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Radiation - Wikipedia
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
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