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Sampling Am
Americium is an artificial element which has no stable isotopes.
The best way to obtain a sample of Am is from ionization smoke detectors, where the Am-241 isotope is used as a strong source of alpha particles. Gamma emissions from this isotope are rather low.
More information about decay properties:

The amount of Am-241 used in smoke detectors is usually 0.9-1.0 micro-Ci (33-37 kBq), which roughly equals to 0.25-0.28 microgram.

My measurement of a 0.9 μCi source has shown ~500 μSv/h of alpha+beta+gamma and ~1 μSv/h of gamma-only.

Here a photo of the Am-241 source in a smoke detector:

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