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So it turns into Np, and electrons just falling into 'free new' levels and emmiting, right?

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Give me a link where to read, please, if it's very easy to answer.

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up vote 0 down vote accepted

This is a complicated decay with many possible modes--there are one or more gamma associated with every alpha line (except, perhaps the highest energy one).

It is essentially impossible to compute the photon spectrum from first principles; they must be measured and doing so well is a delicate experiment.

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Thank you! Can you say, what is the reason of 26.3 keV (Am gamma peak)? – Alej Mar 6 '13 at 18:02
That's a prompt gamma in coincidence with the alpha decay. – dmckee Mar 6 '13 at 18:06

241-Am emits several gamma rays, but 35.9% gamma rays will have 59.5412 keV energy that can be easily detected with a scintillation detector fitted with NaI (Tl) crystal.

The following Reference also provides various alpha energies from 241-Am.

Reference: WWW Table of Radioactive Isotopes

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