What is Beryllium-10?
'''Beryllium-10''' (<sup>10</sup>Be) is a [[radioisotope]] of [[beryllium]]. It is formed in the [[Earth's atmosphere]] mainly by [[cosmic ray spallation]] of [[nitrogen]] and [[oxygen]].<ref>{{Cite journal|last1=Kovaltsov|first1=Gennady A.|last2=Usoskin|first2=Ilya G.|date=2010|title=A new 3D numerical model of cosmogenic nuclide 10Be production in the atmosphere|url=https://linkinghub.elsevier.com/retrieve/pii/S0012821X10000300|journal=Earth and Planetary Science Letters|language=en|volume=291|issue=1–4|pages=182–188|doi=10.1016/j.epsl.2010.01.011|bibcode=2010E&PSL.291..182K|via=}}</ref><ref>{{Cite book|last1=Beer|first1=Jürg|last2=McCracken|first2=Ken|last3=von Steiger|first3=Rudolf|date=2012|title=Cosmogenic Radionuclides|url=https://link.springer.com/book/10.1007%2F978-3-642-14651-0|journal=Physics of Earth and Space Environments|language=en-gb|doi=10.1007/978-3-642-14651-0|bibcode=2012crta.book.....B|isbn=978-3-642-14650-3|s2cid=55739885|issn=1610-1677}}</ref><ref>{{Cite journal|last1=Poluianov|first1=S. V.|last2=Kovaltsov|first2=G. A.|last3=Mishev|first3=A. L.|last4=Usoskin|first4=I. G.|date=2016-07-16|title=Production of cosmogenic isotopes 7 Be, 10 Be, 14 C, 22 Na, and 36 Cl in the atmosphere: Altitudinal profiles of yield functions: COSMOGENIC ISOTOPES IN THE ATMOSPHERE|url=http://doi.wiley.com/10.1002/2016JD025034|journal=Journal of Geophysical Research: Atmospheres|language=en|volume=121|issue=13|pages=8125–8136|doi=10.1002/2016JD025034|arxiv=1606.05899|s2cid=119301845}}{{Dead link|date=January 2022 |bot=InternetArchiveBot |fix-attempted=yes }}</ref> Beryllium-10 has a [[Half-life (element)|half-life]] of 1.39 × 10<sup>6</sup> years. It [[Radioactive decay|decays]] by [[beta decay]] to [[boron-10]]. It has a maximum energy of 556.2 keV. It decays through the reaction <sup>10</sup>Be→<sup>10</sup>B + e<sup>−</sup>.<ref>{{Cite journal|last1=Korschinek|first1=G.|last2=Bergmaier|first2=A.|last3=Faestermann|first3=T.|last4=Gerstmann|first4=U. C.|last5=Knie|first5=K.|last6=Rugel|first6=G.|last7=Wallner|firs