Potassium- 40
Potassium-40 (40K) is a radioactive isotope of potassium which has a very long half-life of 1.248×109 years.
Potassium-40 is a rare example of an isotope that undergoes all three types of beta decay. About 89.28% of the time, it decays to calcium-40 (40Ca) with emission of a beta particle (β−, an electron) with a maximum energy of 1.33 MeV and an antineutrino. About 10.72% of the time it decays to argon-40 (40Ar) by electron capture, with the emission of a 1.460 MeV gamma ray and a neutrino. Very rarely (0.001% of the time) it will decay to 40Ar by emitting a positron (β+) and a neutrino.

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What is the nuclear decay equation for potassium-40 - WikiAnswers
There are three beta decay modes for 40K, and so three equations. The equation for ... The equation for the decay of 40K by electron capture is: 1940K + -10e ...
Potassium-40 - Wikipedia, the free encyclopedia
Potassium-40 (40K) is a radioactive isotope of potassium which has a very long half-life of 1.248×109 years. Potassium-40 is a rare example of an isotope that ...
General Information About K-40 - Oak Ridge Associated Universities
Jan 20, 2009 ... General Information About K-40. Paul Frame, Oak Ridge Associated Universities. Potassium-40(K-40) is a naturally-occurring radionuclide.
Potassium-40 and Evolution of Higher Life - Fourmilab
Jul 15, 1996 ... 86% of the total endogenous dose is from K-40 and essentially all the rest from C -14, but the C-14 is believed to be much more significant ...
Radioactivite : Potassium 40
Argon 40, a gas held prisoner by lava. The potassium-argon method is frequently used to date lava flows whose age is between a million and a billion years.
why is there so much potassium 40 in the milk US wide | Department ...
Apr 24, 2011 ... Specifically if you look for potassium 40 numbers they are very high in pasteurised milk during april, ( ~1300 pCi/litre ) many times higher than ...
Potassium, a Radioactive Element?
The potassium isotope of interest is a radioactive isotope, K40. It is present in all potassium at a very low concentration, 0.0118 %. It has a very long half-life, ...
Potassium-40 heats up Earth's core - physicsworld.com
May 7, 2003 ... Geophysicists have found evidence for an extra source of heat inside planets.
Radioactive Half-life of Potassium-40 - Chem21Labs
potassium chloride, and determine the half-life of radioactive K-40, which occurs ... One of the radioactive decay products of K-40 is Argon-40, and is of particular.
Potassium - Wikipedia, the free…
Potassium is a chemical element with symbol K (from Neo-Latin kalium) and atomic number 19. Elemental potassium is a soft silvery-white alkali metal that oxidizes ...
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Potassium- 40 in science
Potassium-40 heats up Earth's core - physicsworld.com
May 7, 2003 ... V Rama Murthy from the University of Minnesota and colleagues have shown that potassium-40 can exist in the core of the Earth and provide ...
Potassium-Argon Dating - Archserve.id.ucsb.edu
Dec 15, 2005 ... It is based on the fact that some of the radioactive isotope of Potassium, Potassium-40 (K-40) ,decays to the gas Argon as Argon-40 (Ar-40).
Comparative Evaluation of a Whole-Body Counter Potassium 40 ...
Abstract. An evaluation of the whole-body counter potassium 40 (40K) method of lean body mass (LBM) determination was made using the University of Florida ...
Natural Radioactivity - Idaho State University
Potassium 40, 40K, 1.28 x 109 yr, soil - 1-30 pCi/g (0.037-1.1 Bq/g) ... decay process works with this interesting Decay Science Trek from University of Colorado.
[PDF]Potassium-40 for the Discrimination between Honey and Dates Syrup
Potassium-40 for the Discrimination between Honey and Dates Syrup. Dr. Mabrouk O. Allagi. PhD. Nuclear Engineering, University of Cambridge, UK. MSc.
K–Ar dating - Wikipedia, the free encyclopedia
The long half-life of 40K allows the method to be used to calculate the .... and thermochronology by the 40Ar/39Ar method, Oxford: Oxford University Press, ISBN ...
[PDF]The Hyperfine Structure of Potassium-40 - University of Toronto
The Hyperfine Structure of Potassium-40. Lindsay J. LeBlanc. April 12, 2006. 1 Introduction. In the world of atomic physics, the alkali atoms sit in a place of ...
Precision Determination of the Energy of the Gamma Ray of ...
Western Reserve University, Cleveland, Ohio and Soreq Research Establishment, ... The gamma ray of potassium-40 was compared with the 1368- keV line of ...
Body Composition: Relative in vivo Determinations from Potassium ...
Measurements of body composition from serial, in vivo determinations of potassium-40 were made on 51 obese human subjects who were placed on a low ...
Lamb Carcass and Live Lamb Evaluations by Potassium-40 and ...
In live lambs, the correlations between potassium-40 activity and percent edible ... of Purdue University in partial fulfillment of the requirements for the degree of ...
Books on the term Potassium- 40
Guidelines for Drinking-water Quality: Recommendations
Guidelines for Drinking-water Quality: Recommendations
World Health Organization, 2004
The gross beta measurement includes a contribution from potassium-40, a beta emitter that occurs naturally in a fixed ratio to stable ... Potassium-40 does not accumulate in the body but is maintained at a constant level independent of intake.
The Earth Through Time
The Earth Through Time
Harold L. Levin, 2009
‡Although potassium-40 decays to argon-40 and calcium-40, only argon is used in the dating method because most minerals contain considerable calcium-40, even before decay has begun. Crystals of calcite growing on the lead ore mineral  ...
The Ancestor's Tale: A Pilgrimage to the Dawn of Evolution
The Ancestor's Tale: A Pilgrimage to the Dawn of Evolution
Richard Dawkins, 2005
Volcanic rocks often contain radioactive isotopes, such as potassium 40. Potassium 40 decays to ... Fortunately, when potassium 40 in a rock crystal decays, the argon 40 (a gas) remains trapped in the crystal. If there are equal amounts of ...
Modular Science for AQA.: Higher. Year 11
Modular Science for AQA.: Higher. Year 11
Keith Hirst, 2002
This often contains the radioisotope potassium-40, which slowly decays to become argon-40, a stable isotope. At first, the newly formed rock contains no argon, because argon is a gas which escapes from the molten rock. As the potassium ...
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Potassium- 40
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Posted on June 20, 2013 by admins.
Potassium-Argon Dating Methods | Anthropology
The potassium-argon (K-Ar) isotopic dating method is especially useful for determining the age of lavas. Developed in the 1950s, it was important in develping
Cargill Salt 40# Potassium Chloride Pellets 7376 - Snow Removal Online
Snow Removal Online: Cargill Salt 40# Potassium Chloride Pellets 7376, Review, Ratin
Oceanlife’s new aquarium potassium test kit (k)
Today we talk about the new test of Potassium by Oceanlife just introduced on the market. As you can see from the picture the test is composed, as usual, from...
Fake Science Alert: Fukushima Radiation Can’t Be Compared to Bananas or X-Rays | Washington's Blog
Posted on April 1, 2013 by WashingtonsBlog.
Cargill Salt 13600 “Diamond Crystal” Potassium Chloride 40 Lb. | Water Softeners
Quantum Diaries
I was recently preparing a “Physics of Angels & Demons” talk for a group of high school physics teachers who were visiting Cornell for a “Contemporary Physics for Teachers” workshop. While researching ‘natural sources of antimatter,’ I discovered a curious article about a naturally occurring potassium isotope that, some fraction of the time, decays via positron emission.
DAUN: Which is more radioactive, Potassium-40 or Thorium-232?
Recently one professor and one nuclear scientist claimed that potassium-40 is far LESS radioactive than Thorium-232 and they cited the EPA (environment protection agency of American) and the WHO UNSCEAR as proof of their statements!One of my friends who stated that K-40 is about 62 times more radioactive than Thorium-232 was rubbished by the nuclear scientist!Well, that depends on what we are talking about. Quote ” It was written somewhere above that potassium-40 is 62 times more radioactive than thorium.