A cyclotron is sometimes used for carbon dating

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Some smoke detectors contain a small amount of Americium-241, an alpha emitter (and low energy gamma emitter) with a half life of 460 years.It consists of an ionisation chamber linked to a simple electronic alarm circuit The Americium ionises the air between the plates, causing a current to flow.This is possible because some natural elements tend to concentrate in certain parts of the body: iodine in the thyroid, phosphorus in the bones, potassium in the muscles.When a patient is injected with a radioactive element, a special camera can take pictures of the internal workings of the organ.Smoke entering the detector blocks some of the alpha particles, lowering the current, and triggering the alarm.

If the rate is too low the rollers automatically move closer to each other (making the paper thinner) and vice versa.

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