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1 minute ago, John Lambies Doos said:
19 minutes ago, welshbairn said:
They get absorbed by the air within a few centimetres and by the alarm structure itself. All you get is a tiny amount of helium in the air.
http://firewize.com/node/24

Cheers, but why don't you inhale these particles when changing alarm?

Worst that would happen is you might get a squeaky voice if you stick your face right in it for ages (not really). There's a tiny amount compared to normal background radiation that you're taking in all the time.

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Worst that would happen is you might get a squeaky voice if you stick your face right in it for ages (not really). There's a tiny amount compared to normal background radiation that you're taking in all the time.
OK, but they say the source is extremely dangerous is inhaled or ingested? So surely you must be inhaling when changing alarm?
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Just now, John Lambies Doos said:
2 minutes ago, welshbairn said:
Worst that would happen is you might get a squeaky voice if you stick your face right in it for ages (not really). There's a tiny amount compared to normal background radiation that you're taking in all the time.

OK, but they say the source is extremely dangerous is inhaled or ingested? So surely you must be inhaling when changing alarm?

Read the link I posted.

Quote

Even swallowing the radioactive material from a smoke detector would not lead to significant internal absorption of Am-241, since the dioxide is insoluble. It will pass through the digestive tract, without delivering a significant radiation dose. (Americium-241 is however a potentially dangerous isotope if it is taken into the body in soluble form. It decays by both alpha activity and gamma emissions and it would concentrate in the skeleton.)

 

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3 minutes ago, John Lambies Doos said:
5 minutes ago, welshbairn said:
Worst that would happen is you might get a squeaky voice if you stick your face right in it for ages (not really). There's a tiny amount compared to normal background radiation that you're taking in all the time.

OK, but they say the source is extremely dangerous is inhaled or ingested? So surely you must be inhaling when changing alarm?

I think you've been inhaling something all right.

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31 minutes ago, John Lambies Doos said:

OK, so I opened it all up and there is a small bit, size of grain of sugar underneath the shield. It's soft to touch and smells like chicken.
Any ideas?

Well, if you get your hands on a couple of billion more smoke detectors, you could combine all the Americium together and build an atomic bomb.  So I believe.

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Yes, the alpha particles emitted by the Americium  ionise the air which allows a small current to flow between two electrodes on the smoke detector.  If smoke particles are present, they disrupt the current, trigger an alarm and the smoke detector tells you that your toast is cooked.

Just think, you have in your house a man-made element that doesn't occur naturally on Earth.  Science is great.

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