Incandescent Filiment Support Prongs?
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Posted by Bob Masta on July 2, 2008, 7:54 am
Please log in for more thread options >says...
>> Incandescent bulbs may be hazardous as well: Animal studies of
>> tungsten shrapnel show that it is a very powerful carcinogen. I don't >> know how tungsten dust (which I assume must be inside the envelope >> after the filament burns out) would behave in the lungs, but I suspect >> the answer would be "not good". >
>Considering the original quantity of tungsten, and distribution of >'shrapnel', you have a low probability of ingest (stomach/lungs) enough >tungsten to be more than a minor irritant. From recollection it is >difficult to absorb tungsten through skin contact. As I recall, the animal studies used tiny particles of tungsten. The tumors were formed directly at the point of skin contact... no absorption needed. (I believe they "implanted" the particles through tiny incisions to hold them just under the skin surface.) But the alarming thing was that the particles were pretty much 100% effective at causing tumors... not like "increases the risk of", as we see for things like smoking or radon. Best regards, Bob Masta DAQARTA v4.00 Data AcQuisition And Real-Time Analysis www.daqarta.com Scope, Spectrum, Spectrogram, Sound Level Meter FREE Signal Generator Science with your sound card! | ||||||||||||||||
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Posted by whit3rd on July 5, 2008, 12:12 am
Please log in for more thread options > Are the filiment support prongs in an ordinary household incandescent
> light bulb made of Nickel metal or some type of Nickel alloy? Yes, usually. The old standard way to secure wires in glass, or to feed wires through a glass bulb, is to use Kovar wire (see <http://en.wikipedia.org/wiki/Kovar>) and a selected
type of glass for the bulb base assembly (though the bulb
fused to the base might be a different material). | ||||||||||||||||
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