[time-nuts] Gamma-ray and jitter
lists at rtty.us
Sun Nov 14 02:45:13 UTC 2010
Radiation sensitivity on swept quartz can be in the megarad region. For unswept quartz it's anybody's guess. Normal estimates are in the 10K rad range. It all depends on just what nasty impurities there are in the lattice.
On Nov 13, 2010, at 7:27 PM, Magnus Danielson wrote:
> On 11/14/2010 12:43 AM, Bob Camp wrote:
>> As always - eliminating environmental influence from the results can be challenging. Even with the parts in a vacuum chamber attached to a heated block, there can still be things that directly relate to the building going from day to night mode or from week day to week end mode.
>> That said - yes there are periodic influences. Everything I've seen appears to correlate to local time rather than sidereal time. I would admit that it could be a function of back fitting.
> If the measurements where long-term enough such that local time rather than sidereal time can be cancelled out and tied to the sidereal direction part of the puzzle is solved. However, showing that it is this gamma radiation effect in play and no other sidereal related effect is one thing.
> I'd like to see the correlation spanning over a year, a couple of years would be best. That way could local time effects clearly be separated from sidereal effects.
> Jitter measurements is usually not done continously, but wander measurements.
> Don't recall from the top of my head the effects of gamma-rays on crystals, but I do recall there is effects there. However, I do suspect they are rather poor gamma-ray detectors and loads of other sources to hide any correlation from direct observation.
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