{"id":136,"date":"2026-04-10T02:53:10","date_gmt":"2026-04-10T02:53:10","guid":{"rendered":"https:\/\/books.gw-project.org\/age-dating-young-groundwater\/chapter\/ch057-xhtml\/"},"modified":"2026-05-12T01:57:04","modified_gmt":"2026-05-12T01:57:04","slug":"exercise-4","status":"publish","type":"chapter","link":"https:\/\/books.gw-project.org\/age-dating-young-groundwater\/chapter\/exercise-4\/","title":{"raw":"Exercise\u00a04","rendered":"Exercise\u00a04"},"content":{"raw":"
\r\n
\r\n\r\nA times series of [latex]_{}^{3}H[\/latex] values in precipitation from Lincoln, Nebraska, USA, (Michel et al., 2018) is available and a groundwater sample collected in 2012 has a measured tritium concentration of 4.5\u00a0TU. In the spreadsheet provided on the web page for this book<\/span><\/a>\u2197, annual [latex]_{}^{3}H[\/latex] has been determined as an unweighted mean value (annual mean) and a weighted mean based on monthly precipitation from Lincoln,\u00a0Nebraska,\u00a0USA<\/span><\/a>\u2197.\r\n\r\n<\/div>\r\n
\r\n\r\nConstruct a decay curve and answer the following questions:\r\n\r\n<\/div>\r\n
    \r\n \t
  1. What is the minimum groundwater age for this sample, based on Equation\u00a0(13)<\/span><\/a>?<\/li>\r\n \t
  2. Compare the answer above to the minimum age determined using a graphical method.<\/li>\r\n<\/ol>\r\n
    \r\n\r\nSolution to Exercise\u00a04<\/u><\/span><\/a>\u2ba7\r\n\r\n<\/div>\r\n
    \r\n\r\nReturn to where text linked to Exercise\u00a04<\/u>\u2ba5<\/span><\/a>\r\n\r\n<\/div>\r\n<\/div>","rendered":"
    \n
    \n

    A times series of [latex]_{}^{3}H[\/latex] values in precipitation from Lincoln, Nebraska, USA, (Michel et al., 2018) is available and a groundwater sample collected in 2012 has a measured tritium concentration of 4.5\u00a0TU. In the spreadsheet provided on the web page for this book<\/span><\/a>\u2197, annual [latex]_{}^{3}H[\/latex] has been determined as an unweighted mean value (annual mean) and a weighted mean based on monthly precipitation from Lincoln,\u00a0Nebraska,\u00a0USA<\/span><\/a>\u2197.<\/p>\n<\/div>\n

    \n

    Construct a decay curve and answer the following questions:<\/p>\n<\/div>\n

      \n
    1. What is the minimum groundwater age for this sample, based on Equation\u00a0(13)<\/span><\/a>?<\/li>\n
    2. Compare the answer above to the minimum age determined using a graphical method.<\/li>\n<\/ol>\n
      \n

      Solution to Exercise\u00a04<\/u><\/span><\/a>\u2ba7<\/p>\n<\/div>\n

      \n

      Return to where text linked to Exercise\u00a04<\/u>\u2ba5<\/span><\/a><\/p>\n<\/div>\n<\/div>\n","protected":false},"author":7,"menu_order":39,"template":"","meta":{"pb_show_title":"on","pb_short_title":"","pb_subtitle":"","pb_authors":[],"pb_section_license":""},"chapter-type":[],"contributor":[],"license":[],"class_list":["post-136","chapter","type-chapter","status-publish","hentry"],"part":39,"_links":{"self":[{"href":"https:\/\/books.gw-project.org\/age-dating-young-groundwater\/wp-json\/pressbooks\/v2\/chapters\/136","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/books.gw-project.org\/age-dating-young-groundwater\/wp-json\/pressbooks\/v2\/chapters"}],"about":[{"href":"https:\/\/books.gw-project.org\/age-dating-young-groundwater\/wp-json\/wp\/v2\/types\/chapter"}],"author":[{"embeddable":true,"href":"https:\/\/books.gw-project.org\/age-dating-young-groundwater\/wp-json\/wp\/v2\/users\/7"}],"version-history":[{"count":4,"href":"https:\/\/books.gw-project.org\/age-dating-young-groundwater\/wp-json\/pressbooks\/v2\/chapters\/136\/revisions"}],"predecessor-version":[{"id":438,"href":"https:\/\/books.gw-project.org\/age-dating-young-groundwater\/wp-json\/pressbooks\/v2\/chapters\/136\/revisions\/438"}],"part":[{"href":"https:\/\/books.gw-project.org\/age-dating-young-groundwater\/wp-json\/pressbooks\/v2\/parts\/39"}],"metadata":[{"href":"https:\/\/books.gw-project.org\/age-dating-young-groundwater\/wp-json\/pressbooks\/v2\/chapters\/136\/metadata\/"}],"wp:attachment":[{"href":"https:\/\/books.gw-project.org\/age-dating-young-groundwater\/wp-json\/wp\/v2\/media?parent=136"}],"wp:term":[{"taxonomy":"chapter-type","embeddable":true,"href":"https:\/\/books.gw-project.org\/age-dating-young-groundwater\/wp-json\/pressbooks\/v2\/chapter-type?post=136"},{"taxonomy":"contributor","embeddable":true,"href":"https:\/\/books.gw-project.org\/age-dating-young-groundwater\/wp-json\/wp\/v2\/contributor?post=136"},{"taxonomy":"license","embeddable":true,"href":"https:\/\/books.gw-project.org\/age-dating-young-groundwater\/wp-json\/wp\/v2\/license?post=136"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}