61. A Radiometric Dating Resource List - Large Annotated Directory Of Internet Resou Geochronology Working Group at Vienna University (Popularity ) Uses radiometric dating and classical geochronological methods to constrain the timing of http://www.sciencecentral.com/site/505791

Thursday, 24 January, 2008 Home Submit Science Site Add to Favorite Contact search for Directories Aeronautics and Aerospace Agriculture Anomalies and Alternative Science Astronomy ... Technology Category: Science Earth Sciences Geology Geochronology ... REPORT BROKEN LINK A Radiometric Dating Resource List Popularity: Details document.write(''); Large annotated directory of internet resources on radiocarbon and other radioactive dating methods, including creationists' views and scientific critiques of those views. URL Title A Radiometric Dating Resource List Description Category: Related sites Geological Time (Popularity: ): Lecture notes on different methods of measuring geologic time. Geologic Time (Popularity: ): USGS on-line publication about the relative and radiometric geologic time scales, age of the earth, ... Berkeley Geochronology Center (Popularity: ): Non-profit scientific research institution dedicated to establishing the history of the Earth, its various inhabitants, ... Web Time Machine (Popularity: ): Geologic time scale with links for each time interval. Geochronology Working Group at Vienna University (Popularity: ): Uses radiometric dating and classical geochronological methods to constrain the timing of geological processes, primarily ...

62. Direct Radiometric Dating Of Hydrocarbon Deposits Using Rhenium-Osmium Isotopes Direct radiometric dating of Hydrocarbon Deposits Using RheniumOsmium Isotopes. David Selby1,2* and Robert A. Creaser1. Rhenium-osmium (Re-Os) data from http://www.sciencemag.org/cgi/content/abstract/308/5726/1293

Jump to: Page Content Section Navigation Site Navigation Site Search ... Account Information , or Site Tools Note to users. If you're seeing this message, it means that your browser cannot find this page's style/presentation instructions or possibly that you are using a browser that does not support current Web standards. Find out more about why this message is appearing, and what you can do to make your experience of our site the best it can be. Site Tools Site Search Site Area Science Magazine Daily News Science Signaling SAGE KE Science Careers All HighWire Journals Terms Advanced Account Information Guest Alerts Access Rights My Account Sign In Site Navigation Readers Members Authors Librarians Advertisers Current Issue Previous Issues Science Express ... 27 May 2005 Article Views Abstract Full Text (HTML) Full Text (PDF) Supporting Online Material Article Tools Save to My Folders Download Citation Alert Me When Article is Cited Post to CiteULike ... View PubMed Citation Related Content In Science Magazine Science Perspectives by Schaefer More Information on Related Content Similar Articles In: Science Magazine ISI Web of Science PubMed Search Google Scholar for: Articles by Selby, D.

63. Early Primate Evolution:  Isotopes Commonly Used For Radiometric Dating Isotopes Commonly used for radiometric dating Dating Sample, Key Fission Product. Lutetium176, Hafnium-176, 37.8 billion, early Earth http://anthro.palomar.edu/time/table_of_isotopes.htm

Isotopes Commonly used for Radiometric Dating Isotopes Half-life (years) Effective Dating Range (years) Dating Sample Key Fission Product Lutetium-176 Hafnium-176 37.8 billion early Earth Uranium-238 Lead-206 billion 10 million to origin of Earth Uranium-235 Lead-207 m illion 10 million to origin of Earth Rubidium-87 Strontium-87 48.8 billion 10 million to origin of Earth Potassium-40 Argon-40 billion 100,000 to origin of Earth Carbon-14 Nitrogen-14 Note: the half-life durations listed in the text sections of this tutorial are rounded off for uranium-238 and potassium-40. Return to Menu This page was last updated on Friday, July 01, 2005 by Dennis O'Neil. All rights reserved.

64. Radiometric Dating In Geology. Identifiers, Carbon 14 Dating; Geochronology; radiometric dating. Record Type, Journal. Level, N/A. Institutions, N/A. Sponsors, N/A http://www.eric.ed.gov/ERICWebPortal/recordDetail?accno=EJ237390

65. Scientists & Discovery, Radiometirc Dating, Museum Victoria, Australia. This process is called radiometric or radioactive dating. radiometric dating is possible because the radioactive decay of large numbers of radioactive atoms http://museumvictoria.com.au/scidiscovery/radioactivity/radio_dating.asp

If the size of the text in this page is too small, please either turn javascript on or adjust the default text size of your browser. MUSEUM VICTORIA MELBOURNE MUSEUM SCIENCEWORKS IMMIGRATION MUSEUM ... Radioactive Decay Radiometric Dating Applications of Radiation What is Radiation? Radioactivity Radiometric Dating ... printer friendly page Radiometric Dating Radioactive decay allows geologists and physicists to measure the age of ancient fossils, rocks and even the Earth. This process is called radiometric or radioactive dating. Radiometric dating is possible because the radioactive decay of large numbers of radioactive atoms follows a predictable pattern. This predictability allows scientists to measure the age of an object if they can work out how many radioactive atoms were originally present. Two situations where we can do this involve Potassium-40 atoms and Carbon-14 atoms. All radioactive atoms decay to become a more stable kind of atom. The original radioactive atom is known as a parent isotope, while the atom produced by the decay process is known as a daughter isotope. Isotopes are different forms of the same element. For example Uranium-235 and Uranium-238 are both Uranium atoms with the same number of protons, but they have a different number of neutrons. The number used to identify the isotope refers to the total number of particles in the nucleus of each atom.

66. First Direct Radiometric Dating Of Archaean Stromatolitic Limestone First direct radiometric dating of Archaean stromatolitic limestone. S. Moorbath*, P. N. Taylor*, J. L. Orpen†, P. Treloar‡§ J. F. Wilson† http://www.nature.com/nature/journal/v326/n6116/abs/326865a0.html

nature.com about npg news@nature.com naturejobs ... register SEARCH JOURNAL Journal Home Current Issue AOP Archive THIS ARTICLE Download PDF References Export citation Export references ... Table of Contents Nature , 865 - 867 (30 April 1987); doi:10.1038/326865a0 First direct radiometric dating of Archaean stromatolitic limestone S. Moorbath , P. N. Taylor , J. L. Orpen , P. Treloar Department of Earth Sciences, Oxford University, Parks Road, Oxford OX1 3PR, UK Geology Department, University of Zimbabwe, PO Box MP 167, Mount Pleasant, Harare, Zimbabwe Department of Geology and Physical Sciences, Oxford Polytechnic, Headington, Oxford OX3 0BP, UK Present address: Geology Department, Imperial College, Prince Consort Road, London SW7 2AZ, UK. Here we report the first direct dating of the depositional age of a sedimentary carbonate rock using long-lived radioactive decay schemes. The Mushandike stromatolitic limestone, from the Masvingo (formerly Fort Victoria) greenstone belt of southern Zimbabwe , yields a Pb/Pb isochron age of 2,839 33 Myr. Published claims

67. Radiometric Dating: Radioactive Carbon, Potassium Argon, Uranium Lead of three radioactive dating methods and their flaws. Radioactive Carbon, Potassium Argon and Uranium Lead methods are explained....... http://www.eadshome.com/RadiometricDating.htm

Updated: Monday, February 19, 2007 home "In the beginning..." Creation vs. Evolution How old is the earth? ... What about transitional forms? Radiometric Dating explained Overview of Radiometric Dating: There is no instrument available to measure the age of any substance. We can examine a rock, measure its composition and ratio of various elements, but we can never get a direct age. We must make assumptions based upon the chemical and mineral composition of a specimen before we can draw a conclusion about its age. These assumptions Uranium-Lead Dating: This dating method is used primarily on igneous rocks and is used to date objects thought to be quite old. Uranium-238 has a half-life of about 4.5 billion years. This means that if we could watch a sample of U-238 for 4.5 billion years, we would note that half of it would be gone, having decayed to Lead [Pb]-206. U-Pb dating is based upon three assumptions: 1) A constant decay rate this is a reasonable assumption based upon observed physical properties. 2) No loss or gain of Uranium or Lead during the "life" of the rock.To avoid this problem, paleontologists choose specimes that appear to have no erosion forces acting on it. This is difficult to objectively guarantee, but it is nonetheless a reasonable assumption.

68. IngentaConnect Radiometric Dating Of Sediment Cores From A radiometric dating of sediment cores from a hydrothermal vent zone off Milos Island in the Aegean Sea. Authors Ugur A.1; Miquel J.C.; Fowler S.W.; http://www.ingentaconnect.com/content/els/00489697/2003/00000307/00000001/art005

69. Problems With Radiometric And Genetic Dating Methods Other types of radiometric dating (potassium argon, uranium, etc.) are based on similar assumptions of a known amount of element and isotope at the time of http://www.scripturehistory.com/problemsradiometricgeneticdating.php

ScriptureHistory.com The Global Genesis Flood Atlantis in History, Tradition, and Scripture Astrophysics' Black Box: The New Shamanism: ... Lost in Translation Visit page The Global Genesis Flood Atlantis in History, Tradition, and Scripture The New Shamanism: Astrophysics' Black Box Reconsidering Book of Mormon Geography Problems with Radiometric and Genetic Dating Chronology of the World The Myth of Scientific Objectivity The Religion of Science Lost in Translation Problems with Radiometric and Genetic Dating Methods: Assumption, Preconception, Collusion, and Circular Logic David Stewart, Jr. Assumptions of Radiometric Dating Radiometric and genetic dating methods are often claimed to be accurate, unbiased, and rigorously scientific tools for determining the age of fossils, rocks, and human remains. However, like all methodological tools, results of such dating methods are valid only when their assumptions are met. In “Radiocarbon Dating: Tool or Magic Wand, Robert F. Helfinstine describes the assumptions of radiocarbon dating: The assumptions in which the [radiocarbon] dating is made are: 1. It is independent of time for 70,000 years.

70. Determining Absolute Ages By Radiometric Dating Determining Absolute Ages by radiometric dating. 1. radiometric datingMeasuring the passage of time by the regular rate of decay of radioactive isotopes. http://www.csmate.colostate.edu/cltw/cohortpages/viney/radiod.html

Determining Absolute Ages by Radiometric Dating Radiometric Dating -Measuring the passage of time by the regular rate of decay of radioactive isotopes. Isotopes -Same element, but different number of neutrons. There are 350 different isotopes. Some isotopes are stable and others are radioactive. Parent Isotope -Radioactive isotope incorporated during crystal formation. Daughter Isotope -Stable decay product of parent isotope. Radioactive isotopes decay or change into a stable element at an exponential rate that does not change. The decay rate is not affected by heat, temperature, pressure, or chemical reactions. Half-life -The time it takes for half of the parent sample to decay to the stable daughter isotope. Examples: a. U-238 to Pb-206 (4.5 billion years) b. U-235 to Pb-207 (704 million years) c. K-40 to Ar-40 (1.3 billion years) d. C-14 to N-14 (5,730 years) Potassium-40 decays to Argon-40. Use the following numbers to make a graph of Potassium-40 decay. Millions of years will be on the x-axis and the percent of potassium-40 will be on the y-axis. Data: (0 years, 100%), (1,300 million years, 50%), (2,600 million years, 25%), (3,900 million years, 12.5%), (5,200 million years, 6.25%). Make a best-fit curve for these numbers. Title and label your graph. You will use this graph to age date some rock sequences from the previous geologic cross sections. Back to History of Life or The Atomic Nucleus

71. Index-english This laboratory at the University of Kiel provides radiometric dating and studies the use of stable and radioactive isotopes for archaeometry, http://www.uni-kiel.de/leibniz/Leibniz-web_englisch/index-english.htm

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72. Radiometric Dating - Conservapedia radiometric dating is a method of determining the age of an artifact by measuring the amount of radioactive decay that has occurred. 1 radiometric dating http://www.conservapedia.com/Radiometric_dating

Radiometric dating From Conservapedia Jump to: navigation search Radiometric dating is a method of determining the age of an artifact by measuring the amount of radioactive decay that has occurred. Radiocarbon dating F t e k t Contents Principles Key assumptions Initial quantities Rate of decay ... edit Principles No method exists for measuring time , except by measuring it as it is passing. Therefore, the age of an artifact must be calculated The basic principle in any dating method is to find a process that is occurring at a measurable rate and which is causing a change, measure the rate of that process, work out what state the artifact was in at the beginning of the process, observe what state it is in now, and to calculate how long the process at the measured rate would need to occur to effect that change. For example, to work out how long a candle has been burning, the following steps would be needed: Measure how long it takes the candle to burn down a given amount. Find out how long the candle was when it started burning. Measure how long the candle is now.

73. YouTube - Re: The Creationist Challenge Radiometric Dating SINCE radiometric dating is DEPENDANT on the CONSTANCY of each isotopes halflife, and you have EXPLICITLY referenced the FEASIBILITY of radiometric dating http://www.youtube.com/watch?v=D5J9zm-ykUo&feature=related

74. Radiometric Dating Methods For example Carbon 14 is often the method of choice for scientists dating organic artifacts like wood, charcoal, bone, and teeth that are less than about http://www.geocraft.com/WVFossils/DatingMethods.html

HOW OLD IS IT? The absolute age of a wide variety of rocks, fossils, and human artifacts can be determined by various laboratory procedures. Deciding which test to perform depends on the composition and believed approximate age of a particular specimen. For example Carbon 14 is often the method of choice for scientists dating organic artifacts like wood, charcoal, bone, and teeth that are less than about 40,000 years. Carbon 14 as an isotope exists in Earth's atmosphere at more or less constant concentrations relative to other carbon isotopes (there are exceptions, which published tables compensate for). When living tissue dies the Carbon 14 begins to slowly decay. Carbon 14 has a half-life of about 5,370 years , meaning that every 5,370 years about 50% of it decays to it's daughter product , the Carbon 12 isotope. After another 5,370 years only 25% of it remains, and so on. After 40,000 years there isn't enough of it left to accurately measure, so to date anything much older requires use of one or more of the other age-determination methods. The Carbon 14 test would be inappropriate for something like, say, granite because what we already know about granite is that it is too old and of the wrong composition for that test. But the granite may very well contain traces of the elements Uranium, Rubidium, or Potassium, and a test using one or more of those isotope procedures may well be appropriate and yield good results.

75. Eduardo - Re: Radiometric Dating Resource List Link Fix Re radiometric dating Resource List link fix (Andy™). Honestly, I am fully aware of being a loud mouthed, damn it, mostly drunken ranter. http://www.scienceagogo.com/message_board3/messages/135.shtml

Re: Radiometric Dating Resource List link fix Posted by Eduardo on Nov 14, 2002 at 20:30 Re: Radiometric Dating Resource List link fix (Andy™) Honestly, I am fully aware of being a loud mouthed, damn it, mostly drunken ranter. But, BUT, whenever I have put a (not even very carefully thought out) question to Anyman or Sparrow they have studiously managed to ignore it, disappear for a bit and then come back as if nothing had happened. And frankly it's getting on my tits. Please, I implore you, get anyman/sparrow to stake there case for a 6000 year old Earth, then let me at them. Follow Ups: Re: Radiometric Dating Resource List link fix Andy™ Re: Radiometric Dating Resource List link fix Eduardo Re: Radiometric Dating Resource List link fix Eduardo Linguistic Mutilation Lesson #101 Amaranth Rose Re: Linguistic Mutilation Lesson #101 Eduardo Re: Linguistic Mutilation Lesson #101 Andy™ Re: Linguistic Mutilation Lesson #101 Amaranth Rose Re: Linguistic Mutilation Lesson #101 Eduardo Re: Linguistic Mutilation Lesson #101 Amaranth Rose Re: Linguistic Mutilation Lesson #101 Eduardo Re: Linguistic Mutilation Lesson #101 Amaranth Rose Re: Linguistic Mutilation Lesson #101 Eduardo Re: Linguistic Mutilation Lesson #101 Amaranth Rose Re: Linguistic Mutilation Lesson #101 Eduardo Re: Linguistic Mutilation Lesson #101 Amaranth Rose Re: Linguistic Mutilation Lesson #101 Eduardo Re: Linguistic Mutilation Lesson #101 Eduardo Re: Linguistic Mutilation Lesson #101 Amaranth Rose Re: Linguistic Mutilation Lesson #101 Eduardo Wintry Weather Amaranth Rose

76. Welcome To Virtual Age - Dating Virtual dating contains two options as well as a demonstration version. System and technical requirements for Virtual dating http://www.sciencecourseware.org/VirtualDating/

Sorry, but you're not likely to find that special someone here, because this is an interactive exercise about Geologic Time . Here you'll learn how geologists and archeologists determine the ages of rocks and ancient artifacts. Please be patient as Java applets and associated images load into your computer. Your comments are welcome. Contact Us Virtual Dating contains two options as well as a demonstration version. document.writeln('Virtual Dating Isochron for rocks and minerals'); document.writeln('Virtual Dating Radiocarbon (Carbon-14)'); document.writeln('Virtual Dating Demo If you just want to do a quick run-through of the activity, try the "Demo" version answer checking and other feedbacks are not implemented.'); You must have JavaScript turned on in your browser to use VirtualDating. System and technical requirements for Virtual Dating Javascript is not enabled

77. Potassium-Argon Dating PotassiumArgon dating Potassium-Argon dating is the only viable technique for dating very old archaeological materials. Geologists have used this method to http://id-archserve.ucsb.edu/Anth3/Courseware/Chronology/09_Potassium_Argon_Dati

Chronological Methods 9 - Potassium-Argon Dating http://id-archserve.ucsb.edu/Anth3/Courseware/Chronology/09_Potassium_Argon_Dating.html Potassium-Argon Dating Potassium-Argon dating is the only viable technique for dating very old archaeological materials. Geologists have used this method to date rocks as much as 4 billion years old. 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). By comparing the proportion of K-40 to Ar-40 in a sample of volcanic rock, and knowing the decay rate of K-40, the date that the rock formed can be determined. How Does the Reaction Work? Potassium (K) is one of the most abundant elements in the Earth's crust (2.4% by mass). One out of every 10,000 Potassium atoms is radioactive Potassium-40 (K-40). These each have 19 protons and 21 neutrons in their nucleus. If one of these protons is hit by a beta particle, it can be converted into a neutron. With 18 protons and 22 neutrons, the atom has become Argon-40 (Ar-40), an inert gas. For every 100 K-40 atoms that decay, 11 become Ar-40. How is the Atomic Clock Set?

78. Dating Exhibit dating techniques tend to be very important to archaeologists. Absolute dating is a way to get the date of something in the most accurate way possible. http://www.mnsu.edu/emuseum/archaeology/dating/absolutedat.html

Archaeomagnetism Astronomical Dating Dendochronology Fission Track ... Uranium-Thorium Dating Dating techniques tend to be very important to archaeologists. Absolute dating is a way to get the date of something in the most accurate way possible. Absolute dating which is also known as chronometrical dating has techniques that include: dendrochronology (study of tree ring patterns), Archaeomagnetism (based on fact that changes in the earth's magnetic field over time can be recorded as remnant magnetism in certain materials, e.g., baked clay), and radioactive dating such as radiocarbon/C-14 thermoluminescence , and potassium argon . These latter techniques are based on the principles of radioactive decay, the process by which radioactive isotopes break down into their decay products with a half-life specific to the isotope in question. Half life refers to the time taken for half the quantity of a radioactive isotope in a sample to decay. Carbon-14 Nitrogen-14 Potassium-40 Argon-40 Uranium-235 Lead-207 Uranium-238 Lead-206 Thorium-232 Lead-208 Rubidium-87 Strontium-87 There are many ways in which the absolute date of something can be achieved. Some of those methods are tree growth rings, coral growth cycles, and varves (annual clay sediment layers). These methods rely on the decay of the naturally occurring radiogenic isotopes shown in the table to the right.

79. Radioactive Dating Certain radioactive lelments decay a predictable rates and may be used to date earth rocks and minerals. http://earthsci.org/fossils/geotime/radate/radate.html

Home To the main page of Earth Science Australia - no advertising, no spyware Freeware Free downloads of earth science software ... listen to classical music from a new window while you browse radioactive dating Radioactive Isotopes - the "Clocks in Rocks" Numerical and Relative Ages for Rocks Geological time... Parent Decay and Daughter Growth Curves Radiocarbon Dating Dating Rocks with the Rb-Sr "Isochron" Method ... A Mass Spectrometer is used to Measure Isotopic Ratios A numerical (or "absolute") age is a specific number of years, like 150 million years ago. A relative age simply states whether one rock formation is older or younger than another formation. The Geologic Time Scale was originally laid out using relative dating principles. Numerical dating, the focus of this exercise, takes advantage of the "clocks in rocks" - radioactive isotopes ("parents") that spontaneously decay to form new isotopes ("daughters") while releasing energy. For example, decay of the parent isotope Rb-87 (Rubidium) produces a stable daughter isotope, Sr-87 (Strontium), while releasing a beta particle (an electron from the nucleus). ("87" is the atomic mass number = protons + neutrons. Numerical ages have been added to the Geologic Time Scale since the advent of radioactive age-dating techniques.

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