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5/F South Block Tower C, Raycom Info Tech Park No.2 Ke Xue Yuan South Road, Haidian District, Beijing 100190 China Tel: ( 86) 010 5982 2196 Tel: 4000-365-965 (Applicable within Mainland China only) Fax: 86 (10) 5982 2588 Email: [email protected] of Operation: AM - PM CST (Mon-Fri) Chikyu Kagaku Kenkyusho Corp.1-608 Ueda-Honmachi Tenpaku-ku Nagoya 468-0007 Japan Tel: ( 81) Fax: ( 81) Email: [email protected] of Operation: 9 AM - 6 PM JST (Mon-Fri)Beta Analytic Inc.Usually a proton is knocked out of the nitrogen atom's nucleus and is replaced with the neutron.The proton takes an electron with it and becomes an atom of hydrogen.When they strike ordinary atoms in the upper atmosphere, the cosmic rays smash them apart. Some of these neutrons then collide with nitrogen atoms.This collision is less destructive than the initial collision that produced them.
This atom is not stable, and will break down, releasing nuclear energy in the process.
Beta's AMS dating standard service reports results in 14 business days or less. Contact us for shipping instructions for your region before sending your samples. IMPORTANT: The laboratory does not undertake the dating of manuscripts, objects of art or other valuable or priceless items unless they are submitted and paid for by a recognized governmental agency, major museum, or other official agency that is investigating the materials as part of multidisciplinary scholarly process.
As a tracer-free lab, Beta Analytic does not accept samples with "tracer Carbon-14" or any materials that have been artificially enhanced with Carbon-12, Carbon-13, Carbon-14 or any other isotope to eliminate the risk of cross-contamination. Avenida das Nações Unidas, nº 12.551 - 9º andar Cep: 04578-000 - São Paulo Brazil Tel: 55 (21) 39585790 Fax: ( 55) 11-3443-7401 Email: [email protected] of Operation: AM - 6 PM BRT (Mon-Fri)Beta Analytic Inc.
But in actual practice, we know neither the original ratios nor if the specimen has been contaminated and are forced to make what we hope are reasonable assumptions.
The tiny initial amount of C14, the relatively rapid rate of decay (the half-life of C14 is currently about 5700 years) and the ease with which samples can become contaminated make radiocarbon dating results for samples "older" than about 50,000 years effectively meaningless.
The carbon dioxide is absorbed by plants, and the plants are eaten by animals, thus contaminating every living thing on earth with radioactive carbon. As time passes, the C14 in its tissues is converted back into nitrogen.