Marie Curie
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1 day ago · Radioactive decay (also known as nuclear decay, radioactivity, radioactive disintegration, or nuclear disintegration) is the process by which an unstable atomic nucleus loses energy by radiation. A material containing unstable nuclei is considered radioactive. Three of the most common types of decay are alpha, beta, and gamma decay.
2 days ago · It is the International System (SI) unit for measuring radioactivity. For example, a sample of a radioactive material may have an activity of 500 Bq, meaning there are 500 disintegrations per second. Curie (Ci): One curie equals 3.7 x 10^10 disintegrations per second. It is an older unit that is still used in some contexts, especially in the ...
5 days ago · In 2018, an unnamed astronaut on board the International Space Station (ISS) snapped this striking shot of a section of the Green River winding through a steep canyon in Utah. Shadows from the ...
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5 days ago · X-ray, electromagnetic radiation of extremely short wavelength and high frequency, with wavelengths ranging from about 10 −8 to 10 −12 metre and corresponding frequencies from about 10 16 to 10 20 hertz (Hz).
5 days ago · There are three common mechanisms for the production of X-rays: the acceleration of a charged particle, atomic transitions between discrete energy levels, and the radioactive decay of some atomic nuclei. Each mechanism leads to a characteristic spectrum of X-ray radiation.
4 days ago · Radiation therapy, also called radiotherapy, is a type of cancer treatment. This treatment uses beams of intense energy to kill cancer cells. Radiation therapy most often uses X-rays. But other types of radiation therapy exist, including proton radiation. Modern methods of radiation are precise.
5 days ago · Alpha particle, positively charged particle, identical to the nucleus of the helium-4 atom, spontaneously emitted by some radioactive substances, consisting of two protons and two neutrons bound together, thus having a mass of four units and a positive charge of two.
