| 1. | This is made by the alpha decay of Ac-225.
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| 2. | When they result from radioactive alpha decay they have low penetration depth.
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| 3. | Alpha decay energy follows the same trend as for other heavy elements.
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| 4. | Some lighter elements have isotopes with alpha decay as a rare branch.
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| 5. | Here, to the left, we now have an alpha decay.
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| 6. | Radium does not emit anything other than alpha decay particles.
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| 7. | CRESST-I first detected the alpha decay of tungsten.
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| 8. | It undergoes alpha decay to the extremely long-lived bismuth-209.
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| 9. | Like other cluster decays, alpha decay is fundamentally a quantum tunneling process.
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| 10. | Thus it is the only promethium isotope with an experimentally observed alpha decay.
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