it got trapped after being produced by radioactive decay. A helium atom is basically an alpha particle. Pure hydrogen will also disappear off into space. However hydrogen reacts with other elements and forms things like water whereas helium is a noble gas and doesn't form compounds.