These Crosscutting Concepts and Science and Engineering Practices provide a comprehensive approach to understanding and teaching the principles of radioactivity within the framework of the NGSS.
The nuclei of certain atoms are stable and under ordinary circumstances, stable nuclei do not undergo change. The nuclei of other atoms are unstable. These nuclei undergo change spontaneously, that is ...
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Radioactivity is the spontaneous transformation of unstable atomic nuclei accompanied by the emission of ionizing radiation, typically in the form of alpha particles (helium-4 nuclei), beta particles ...
Providing recommendations on the application of the concept of clearance for materials, objects and buildings that are to be released from regulatory control, this publication supports the application ...
Editor’s note: This article is published after the passing away of Rod Ewing. The draft manuscript was prepared by both authors. It has been lightly edited for style, length, and clarity. Additional ...
Radioactivity is the spontaneous transformation of unstable atomic nuclei accompanied by the emission of ionizing radiation, typically in the form of alpha particles (helium-4 nuclei), beta particles ...
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