[Milsurplus] X-Ray Damage.. more

[Kees & Sandy]

The crystal in a Shure R7 is Bimorph Rochelle Salt
73 Kees K5BCQ
 

-- J Forster <jfor at quik.com> wrote:
Hi,

The pic I saw clearly showed damage from an arc or something like it. It
was burnt. Also, as I remember, crystal microphones are not made out of
quartz (it's far too stiff) but rather something like KDP or Rochelle
salt.

-John


Bob Camp wrote:

> Hi
>
> Unless the crystal was made from swept quartz (and thus is a "weapon")
> it will turn a nice dark black when you shoot it with a lot of x-rays.
> You can radiate them up into the megarad region without doing
> mechanical damage.
>
> EMP's have very little effect on a crystal. A crystal simply does not
> get enough energy from the pulse.
>
> Most shipping damage on crystals is pretty simple - somebody hit it
> with more shock than it could handle.
>
> The only crazy way to bust one is to hit it directly with a whole lot
> of DC. Enough voltage can peal the electrodes right off of the crystal
> element. It still doesn't produce mechanical damage.
>
> Bob
>
> On Oct 26, 2007, at 5:32 PM, J Forster wrote:
>
> > I was sent a pic of a damaged crystal elements that originated this
> > thread and it looks far to severe for something incidental to an X-
> > Ray.
> > It looks like there was an arc inside the case, so it seems possible
> > that someone along the shipping is exposing the packages to an EMP.
> > The
> > reasons for such exposure are obvious and likely justified by some
> > 'homeland security' cover.
> >
> > If such is the case, it may have more impact on the international
> > trade
> > in electronic items by individuals that the elimination of surface
> > shipping last spring.
> >
> > I'd be interested to hear of other examples
> >
> > Best,
> > -John
>

______________________________________________________________
Milsurplus mailing list
Home: http://mailman.qth.net/mailman/listinfo/milsurplus
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Milsurplus at mailman.qth.net

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://mailman.qth.net/pipermail/milsurplus/attachments/20071027/5eb7bcc8/attachment.htm