Fukushima’s nuclear signature found in California wine
A similar example of how sensitive measurement tools are:  wine from the Livermore area is slightly higher in tritium than wine from elsewhere in California, ostensibly because of proximity to LLNL.<p><a href="https://books.google.com/books?id=nAgxAQAAMAAJ&pg=RA2-PA63&lpg=RA2-PA63&source=bl&ots=sy0Cj7lW5m&sig=_m7VUqXXDDmYTdRGV_r4ZJmsWuE&hl=en&sa=X&ved=0ahUKEwiBk6eJ167cAhXSGDQIHUpPDBAQ6AEIhAEwCQ#v=onepage" rel="nofollow">https://books.google.com/books?id=nAgxAQAAMAAJ&pg=RA2-PA63&l...</a>