Säteilylähde

Säteilylähde is a Finnish term that translates to "radiation source" in English. It refers to any object or phenomenon that emits electromagnetic radiation or particulate radiation. This radiation can span a wide spectrum, from low-energy radio waves to high-energy gamma rays, and can also include streams of particles like alpha or beta particles.

Sources of radiation are diverse and can be natural or artificial. Natural radiation sources include cosmic rays originating from outer space, radioactive isotopes present in the Earth's crust (such as uranium and thorium), and naturally occurring radioactive elements within the human body. The sun is a primary natural source of electromagnetic radiation, providing visible light and heat, as well as ultraviolet and infrared radiation.

Artificial radiation sources are created by human activities. These include medical applications like X-ray machines and radiotherapy devices, industrial uses such as industrial radiography for material testing, and research instruments like particle accelerators. Nuclear power plants and nuclear weapons are also significant artificial sources of radiation.

The properties of radiation emitted by a source, such as its energy, intensity, and type, determine its potential effects and applications. Understanding radiation sources is crucial for fields ranging from physics and medicine to environmental science and nuclear safety. The study and management of radiation sources are essential for harnessing their beneficial uses while mitigating potential risks.