2024年9月24日 · Below you will find links to basic information about twelve radionuclides encountered in medical, commercial, and military activities. These pages contain information about the properties of the element, how it moves through the environment, where you may find it (the radiation source) and potential health effects. Americium-241. Cesium-137.

A radionuclide (radioactive nuclide, radioisotope or radioactive isotope) is a nuclide that has excess numbers of either neutrons or protons, giving it excess nuclear energy, and making it unstable.

ENSDF contains recommended nuclear structure and decay data for all the known nuclides, which are obtained following a critical review of all available experimental data, supplemented with systematic trend studies and theoretical models.

Radionuclides (or radioactive materials) are a class of chemicals where the nucleus of the atom is unstable. They achieve stability through changes in the nucleus (spontaneous fission, emission of alpha particles, or conversion of neutrons to protons or the reverse).

放射性核種 （英語： radionuclide 或 radioactive nuclide），又稱作 放射性 同位素 （英語： radioactive isotope），是指 原子核 不穩定、具有 放射性 的 核種。 放射性核種會發生 放射性衰變，放出 游離輻射 （如 α射線 、 β射線 、 γ射線 等），衰變成其他核種。 每種放射性核種的核穩定性各不相同， 半衰期 有長有短。 放射性核種的半衰期沒有已知的時間上下限，範圍可以到55個數量級，短至幾乎瞬間（如 鈹-8），長至 宇宙年齡 的一兆倍（如 氙-124）。 穩定性愈高的放 …

2015年10月2日 · A radionuclide is an unstable nuclide that, therefore, degenerates by emitting ionizing radiation. Types and uses of radioisotopes.

2025年2月11日 · A radioactive isotope, also known as a radioisotope, radionuclide, or radioactive nuclide, is any of several species of the same chemical element with different masses whose nuclei are unstable and dissipate excess energy by spontaneously emitting radiation in the form of alpha, beta, and gamma rays. Every chemical element has one or more ...

2021年3月9日 · Radionuclide. An unstable isotope of an element that decays or disintegrates spontaneously, thereby emitting radiation. Approximately 5,000 natural and artificial radioisotopes have been identified.

Some nuclides are unstable and radioactive. These nuclides are known as radionuclides (radioactive nuclides) or radioisotopes (radioactive isotopes). These unstable isotopes decay through various radioactive decay pathways, most commonly alpha decay, beta decay, gamma decay, or electron capture.

Radionuclides are used in diagnostic imaging and cancer therapy. A chemical substance, called an isotope, that exhibits radioactivity. A gamma camera, used in nuclear medicine procedures, will pick up the radioactive signals as the substance gathers in an organ or tissue. They are sometimes referred to as tracers.