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Though the Rb and Sr concentrations differ, it’s safe to assume that the isotopic makeup of Sr and of Rb is the same everywhere.This is the key to figuring out how much time has passed since the rock solidified.The radioactive isotope carbon-14 is created in the upper atmosphere when cosmic-ray particles from outer space strike nitrogen atoms and transform them into radioactive carbon.
Let’s go through an example of calculating the age of a rock with the radioactive nuclide Rubidium-87 (Rb87).This imaging technique builds up a highly detailed picture by taking x-ray images from different angles to give a series of image cross sections (or slices) through the part of the body being scanned.Radiotherapy – is the use of ionising radiation to treat cancer.The prodigious mobilization of science that produced nuclear weapons was so far-reaching that it revolutionized even the study of ancient climates.Nuclear laboratories, awash with funds and prestige, spun off the discovery of an amazing new technique radiocarbon dating.
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X-rays – are the most common form of ionising radiation used in medicine.