Older smoke detectors contain small amounts of Americium; the ionizing alpha radiation from the stuff makes it possible to run a small electrical current through the air between two electrodes. If aerosol particles (such as smoke) make their way between the electrodes, they absorb the alpha particles, causing the inter-electrode air to no longer be ionized, killing the current across the gap and tripping the alarm.
This was a SCAV item one year...and it is the reason that the Hot Side Hot no longer puts joke items like this on the list.
I imagine this guy was inspired by David Hahn, who attempted the same thing in 1994 as a kid and later in 2007. He had some nasty radiation burns on his face from his 2007 attempt.
What's the NRA's stance on this issue? I assume something like "You'll take my homemade nukes when you can pry them from my hot dead hands." or "I just use it for hunting."
Now imagine a not too far off future when bio grad students will be able to create viruses in their garages. The material barrier will be far lower, I suspect.
Funny - I had exactly the same thought when I read the article. Too bad we are so stupid as a society that we throw them in jail instead of giving them 10 years of free tuition to Harvard.
@12 I'll give you that... I was actually going to point to David Hahn as another case.
Also http://www.unitednuclear.com/ for all your radioactive source and/or detector needs. You can usually buy chunks of pitchblende too, but it looks like they're sold out.
Don't all smoke detectors contain Americium? Isn't that what makes them work? I know it's radioactive, but I thought it was mostly only good for detecting smoke.
@15: Well, there are some optical detectors, but pretty much all ionization detectors use Americium; it emits more alpha radiation and less gamma radiation than radium.
This was a SCAV item one year...and it is the reason that the Hot Side Hot no longer puts joke items like this on the list.
http://en.wikipedia.org/wiki/David_Hahn
Also http://www.unitednuclear.com/ for all your radioactive source and/or detector needs. You can usually buy chunks of pitchblende too, but it looks like they're sold out.