Potassium-40 - Wikipedia
网页Potassium-40 (40K) is a radioactive isotope of potassium which has a long half-life of 1.25 billion years. It makes up about 0.012% (120 ppm) of the total amount of potassium found in nature. Potassium-40 undergoes three types of radioactive decay.
Potassium-40 – Characteristics – Half-life - Nuclear Power for ...
网页Potassium-40 is an unstable (radioactive) naturally occurring isotope of potassium and has a very long half-life of 1.251×10 9 years. Therefore, this isotope belongs to primordial nuclides because its half-life is comparable to the age of the Earth.
Potassium-40 - isotopic data and properties - ChemLin
网页Potassium-40 - symbol 40 K - is a naturally occurring, primordial, radioactive isotope of the chemical element potassium with a half-life of 1.25 billion years; Earth's potassium consists of about 0.0117% (117 ppm) of this isotope, which is responsible for the weak natural radioactivity of the alkali metal.
Potassium-40 - radioactivity.eu.com
网页Potassium 40 is a radioisotope found in trace amounts in natural potassium, is at the origin of more than half of the human body activity: undergoing between 4 and 5,000 decays every second for an 80kg man.
Potassium-40 - Wikiwand
网页Potassium-40 (40K) is a radioactive isotope of potassium which has a long half-life of 1.25 billion years. It makes up about 0.012% (120 ppm) of the total amount of potassium found in nature.
Potassium-40 | physics | Britannica
网页Potassium-40 decays predominantly by β-emission to calcium-40, having a measured mass 39.962589. Through Einstein’s equation, energy is equal to mass (m) times velocity of light (c) squared, or E = mc2, the energy release (Q) and the mass….
Body Potassium Content and Radiation Dose from 40 K for the …
网页2016年4月25日 · Potassium-40 is a naturally occurring radionuclide. According to various data its content in the body of an adult person with body weight 70 kg ranges from 4,000 to 5,000 Bq due to the considerable amount of stable potassium in the body (about 140 g).
Isotopes of potassium - Wikipedia
网页Isotopes of potassium (19K) Ar by either electron capture or positron emission. This latter decay branch has produced an isotopic abundance of argon on Earth which differs greatly from that seen in gas giants and stellar spectra. 40. K has the longest known half-life for any positron-emitter nuclide.
Rare 40K decay with implications for fundamental physics and ...
网页2023年7月31日 · Potassium-40 is a widespread, naturally occurring isotope whose radioactivity impacts estimated geological ages spanning billions of years, nuclear structure theory, and subatomic rare-event searches—including those for dark matter and neutrinoless double-beta decay.
Potassium K-40 | K | CID 6328542 - PubChem
网页2021年10月14日 · Potassium-40 is a naturally occurring radioactive isotope of potassium. Potassium is the chemical element with the symbol K and atomic number 19. Potassium is widely distributed in nature and is present in all plant and animal tissues.