Radionuclides | US EPA
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.
Radionuclide - Wikipedia
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.
NNDC | National Nuclear Data Center
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.
放射性核素 - 维基百科，自由的百科全书
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 …
What are radionuclides? Uses and dangers - Nuclear energy
2015年10月2日 · A radionuclide is an unstable nuclide that, therefore, degenerates by emitting ionizing radiation. Types and uses of radioisotopes.
Radionuclides (radioactive materials) | Chemical Classifications ...
2008年8月14日 · 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 …
Radionuclide | NRC.gov
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.
Radionuclide - Radioisotope | nuclear-power.com
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.
放射性核素 - 百度百科
它是指不稳定的原子核，能自发地放出射线（如α射线、β射线等），通过衰变形成稳定的核素。 衰变时放出的能量称为衰变能，衰变到原始数目一半所需要的时间成为衰变半衰期，其范围很广，分布在10 15 年到10 -12 秒之间。 2017年10月27日， 世界卫生组织 国际癌症研究机构公布的致癌物清单初步整理参考，放射性核素，α粒子、β粒子放射，内部沉积在一类致癌物清单中。 放射性核素，也叫不稳定核素，是相对于稳定核素来说的。 它是指不稳定的 原子核，能自发地放出射 …
Radionuclide - an overview | ScienceDirect Topics
Radionuclides are atoms with an unstable nucleus that can be naturally occurring or artificially produced in laboratories. They possess different decay types and half-lives, and their presence in the environment can have significant impacts on living organisms through ionizing radiation.