{"id":134,"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\/ch055-xhtml\/"},"modified":"2026-05-11T17:37:58","modified_gmt":"2026-05-11T17:37:58","slug":"exercise-2","status":"publish","type":"chapter","link":"https:\/\/books.gw-project.org\/age-dating-young-groundwater\/chapter\/exercise-2\/","title":{"raw":"Exercise\u00a02","rendered":"Exercise\u00a02"},"content":{"raw":"
\r\n
\r\n\r\nThe following results are obtained from fitting the CE model to four measured gas concentrations ([latex]C_{m}[\/latex]). Three parameters were varied to find the best fit simulated concentrations ([latex]C_{S}[\/latex]) shown. Estimated measurement errors are shown for each dissolved gas concentration. Calculate the p<\/em>\u2011value for these model results. How confident would you be in using this model to determine [latex]\\frac{_{}^{3}H}{_{}^{3}{He}}[\/latex] age for this groundwater sample? All concentrations are in units of ccSTP\/g.\r\n\r\n<\/div>\r\n<\/colgroup>\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n
Gas<\/th>\r\nMeasured Concentration<\/th>\r\nError (\u03c3)<\/th>\r\nBest\u2011fit simulated concentration<\/th>\r\n<\/tr>\r\n<\/thead>\r\n
Xe<\/td>\r\n1.238 x 10-8<\/sup><\/td>\r\n3.71 x 10-10<\/sup><\/td>\r\n1.202 x 10-8<\/sup><\/td>\r\n<\/tr>\r\n
Kr<\/td>\r\n8.302 x 10-8<\/sup><\/td>\r\n2.49 x 10-9<\/sup><\/td>\r\n8.624 x 10-8<\/sup><\/td>\r\n<\/tr>\r\n
Ar<\/td>\r\n3.876 x 10-4<\/sup><\/td>\r\n1.16 x 10-5<\/sup><\/td>\r\n3.854 x 10-4<\/sup><\/td>\r\n<\/tr>\r\n
Ne<\/td>\r\n2.495 x 10-7<\/sup><\/td>\r\n7.49 x 10-9<\/sup><\/td>\r\n2.489 x 10-7<\/sup><\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n
\r\n\r\nSolution\u00a0Exercise\u00a02<\/u><\/span>\u2ba5<\/a>\r\n\r\n<\/div>\r\n
\r\n\r\nReturn t<\/span>o where text linked to Exercise\u00a02<\/span><\/u><\/strong><\/a>\u2ba5\r\n\r\n<\/div>\r\n<\/div>","rendered":"
\n
\n

The following results are obtained from fitting the CE model to four measured gas concentrations ([latex]C_{m}[\/latex]). Three parameters were varied to find the best fit simulated concentrations ([latex]C_{S}[\/latex]) shown. Estimated measurement errors are shown for each dissolved gas concentration. Calculate the p<\/em>\u2011value for these model results. How confident would you be in using this model to determine [latex]\\frac{_{}^{3}H}{_{}^{3}{He}}[\/latex] age for this groundwater sample? All concentrations are in units of ccSTP\/g.<\/p>\n<\/div>\n\n\n\n\n\n<\/colgroup>\n\n\n\n\n\n\n\n
Gas<\/th>\nMeasured Concentration<\/th>\nError (\u03c3)<\/th>\nBest\u2011fit simulated concentration<\/th>\n<\/tr>\n<\/thead>\n
Xe<\/td>\n1.238 x 10-8<\/sup><\/td>\n3.71 x 10-10<\/sup><\/td>\n1.202 x 10-8<\/sup><\/td>\n<\/tr>\n
Kr<\/td>\n8.302 x 10-8<\/sup><\/td>\n2.49 x 10-9<\/sup><\/td>\n8.624 x 10-8<\/sup><\/td>\n<\/tr>\n
Ar<\/td>\n3.876 x 10-4<\/sup><\/td>\n1.16 x 10-5<\/sup><\/td>\n3.854 x 10-4<\/sup><\/td>\n<\/tr>\n
Ne<\/td>\n2.495 x 10-7<\/sup><\/td>\n7.49 x 10-9<\/sup><\/td>\n2.489 x 10-7<\/sup><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\n

Solution\u00a0Exercise\u00a02<\/u><\/span>\u2ba5<\/a><\/p>\n<\/div>\n

\n

Return t<\/span>o where text linked to Exercise\u00a02<\/span><\/u><\/strong><\/a>\u2ba5<\/p>\n<\/div>\n<\/div>\n","protected":false},"author":7,"menu_order":37,"template":"","meta":{"pb_show_title":"on","pb_short_title":"","pb_subtitle":"","pb_authors":[],"pb_section_license":""},"chapter-type":[],"contributor":[],"license":[],"class_list":["post-134","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\/134","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":2,"href":"https:\/\/books.gw-project.org\/age-dating-young-groundwater\/wp-json\/pressbooks\/v2\/chapters\/134\/revisions"}],"predecessor-version":[{"id":352,"href":"https:\/\/books.gw-project.org\/age-dating-young-groundwater\/wp-json\/pressbooks\/v2\/chapters\/134\/revisions\/352"}],"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\/134\/metadata\/"}],"wp:attachment":[{"href":"https:\/\/books.gw-project.org\/age-dating-young-groundwater\/wp-json\/wp\/v2\/media?parent=134"}],"wp:term":[{"taxonomy":"chapter-type","embeddable":true,"href":"https:\/\/books.gw-project.org\/age-dating-young-groundwater\/wp-json\/pressbooks\/v2\/chapter-type?post=134"},{"taxonomy":"contributor","embeddable":true,"href":"https:\/\/books.gw-project.org\/age-dating-young-groundwater\/wp-json\/wp\/v2\/contributor?post=134"},{"taxonomy":"license","embeddable":true,"href":"https:\/\/books.gw-project.org\/age-dating-young-groundwater\/wp-json\/wp\/v2\/license?post=134"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}