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2025年1月17日 · radioactivity, property exhibited by certain types of matter of emitting energy and subatomic particles spontaneously. It is, in essence, an attribute of individual atomic nuclei.

Radioactive decay (also known as nuclear decay, radioactivity, radioactive disintegration, or nuclear disintegration) is the process by which an unstable atomic nucleus loses energy by radiation. A material containing unstable nuclei is considered radioactive. Three of the most common types of decay are alpha, beta, and gamma decay.

2024年8月12日 · Radioactivity occurs when an atom has an excess of energy, mass, or both, making its nucleus unstable. To reach a lower, more stable energy level, it releases energy in the form of radiation. This radiation can be emitted as particles or electromagnetic waves, depending on the nature of the decay.

Radioactive decay, also known as nuclear decay or radioactivity, is a random process by which an unstable atomic nucleus loses its energy by emission of radiation or particle. A material containing unstable nuclei is considered radioactive.

Radioactivity is the spontaneous release of energy from an unstable atom. Radioactive material is a solid, liquid, or gas that gives off radiation. Radiation is the energy that comes out of a radioactive atom. Radioactive isotopes, also known as radionuclides, are radioactive atoms of the same element that have different numbers of neutrons.

Radioactivity is the release of energy from the decay of the nuclei of certain kinds of atoms and isotopes. Atomic nuclei consist of protons and neutrons bound together in tiny bundles at the center of atoms.

2021年5月30日 · Radioactivity is the spontaneous emission of ionizing radiation from nuclear decay and reactions. The three main types of radioactive decay are alpha, beta, and gamma decay, but there are other nuclear reactions responsible for radioactivity.

2020年12月3日 · Radioactivity is the physical phenomenon by which the nuclei of unstable atoms (called radionuclides or radioisotopes) spontaneously transform themselves into other atoms by simultaneously emitting radiation, that is to say particles of matter. These nuclei are said to be radioactive. As they decay, radioelements emit radiation.

2021年1月17日 · Radioactivity is the release of energy from the decay of the nuclei of certain kinds of atoms and isotopes. Atomic nuclei consist of protons and neutrons bound together in tiny bundles at the center of atoms.