With all the radiation from natural and man-made sources, we should quite reasonably be concerned about how all the radiation might affect our health. The Ionizing and Penetration Power of Radiation Some later time, alpha particles were identified as helium-4 nuclei, beta particles were identified as electrons, and gamma rays as a form of electromagnetic radiation like x-rays, except much higher in energy and even more dangerous to living systems. These particles were named using the first three letters of the Greek alphabet.
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