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!?
See me previous post on atom trap trace analysis for the details on this method that has made 81Kr dating possible.
81Kr is produced by cosmic ray interactions with gases in the atmosphere that become incorporated into rain that can recharge groundwater.
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.
After meeting all of the contestants it will be up to you to pick your favourite and perhaps propose a second date. Before I introduce you to our contestants I should briefly make it clear why groundwater dating is important.
Both are isotopes of krypton but with hugely different applications.
Nevertheless, they may be worth a longer look in your future?
Name: Tritium Nickname: 3H, The Friendly One Personality: Popular, Nice Half-life: 12.3 years Groundwater age range: 10-100 years A little about me: Tritium is the popular isotope in groundwater dating.
For example, pumping an aquifer with a groundwater age of 10 years can be done semi-sustainably as any water extracted will take ~10 years to replace.
However, pumping water with an age of 100,000 years is exploiting a nearly non-renewable resource.