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The decay series of most interest to geologists are those with half-lives of tens, hundreds or thousands of millions of years.If the proportions of parent and daughter isotopes of these decay series can be measured, periods of geological time in millions to thousands of millions of years can be calculated.The amount of argon measured is therefore commonly less than the total amount produced by the radioactive decay of potassium.This results in an underestimate of the age of the rock.

Up to this time estimates of the age of the Earth had been based on assumptions about rates of evolution, rates of deposition, the thermal behaviour of the Earth and the Sun or interpretation of religious scriptures.

A number of elements have isotopes (forms of the element that have different atomic masses) that are unstable and change by radioactive decay to the isotope of a different element.

Each radioactive decay series takes a characteristic length of time known as the radioactive half-life, which is the time taken for half of the original (parent) isotope to decay to the new (daughter) isotope.

Measurement of the concentrations of different isotopes is carried out with a mass spectrometer.

In these instruments a small amount (micrograms) of the sample is heated in a vacuum to ionise the isotopes and these charged particles are then accelerated along a tube in a vacuum by a potential difference.




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These coastal low tide orthophotographies (different from those presented on the Geoportail french national geoportal) covering all the Atlantic and Channel French littoral area represents 31.34 Gb of Mr Sid compressed image data (322 Gb in Geo TIFF format)from Brest Metropole Oceane : tiles originally in Lambert I / NGF (jpeg format) available under Creatice Commons license (Brest Moulin Blanc Harbour with Oceanopolis, aerial photo realized in september 2004 -resolution : 20 cm-) data from SHOM : French aerial photos of the French Atlantic (252 pictures from Spanish border to Saint Malo) and Mediterranean (648 pictures) coasts (GE markers with direct hyperlinks to French Hydrographic Service website which sells these photos in high resolution -30 x 40 cm or 40 x 50 cm format-) data from Francecoastline (2006) : about 15000 French aerial photos of the all the French coasts (Channel, Atlantic and Medterranean) (GE markers with direct hyperlinks to Pascal Le Fichant website which sells these photos in high resolution - 45 x 30 cm or 30 x 20 cm professional quality paper-) data from 1yachtua : Mediterranean nautical charts including different scales maps (Port Monaco 000 / Menton 1 : 20000) originally in GIF format, Mercator projection / ED50, manually georeferenced The original chart has been cut horizontally in several pieces to keep its original resolution in GE v.3 because of the size of the raster chart leading to significant slowdowns : waiting a possible implementation in Google Earth of ISO-standard JPEG2000 image compression format storing geo-location metadata (using for example some KMLJP2 implementation such as GMLJP2 Open GIS GML grammar...)About 1018 NOAA raster nautical charts (RNC/BSB/KAP format) stored in the Geo Garage can be viewed online with Google Maps (public access) or Google Earth (private access) with advanced quilting process (mosaic image with removed borders -map collars- for a seamless rendering display of multiple charts).


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