Topic: The Amino Acid Racemization Dating Method | The Institute.

At a widely publicized news conference in August of 1972, Dr. Jeffrey Bada of Scripps Institute of Oceanography announced the 'discovery' of a new dating method based on the rate of racemization of amino acids in fossil material.

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EMP effect on electrical transformers | Peak Energy. Dr. Jeff Masters. 3 Apr 2009. A future Space Weather catastrophe: a disturbing possibility.. We have the very real possibility that a geomagnetic storms of an intensity that has happened before–and will happen again–could knock out the power to tens of millions of Americans for multiple years.

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The various dating techniques available to archaeologists The various dating techniques available to archaeologists by Michael G. Lamoureux, March/April 2009 Introduction. Today's archaeologist has a wide variety of natural, electro-magnetic, chemical, and radio-metric dating methodologies available to her that can be used to accurately date objects that are just a few hundred years old as well as objects that are a few million years old with high.

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thorium | Description, Properties, & Uses | Britannica.com Thorium (Th), radioactive chemical element of the actinoid series of the periodic table, atomic number 90; it is a useful nuclear reactor fuel. Thorium was discovered (1828) by Swedish chemist Jöns Jacob Berzelius.It is silvery white but turns gray or black on exposure to air. It is about half as abundant as lead and is three times more abundant than uranium in Earth’s crust.

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Protactinium Element Facts - Periodic Table of Elements. Appearance and Characteristics. Harmful effects: Protactinium is harmful due to its radioactivity and is also toxic. Characteristics: Protactinium is a very rare shiny, silvery, highly radioactive metal that tarnishes slowly in air to the oxide.

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Thorium - Wikipedia Thorium is a weakly radioactive metallic chemical element with symbol Th and atomic number 90. Thorium is silvery and tarnishes black when it is exposed to air, forming thorium dioxide; it is moderately hard, malleable, and has a high melting point.Thorium is an electropositive actinide whose chemistry is dominated by the +4 oxidation state; it is quite reactive and can ignite in air when.

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Isotopes of thorium - Wikipedia Although thorium (90 Th) has 6 naturally occurring isotopes, none of these isotopes are stable; however, one isotope, 232 Th, is relatively stable, with a half-life of 1.405×10 10 years, considerably longer than the age of the Earth, and even slightly longer than the generally accepted age of the universe.This isotope makes up nearly all natural thorium.

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Nan Madol – Wikipedia Nan Madol ist eine Ruinenstadt vor Temwen Island, einer Nebeninsel von Pohnpei im Archipel der Karolinen (politisch Föderierte Staaten von Mikronesien).Sie wurde auf 92 künstlich angelegten, im Mittel fußballfeldgroßen Inseln auf einem Korallenriff errichtet. Nan Madol war keine Stadt im heutigen Sinne, sondern primär ein abgegrenztes Ritualzentrum und Wohnstätte einer politisch.

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Uranium-238 | chemical isotope | Britannica.com Other articles where Uranium-238 is discussed: breeder reactor: …a breeder reactor employs either uranium-238 or thorium, of which sizable quantities are available. Uranium-238, for example, accounts for more than 99 percent of all naturally occurring uranium. In breeders, approximately 70 percent of this isotope can be utilized for power production.

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C14-datering - Wikipedia C14-datering of koolstofdatering is een methode van radiometrische datering waarmee de ouderdom van organisch materiaal en ecofacten wordt bepaald met behulp van de isotoop koolstof-14.Koolstof-14 (14 C) is een isotoop van koolstof die in onze atmosfeer uit stikstofkernen gevormd wordt.Dit gebeurt door kernreacties ten gevolge van de kosmische straling waaraan de aarde voortdurend blootstaat.