[LRflex] Re: Kodachrome

  • From: David Simms <simmszee@xxxxxxxx>
  • To: leicareflex@xxxxxxxxxxxxx
  • Date: Mon, 20 Dec 2010 16:11:11 -0800 (PST)

Yea, I know that the wavelength of the x-rays has to be longer than the spaces 
in the conducting wrap. Thought it was...mea culpa.
With regard to jet engines...they're not entirely enclosed, are they? I've 
tried 
a couple of hair-brained experiments at home here...cell phone in a covered 
pot, 
call it and it doesn't ring. But, what I was really interested in was microwave 
ovens. The cell phone does ring inside a microwave. However, I thought that 
might be due to the power line acting as an antenna. Cell phone radiation must 
be of a longer wavelength than microwaves so, it has to be stopped by the 
faraday cage that surrounds the U-wave oven. Anyway, I'll check the 
wavelengths...if everything's on the level, the X-rays would have to be longer 
than the spaces between the crystals that make up aluminum foil if the foil 
will 
stop it, right?
back to the books.
Dave





________________________________
From: Charlie Falke <chfalke@xxxxxxx>
To: leicareflex@xxxxxxxxxxxxx
Sent: Mon, December 20, 2010 1:48:09 PM
Subject: [LRflex] Re: Kodachrome

On 20-Dec-10 4:10 PM, David Simms wrote:
> It is possible to nullify the effect of x_rays by wrapping the film in 
metallic
> foil. Since X-rays are part of the electromagnetic spectrum, they will not
> penetrate a conducting envelope. Naturally, they sell lead envelopes for this
> purpose to help air travelers preserve film. But, there's no reason why it has
> to be made of lead, aluminum foil will do just as well.
> Try Googling "Faraday cage".
>
> Dave
> Clearwater, BC
>

Dave,
    The lead bag reduces the x-ray exposure, but the operator
will just crank up the gain until he can see through it.
Aluminum will have very little effect.  A Faraday cage works
on EMF of much longer wavelength than X-rays, (large with
respect to the Faraday cage) or on electrostatic fields.
    We've X-rayed jet engines while they were running.

-- 
  Charlie Falke                                        _____      /\
                                                  | __/\__/------/__)
                                                  |(____\/_________/
  "One test result is worth                       |    |/        `o
    one thousand expert opinions" - Wernher Von Braun  0  N4003M
  "Imagination is more important than knowledge" - Albert Einstein

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