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ic-racer

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They could sell briquettes of corium to pack with one's lenses for storage...

corium copy.jpg
 

guangong

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Does anybody else remember the Lone Ranger Silver Bullet Atomic Ring. Peeking into the cartridge end, flashes on a tiny screen indicated striking radium atoms.
Another change in the times. We would tape our nickels,dimes, and box tops on to penny postcards for our decoder badges(Capt. Midnight), and all the other stuff, and apparently the money arrived safely
 

markjwyatt

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UV light has nothing to do with radioactivity. You should know better than that.

UV radiaiton has nothing to do with radiation?

 

snusmumriken

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UV radiaiton has nothing to do with radiation?

Radium decays by emitting alpha particles (ie helium nucleus), not photons of light.
 

Don Heisz

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We would tape our nickels,dimes, and box tops on to penny postcards for our decoder badges(Capt. Midnight), and all the other stuff, and apparently the money arrived safely

It would now be ripped off by the gears of the sorting machine - like some of the emulsion on 1/5 of the postcards in the postcard exchange.
 

markjwyatt

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Radium decays by emitting alpha particles (ie helium nucleus), not photons of light.

Gamma rays are the most potent and dangerous form of radiation, and they are photons of light. There is some gamma ray action in lanthunum for instance (used in some radioactive lens glasses) which emits some gamma radiation as part of its decay process ( https://www.spectroscopyeurope.com/...amma-spectroscopy-without-radioactive-sources ), as does radium (https://en.wikipedia.org/wiki/Radium#:~:text=Exposure to radium, internal or,0.1 micrograms of ingested radium.).

"A sample of radium metal maintains itself at a higher temperature than its surroundings because of the radiation it emits – alpha particles, beta particles, and gamma rays. More specifically, natural radium (which is mostly 226Ra) emits mostly alpha particles, but other steps in its decay chain (the uranium or radium series) emit alpha or beta particles, and almost all particle emissions are accompanied by gamma rays.[17]...<large gap in text>...Exposure to radium, internal or external, can cause cancer and other disorders, because radium and radon emit alpha and gamma rays upon their decay, which kill and mutate cells.[14]"

Also, when we start talking particle physics, particles and photons become somewhat entwined.
 
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markjwyatt

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I just checked my Staticmaster brush and, indeed, it is .5 degrees C warmer than everything else in the room. That's great! Means it still works.

Satellites and space craft especially use radiation to drive thermopiles that generate electricity form the heat and power some of the electronics. Space craft move far from the sun, so solar energy is less useful, and radioactive piles can produce a lot of heat and drive electricity for a long time.
 

Sirius Glass

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UV radiaiton has nothing to do with radiation?


There is a difference between solar radiation and radioactivity. Very basic physics.
 

Sirius Glass

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I understood that you should not leave lenses in hot sunshine because it can melt the grease which then creeps over the elements.

I never said to put the lenses in a place that gets hot. An inside window would get sunlight for a few hours and should not get hot, if so move the lenses.
 

Sirius Glass

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Satellites and space craft especially use radiation to drive thermopiles that generate electricity form the heat and power some of the electronics. Space craft move far from the sun, so solar energy is less useful, and radioactive piles can produce a lot of heat and drive electricity for a long time.

That is why Voyager I & II, Galileo and many other interplanetary spacecraft care radioactive power sources.
 

markjwyatt

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There is a difference between solar radiation and radioactivity. Very basic physics.

We do get gamma rays from solar flares. It is not as different as you may think. UV is moving more towards the visible spectrum, and yes is somewhat different, but still related.
 
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