HHomeBackground Color:He
LiBeAmericium Pictures PageBlack White GrayBCNOFNe
NaMgAmericium Technical DataAlSiPSClAr
KCaAmericium Isotope DataScTiVCrMnFeCoNiCuZnGaGeAsSeBrKr
RbSrYZrNbMoTcRuRhPdAgCdInSnSbTeIXe
CsBaLaCePrNdPmSmEuGdTbDyHoErTmYbLuHfTaWReOsIrPtAuHgTlPbBiPoAtRn
FrRaAcThPaUNpPuAmCmBkCfEsFmMdNoLrRfDbSgBhHsMtDsRgCnUutUuqUupUuhUusUuo
Americium     

Americium

Atomic Weight 243[note]
Density 13.67 g/cm3
Melting Point 1176 °C
Boiling Point 2011 °C
Full technical data

A radioactive button like this is inside most smoke detectors. A trace of americium creates charged particles that betray the smoke. Americium is thus the only man-made element available in grocery stores.

Scroll down to see examples of Americium.
The Elements book Mad Science book Periodic Table Poster  Click here to buy a book, photographic periodic table poster, card deck, or 3D print based on the images you see here!
Americium Smoke detector circuit board

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Smoke detector circuit board.
The circuit board inside a cheap hardware store ionization type smoke detector, with the ionization chamber removed so you can see the americium button inside.
Source: Hardware Store
Contributor: Theodore Gray
Acquired: 1 May, 2009
Text Updated: 2 May, 2009
Price: $3
Size: 3"
Purity: <1%
Americium Cheap smoke detector

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Cheap smoke detector.
The case of a cheap hardware store ionization type smoke detector.
Source: Hardware Store
Contributor: Theodore Gray
Acquired: 1 May, 2009
Text Updated: 2 May, 2009
Price: $3
Size: 4"
Purity: <1%
Americium Modern spinthariscope

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Modern spinthariscope.
The spinthariscope was a popular amusement at academic parties in the early 1900s, or so I am told. Recently they have become available again on eBay and maybe other places. Antique ones used radium, but modern ones sensibly use americium, which is much safer and is easily available in any smoke detector.

After about 10 minutes of rigorous dark adaption (absolutely no light allowed) you can clearly see a swarming glow on the zinc sulfide screen, each flash representing the decay of a single atom of americium and the subsequent striking of the released alpha particle into the screen. It's amazing.

Here is an article about spinthariscopes.

Source: eBay seller geoelectronics
Contributor: Theodore Gray
Acquired: 10 September, 2003
Text Updated: 11 August, 2007
Price: $41
Size: 4"
Purity: <0.1%
Sample Group: Spinthariscopes
Americium Sample from the Everest Set

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Sample from the Everest Set.
Up until the early 1990's a company in Russia sold a periodic table collection with element samples. At some point their American distributor sold off the remaining stock to a man who is now selling them on eBay. The samples (except gases) weigh about 0.25 grams each, and the whole set comes in a very nice wooden box with a printed periodic table in the lid.

Radioactive elements like this one are represented in this particular set by a non-radioactive dummy powder, which doesn't look anything like the real element. (In this case a sample of the pure element isn't really practical anyway.)

To learn more about the set you can visit my page about element collecting for a general description and information about how to buy one, or you can see photographs of all the samples from the set displayed on my website in a periodic table layout or with bigger pictures in numerical order.

Source: Rob Accurso
Contributor: Rob Accurso
Acquired: 7 February, 2003
Text Updated: 29 January, 2009
Price: Donated
Size: 0.2"
Purity: 0%
Americium Intact smoke detector

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Intact smoke detector.
This is the outer casing of the ionization chamber inside an ordinary smoke detector, along with the text from the label on the back indicating its Americium content. Even though it's not radioactive on the outside, I've got it stored in the Hot Box.
Source: Hardware Store
Contributor: Theodore Gray
Acquired: 18 August, 2002
Price: $10/smoke detector
Size: 1.25"
Purity: >90%
Americium Smoke detector element

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Smoke detector element.
I'm told it's illegal to disassemble a smoke detector and remove the tiny radioactive dot that is contained in every ionization detector. But I did anyway, using an old one in May 2002. Considering that probably many thousands of these are disposed of (also technically illegally) in the garbage every year, I'm hardly the only one to mishandle the dots. My americium dot is now contained in a glued-shut box with a glass top that is harder to disassemble than the smoke detector was, and then inside a lead cup with a lid, just so our personnel manager doesn't freak out. (It was my first radioactive sample, but has since been vastly surpassed in radioactivity by the Fiestaware bowl.)

This article by Ken Silverstein (first published as "The Radioactive Boy Scout" in Harper's Magazine, November 1998) describes the amazing case of a teenage boy who did incredible (and incredibly dangerous) things with smoke detector americium. (The story is now available as a book by the same author.)

The sound is from the Geiger counter: I think most of the radioactivity is shielded by the glass cover glued in place over this sample, so it's not really representative (an unshielded one registers about 2000 counts per minute).

I chose this sample to represent its element in my Photographic Periodic Table Poster. The sample photograph includes text exactly as it appears in the poster, which you are encouraged to buy a copy of.
Periodic Table Poster

Source: Hardware Store
Contributor: Theodore Gray
Acquired: 15 May, 2002
Text Updated: 11 August, 2007
Price: $10/smoke detector
Size: 0.075"
Purity: >90%
Americium Photo Card Deck of the Elements

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Photo Card Deck of the Elements.
In late 2006 I published a photo periodic table and it's been selling well enough to encourage me to make new products. This one is a particularly neat one: A complete card deck of the elements with one big five-inch (12.7cm) square card for every element. If you like this site and all the pictures on it, you'll love this card deck. And of course if you're wondering what pays for all the pictures and the internet bandwidth to let you look at them, the answer is people buying my posters and cards decks. Hint hint.
Source: Theodore Gray
Contributor: Theodore Gray
Acquired: 19 November, 2008
Text Updated: 21 November, 2008
Price: $35
Size: 5"
Composition: HHeLiBeBCNOFNeNaMg AlSiPSClArKCaScTiVCrMn FeCoNiCuZnGaGeAsSeBrKr RbSrYZrNbMoTcRuRhPdAg CdInSnSbTeIXeCsBaLaCePr NdPmSmEuGdTbDyHoErTm YbLuHfTaWReOsIrPtAuHgTl PbBiPoAtRnFrRaAcThPaUNp PuAmCmBkCfEsFmMdNoLrRf DbSgBhHsMtDsRgUubUutUuq UupUuhUusUuo
The Elements book Mad Science book Periodic Table Poster  Click here to buy a book, photographic periodic table poster, card deck, or 3D print based on the images you see here!