[time-nuts] Thinking outside the box a super reference

Gerhard Hoffmann dk4xp at arcor.de
Sat Nov 5 06:34:30 EDT 2016


Am 05.11.2016 um 00:45 schrieb David:
> On Fri, 04 Nov 2016 14:39:54 -0700, you wrote:
>> 87-Rb has a half life of something like 4.9e10 years — you'll be waiting
>> a while for that strontium. /gp
> Various online sources say that natural rubidium is radioactive enough
> to fog photographic film in 1 to 2 months but that is also the case
> with unprocessed uranium ore so I would not worry about it at all.
That's next to nothing. A friend of mine with interest in minerals found a
piece of Pechblende (Uranit) simply laying on the street near 
St.Joachimsthal
where they used to dig for silver over the centuries and after 1945 for 
uranium.

We put it on a sheet of Polaroid film for the Tektronix scope cameras and
sure enough, next morning we could see the silhouette of the stone,
completely white, probably way overexposed.

regards, Gerhard



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