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In physics, radiation is the emission or transmission of energy in the form of waves or particles through space or a material medium. This includes: electromagnetic radiation consisting of photons, such as radio waves, microwaves, infrared, visible light, ultraviolet, x-rays, and gamma radiation (γ)particle radiation consisting … 展开
There are two sources of high energy particles entering the Earth's atmosphere from outer space: the sun and deep space. The sun continuously emits particles, primarily free … 展开
Electromagnetic radiation of wavelengths other than visible light were discovered in the early 19th century. The discovery of infrared radiation is … 展开
The kinetic energy of particles of non-ionizing radiation is too small to produce charged ions when passing through matter. For non-ionizing electromagnetic radiation (see types … 展开
Medicine
Radiation and radioactive substances are used for diagnosis, treatment, and research. X-rays, for … 展开On Earth there are different sources of radiation, natural as well as artificial. Natural radiation can come from the Sun, Earth itself or from 展开
CC-BY-SA 许可证中的维基百科文本 Electromagnetic radiation - Wikipedia
In physics, electromagnetic radiation (EMR) consists of waves of the electromagnetic (EM) field, which propagate through space and carry momentum and electromagnetic radiant energy.
Classically, electromagnetic radiation consists of electromagnetic waves, which are synchronized oscillations of electric and magnetic fields. In a vacuum, electro…Wikipedia · CC-BY-SA 许可下的文字辐射 - 维基百科，自由的百科全书
輻射 在 物理學 上指的是 能量 以 波 或是 次原子粒子 移動的型態，在 真空 或 介質 中傳送。. [1][2] 包含: 電磁波: 微波 、 可見光 、 X射線 、 γ射線 (γ) 粒子輻 …
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Radiation therapy - Wikipedia
Radiation therapy or radiotherapy (RT, RTx, or XRT) is a treatment using ionizing radiation, generally provided as part of cancer therapy to either kill or control the growth of malignant cells. It is normally delivered by a linear particle accelerator.
Thermal radiation - Wikipedia
Thermal radiation is the emission of electromagnetic waves from all matter that has a temperature greater than absolute zero. [5][2] Thermal radiation reflects the conversion of thermal energy into electromagnetic energy. Thermal energy is …
Radiation exposure - Wikipedia
Radiation exposure is a measure of the ionization of air due to ionizing radiation from photons. [1] It is defined as the electric charge freed by such radiation in a specified volume of air divided by the mass of that air. [ 1 ]
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放射性 - 维基百科，自由的百科全书
放射性 或 辐射性[1] 是指某 核種 的 原子核 不穩定，會自发性地放出 游離輻射 （如 α射线 、 β射线 、 γ射线 等）而 衰变 成另一種核種（衰变产物），這種特性稱為放射性。. 衡量 放射性強度 的 國際單位 為 貝克勒 （Bq），傳統單位則 …
普朗克黑体辐射定律 - 维基百科，自由的百科全书
在 物理学 中， 普朗克黑体辐射定律 （英語： Planck's law， Blackbody radiation law，也简称作 普朗克定律 或 黑体辐射 定律）是指在任意 温度 下，从一个 黑体 中发射出的 电磁辐射 的 辐射率 与 频率 彼此之間的关系。. 在这裏，辐射率 …
What is Radiation? | IAEA
2023年1月25日 · Radiation is energy that moves from one place to another in a form that can be described as waves or particles. We are exposed to radiation in our everyday life . Some of the most familiar sources of radiation include the …
Radiation - Simple English Wikipedia, the free encyclopedia
Learn about radiation in physics, including its types, sources, effects, and examples. Find out the difference between ionizing and non-ionizing radiation, and how they affect living things and …
