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Have a look at the binding energy per nucleon curve: There are many stable configurations below iron, so the binding energy is not the only criterion for stability. Graph of nuclides (isotopes) by type of decay. Orange and blue nuclides are unstable, with the black squares between these regions representing stable nuclides. The unbroken line passing ...

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'Radioactive decays' tend to be categorised into 'alpha', 'beta' and 'gamma' decays. Alpha particles are helium nuclei, beta particles are electrons and gamma particles are electromagnetic radiation. To answer your question: It depends on the radioactive product, but gamma rays (which are produced in most radioactive decays) are electromagnetic waves.

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Radioactivity comes in three basic types. Gamma radiation is an electromagnetic wave just like light and radio waves but of higher energy, and is described using electrodynamics. Alpha and beta radiation is charged particles (helium nuclei and electrons respectively) and again the motion of charged particles is described using electrodynamics. So ...

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I'm not quite sure what you mean by "radioactive energies", but in general there are three types of radiation: $\alpha$ radiation: these are helium nuclei: He$^{2+}$. $\beta$ radiation: these are nothing more than electrons: e$^-$. $\gamma$ radiation: these are nothing more than photons (often denoted by $\gamma$), and are in fact traveling packets of ...

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I don't know if you have already solved the problem, but the same think happened to me when I ran the experiment. It turned out that whenever using a 90Sr source, you actually have a 90Sr/90Y radioactive source and they both undergo beta decay, but with different energies (2.28 MeV and 0.546 MeV). So for short distances you have the sum of the two spectra ...

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