>> Cerenkov radiation (which even budget
>> equipped amateurs can detect and measure from incoming gamma rays) 
>> is
>> the result of photons (usually the ones termed Gamma rays)(photons 
>> on
>> speed) desperately adjusting their terms of reference to conform to
>> reality.

> Cherenkov radiation is _not_ produced by photons, only by 
> electrically
> charged particles, if they happen to travel faster than the speed of
> light in the medium.

You are, of course, correct.
But I was puzzled because I recalled that Cherenkov / Cerenkov (both 
names OK apparently) radiation is in fact used to detect energetic 
gamma ray arrivals. The excellent Wikipedia article you mention makes 
it clear.

    http://en.wikipedia.org/wiki/Cherenkov_effect

            When a high-energy cosmic ray interacts with the Earth's 
atmosphere, it may produce an electron-positron pair with enormous 
velocities. The Cherenkov radiation from these charged particles is 
used to determine the source and intensity of the cosmic ray, which is 
used for example in the Imaging Atmospheric Cherenkov Technique 
(IACT), by experiments such as VERITAS, H.E.S.S., and MAGIC. Similar 
methods are used in very large neutrino detectors, such as the 
Super-Kamiokande.



        Russell

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