Groundwater age dating using tritium Freeswingerschatsites
For reference see this primer in a previous blog post.
Name: Carbon-14 Nickname: 14C, The Cool One Personality: Bada^s, Awesome Half-life: 5730 years Groundwater age range: 100 -100,000 years A little about me: 14C, nicknamed radiocarbon, is the isotope that everyone wants to meet.
Therefore, when I say groundwater is one year old, this means that it was likely rain from last year that has now reached the well, but it may be slightly older when you factor in the vadose zone travel time.
Are you ready to meet your speed dating contestants!?
You won’t see them in Twins magazine (twinsmagazine.com).
The source of 85Kr is low level emissions from the nuclear industry, mainly fuel reprocessing.
There are other reasons that it is beneficial to know the age of groundwater and if you’re interested I refer you to some of the references below.
In today’s post I introduce you to a motley crew of isotopes and chemicals that hydrogeologists and geochemists use to date the age of groundwater.Pumping could draw more water into the aquifer from recharge (not always an option) to replace what is lost, the water pumped could be from groundwater already stored in the aquifer, or it could be groundwater that was leaving the aquifer via discharge into a river or lake that is now diverted to your well.Another great reason to know the groundwater age is to assess the vulnerability of an aquifer to contamination.Name: Krypton 85 and Krypton 81 Nickname: 85Kr and 81Kr, The Twins Personality: Different, One short tempered, the other slow to anger Half-life: 81Kr: 10.75 years, 85Kr: 230,000 Groundwater age range: 10 – 100 and 10,000 -1,000,000 years (using different Kr isotopes) A little about me: These two twins could not be more different.
Both are isotopes of krypton but with hugely different applications.Pick the one that you’d like to date (the best isotope for your particular groundwater sample).