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The radioactive isotope measured in carbon dating is carbon-14, which is produced when cosmic rays act on nitrogen in the upper atmosphere.Only one in every 850,000,000 carbon atoms are carbon-14, but they are easily detected.This means that if we find tissue that has 25% of the amount of carbon-14 found in today’s atmosphere, we can determine the object is 11,460 years old because 25% is half and half again, meaning that the object has experienced two half lives.
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A particle of beta radiation can cause spontaneous mutation and cancer when it comes into contact with DNA.This can occur because light travels at roughly 75% its typical speed when in water and beta radiation can, therefore, exceed this speed without breaking the speed of light.
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