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On about < the mean free path of the electrons in the residual gas.
Given in the article 0.002" (~ 51 E-6 m), so go figger.
Not the best for calculation:
http://mysite.du.edu/~jcalvert/phys/scat.htm
bc skimmed
On 2008, Oct 23, , at 14:18, Marc "Zeke" Kossover wrote:
> I wonder how hard the vacuum needs to be? 10^-5? 10^-8?
>
> Zeke
>
> ----- Original Message ----
> From: Tom Kramer <tmkramer@alum.mit.edu>
> To: tap-l@lists.ncsu.edu
> Sent: Thursday, October 23, 2008 1:59:19 PM
> Subject: [tap-l] X-Rays Detected From Scotch Tape
>
> My wife saw this on aol:
>
> <http://news.aol.com/article/x-rays-detected-from-scotch-tape/221637>
>
>