all crystals would have been subject to X-rays to some extent because this
was how the planes were located and the cutting angles determined. The dose
rate was probably quite low in this case.....I dont remember seeing much
protection around the machine in the lab I worked in.
Alan
G3NYK
----- Original Message -----
From: "Charles P. Steinmetz" <[email protected]>
To: "Discussion of precise time and frequency measurement"
<[email protected]>
Sent: Thursday, August 01, 2013 2:52 PM
Subject: Re: [time-nuts] How quartz crystals are (were) fabricated
Bob wrote:
The X-Ray process does nothing good to the crystal. It's impact is highly
dependent on how "dirty" the crystal is.
Bob,
Do you have authoritative references for this proposition? If not, can
you identify what data and what inferences it is based on?
I could imagine the X-ray process relieving stress in the crystal (perhaps
to advantage), or disrupting the crystal structure (likely detrimental).
I'm interested to know if anyone has researched this in a systematic way
and, if so, what they found. (My intuition favors the disruption
hypothesis over stress relief, but I'm much more interested in research
and data than in intuition or speculation.) Data on other forms of
radiation would also be interesting, if research has been done. (We
already know that heat can be beneficial, at least in certain
circumstances, so I'm not so interested in that at the moment.)
Of course, when the X-ray technique was developed most crystals were not
housed in evacuated holders, so atmospheric and environmental factors were
larger contributors (at least to aging) than they are today. That could
have obscured researchers' ability to discriminate the effects of the
X-ray treatment in contemporaneous testing.
Best regards,
Charles
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