Carbon-14 was discovered on February 27, 1940, by Martin Kamen and Sam Ruben at the University of California Radiation Laboratory in Berkeley, California.
Its existence had been suggested by Franz Kurie in 1934. The primary natural source of carbon-14 on Earth is cosmic ray action on nitrogen in the atmosphere, and it is therefore a cosmogenic nuclide.
All of my instructors were well educated and informed in this area of health care and have been very excited to share their knowledge and experiences with the students.
The UPV/EHU has developed the Datink method that determines the age of a document in a less invasive way than other techniques and is also able to date documents up to five years old.
So Datink has overcome some of the drawbacks graphology examination comes up against when ascertaining the age of a document by means of other methods.
Nevertheless, this methodology is a pilot experience that requires further in-depth research when it comes to evaluating the limits of the applicability of the various inks and makes of ballpoint pens, thus reducing its potential limitations.To do this, they used BIC ballpoint pens, one of the most common makes and, therefore, the most widely used in documents subjected to legal examination.Each document was produced at different moments using a different ink stroke pressure, factors that may alter the results and lead to dating errors.As Luis Bartolomé pointed out, "what is interesting about this method is that it can more accurately determine the age of the stroke produced by the ballpoint pen.That is why it is very useful for documents that have been signed as it is possible to compare whether the body of the document, if it has been written by hand, is as old as the signature.
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Likewise, the team that has developed this new method has managed to obtain results using minimal amounts taken from the document.