{"id":1515,"date":"2019-10-04T15:25:56","date_gmt":"2019-10-04T19:25:56","guid":{"rendered":"https:\/\/actlabs.readyforlaunch.ca\/?page_id=1515"},"modified":"2019-11-01T01:07:20","modified_gmt":"2019-11-01T05:07:20","slug":"isotopic-analysis","status":"publish","type":"page","link":"https:\/\/actlabs.com\/fr\/environmental\/services\/isotopic-analysis\/","title":{"rendered":"Isotopic Analysis"},"content":{"rendered":"<p><div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-1 nonhundred-percent-fullwidth non-hundred-percent-height-scrolling\" style=\"--awb-border-radius-top-left:0px;--awb-border-radius-top-right:0px;--awb-border-radius-bottom-right:0px;--awb-border-radius-bottom-left:0px;--awb-flex-wrap:wrap;\" ><div class=\"fusion-builder-row fusion-row\"><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-0 fusion_builder_column_1_5 1_5 fusion-one-fifth fusion-column-first fusion-no-small-visibility fusion-no-medium-visibility\" style=\"--awb-bg-size:cover;width:20%;width:calc(20% - ( ( 4% ) * 0.2 ) );margin-right: 4%;\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-column-wrapper-legacy\"><div class=\"fusion-widget-area awb-widget-area-element fusion-widget-area-1 fusion-content-widget-area\" style=\"--awb-title-color:#003f6d;--awb-padding:0px 0px 0px 0px;\"><style type=\"text\/css\" data-id=\"avada-vertical-menu-widget-6\">#avada-vertical-menu-widget-6 > ul.menu { margin-top: -8px; 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Analysis<\/span><span class=\"arrow\"><\/span><\/a><\/li><\/ul><\/li><li id=\"menu-item-2473\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-2473\"><a href=\"https:\/\/actlabs.com\/fr\/actlabs-downloads\/environment-resources\/\"><span class=\"link-text\"> Environment Resources<\/span><span class=\"arrow\"><\/span><\/a><\/li><\/ul><\/nav><\/div><div class=\"fusion-additional-widget-content\"><\/div><\/div><div class=\"fusion-clearfix\"><\/div><\/div><\/div>\n<div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-1 fusion_builder_column_3_4 3_4 fusion-three-fourth fusion-column-last\" style=\"--awb-bg-size:cover;width:75%;width:calc(75% - ( ( 4% ) * 0.75 ) );\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-column-wrapper-legacy\"><div class=\"fusion-title title fusion-title-1 fusion-sep-none fusion-title-text fusion-title-size-one\"><h1 class=\"fusion-title-heading title-heading-left\" style=\"margin:0;\">ISOTOPIC ANALYSIS<\/h1><\/div><div class=\"fusion-title title fusion-title-2 fusion-sep-none fusion-title-text fusion-title-size-two\"><h2 class=\"fusion-title-heading title-heading-left\" style=\"margin:0;\">Isotopes are different types of atoms of the same chemical element, each having a different atomic mass. Isotopes of an element have nuclei with the same number of protons but different numbers of neutrons.<\/h2><\/div><div class=\"fusion-text fusion-text-1\"><p><strong>Isotope analysis<\/strong> is the identification of isotopic signature, the distribution of certain isotopes within chemical compounds.<\/p>\n<p><strong>Isotope ratio mass spectrometry<\/strong> is a specialization of mass spectrometry, in which mass spectrometric methods are used to measure the relative abundance of isotopes in a given sample.<\/p>\n<\/div><div class=\"accordian fusion-accordian\" style=\"--awb-border-size:1px;--awb-icon-size:13px;--awb-content-font-size:18px;--awb-icon-alignment:left;--awb-hover-color:#f9f9f9;--awb-border-color:rgba(204,204,204,0);--awb-background-color:#f9f9f9;--awb-divider-color:#e0dede;--awb-divider-hover-color:#e0dede;--awb-icon-color:#ffffff;--awb-title-color:#1e99df;--awb-content-color:#4f4d4d;--awb-icon-box-color:#1a80b6;--awb-toggle-hover-accent-color:#1a80b6;--awb-title-font-family:&quot;Open Sans&quot;;--awb-title-font-weight:regular;--awb-title-font-style:normal;--awb-title-font-size:18px;--awb-title-line-height:1.2;--awb-content-font-family:&quot;Open Sans&quot;;--awb-content-font-style:normal;--awb-content-font-weight:400;\"><div class=\"panel-group fusion-toggle-icon-boxed\" id=\"accordion-1515-1\"><div class=\"fusion-panel panel-default panel-fd9c5d0e256e0a9ec fusion-toggle-no-divider fusion-toggle-boxed-mode\"><div class=\"panel-heading\"><h4 class=\"panel-title toggle\" id=\"toggle_fd9c5d0e256e0a9ec\"><a aria-expanded=\"false\" aria-controls=\"fd9c5d0e256e0a9ec\" role=\"button\" data-toggle=\"collapse\" data-target=\"#fd9c5d0e256e0a9ec\" href=\"#fd9c5d0e256e0a9ec\"><span class=\"fusion-toggle-icon-wrapper\" aria-hidden=\"true\"><i class=\"fa-fusion-box active-icon awb-icon-minus\" aria-hidden=\"true\"><\/i><i class=\"fa-fusion-box inactive-icon awb-icon-plus\" aria-hidden=\"true\"><\/i><\/span><span class=\"fusion-toggle-heading\">Code E10A<\/span><\/a><\/h4><\/div><div id=\"fd9c5d0e256e0a9ec\" class=\"panel-collapse collapse \" aria-labelledby=\"toggle_fd9c5d0e256e0a9ec\"><div class=\"panel-body toggle-content fusion-clearfix\">\n<div id=\"footable_parent_1764\"\n         class=\" footable_parent ninja_table_wrapper loading_ninja_table wp_table_data_press_parent semantic_ui \">\n                <table data-ninja_table_instance=\"ninja_table_instance_0\" data-footable_id=\"1764\" data-filter-delay=\"1000\" aria-label=\"Isotopic Analysis Code E10A.csv\"            id=\"footable_1764\"\n           data-unique_identifier=\"ninja_table_unique_id_2625749518_1764\"\n           class=\" foo-table ninja_footable foo_table_1764 ninja_table_unique_id_2625749518_1764 ui table  nt_type_legacy_table selectable celled striped compact vertical_centered  footable-paging-right ninja_table_search_disabled ninja_table_pro\">\n                <colgroup>\n                            <col class=\"ninja_column_0 \">\n                            <col class=\"ninja_column_1 \">\n                            <col class=\"ninja_column_2 \">\n                    <\/colgroup>\n        <thead>\n<tr class=\"footable-header\">\n                                                        <th scope=\"col\"  class=\"ninja_column_0 ninja_clmn_nm_parameter \">\ufeffParameter<\/th><th scope=\"col\"  class=\"ninja_column_1 ninja_clmn_nm_amtrequired \">Amt. Required<\/th><th scope=\"col\"  class=\"ninja_column_2 ninja_clmn_nm_precision \">Precision<\/th><\/tr>\n<\/thead>\n<tbody>\n\n        <tr data-row_id=\"6006\" class=\"ninja_table_row_0 nt_row_id_6006\">\n            <td>Pb - Isotopic analysis by HR-ICP-MS (Pb >15ppm)<\/td><td>~ 1 g<\/td><td>0.4 - 0.5%<\/td>        <\/tr>\n            <tr data-row_id=\"6007\" class=\"ninja_table_row_1 nt_row_id_6007\">\n            <td>Pb - Isotopic analysis<\/td><td>~ 1 g<\/td><td>0.1 - 0.2%<\/td>        <\/tr>\n            <tr data-row_id=\"6008\" class=\"ninja_table_row_2 nt_row_id_6008\">\n            <td>Nd - Isotopic Analysis<\/td><td>~ 1 g<\/td><td><\/td>        <\/tr>\n            <tr data-row_id=\"6009\" class=\"ninja_table_row_3 nt_row_id_6009\">\n            <td>Sr - Isotopic Analysis<\/td><td>~ 1 g<\/td><td><\/td>        <\/tr>\n            <tr data-row_id=\"6010\" class=\"ninja_table_row_4 nt_row_id_6010\">\n            <td>Sm-Nd - Isotopic Analysis<\/td><td>~ 1 g<\/td><td><\/td>        <\/tr>\n            <tr data-row_id=\"6011\" class=\"ninja_table_row_5 nt_row_id_6011\">\n            <td>Rb-Sr - Isotopic Analysis<\/td><td>~ 1 g<\/td><td><\/td>        <\/tr>\n            <tr data-row_id=\"6012\" class=\"ninja_table_row_6 nt_row_id_6012\">\n            <td>Hg - Isotopic Analysis<\/td><td>~ 1 g<\/td><td><\/td>        <\/tr>\n            <tr data-row_id=\"6013\" class=\"ninja_table_row_7 nt_row_id_6013\">\n            <td>\u03b4\u00a013\u00a0C \u2013 Graphite or Organic Material<\/td><td>1 mg C<\/td><td>0.2 \u2030<\/td>        <\/tr>\n            <tr data-row_id=\"6014\" class=\"ninja_table_row_8 nt_row_id_6014\">\n            <td>\u03b4\u00a013\u00a0C\u00a0and \u03b4\u00a018\u00a0O \u2013 Carbonates<\/td><td>1 mg C<\/td><td>0.2 \u2030<\/td>        <\/tr>\n            <tr data-row_id=\"6015\" class=\"ninja_table_row_9 nt_row_id_6015\">\n            <td>\u03b4\u00a013\u00a0C and \u03b4\u00a018\u00a0O \u2013 Siderite, Magnesite, Dolomite<\/td><td>1 mg C<\/td><td>0.2 \u2030<\/td>        <\/tr>\n            <tr data-row_id=\"6016\" class=\"ninja_table_row_10 nt_row_id_6016\">\n            <td>Nitrogen Isotopes - Organic Material<\/td><td>\u00a0 \u00a0 \u00a0<\/td><td><\/td>        <\/tr>\n            <tr data-row_id=\"6017\" class=\"ninja_table_row_11 nt_row_id_6017\">\n            <td>Deuterium Isotopic Analysis \u2013 Water<\/td><td>20 ml<\/td><td>3.00%<\/td>        <\/tr>\n            <tr data-row_id=\"6018\" class=\"ninja_table_row_12 nt_row_id_6018\">\n            <td>Deuterium Isotopic Analysis \u2013 Minerals<\/td><td>1 mg<\/td><td>0.2 \u2030<\/td>        <\/tr>\n            <tr data-row_id=\"6019\" class=\"ninja_table_row_13 nt_row_id_6019\">\n            <td>\u03b4\u00a018\u00a0O \u2013 Water<\/td><td>20 mL<\/td><td>0.2 \u2030<\/td>        <\/tr>\n            <tr data-row_id=\"6020\" class=\"ninja_table_row_14 nt_row_id_6020\">\n            <td>\u03b4\u00a018\u00a0O \u2013 Silicates<\/td><td>15 mg<\/td><td>0.3 \u2030<\/td>        <\/tr>\n            <tr data-row_id=\"6021\" class=\"ninja_table_row_15 nt_row_id_6021\">\n            <td>\u03b4\u00a018\u00a0O \u2013 Sulphates<\/td><td>25 mg<\/td><td>0.3 \u2030<\/td>        <\/tr>\n            <tr data-row_id=\"6022\" class=\"ninja_table_row_16 nt_row_id_6022\">\n            <td>\u03b4\u00a018\u00a0O \u2013 Organics<\/td><td>10 mg N<\/td><td>0.2 \u2030<\/td>        <\/tr>\n            <tr data-row_id=\"6023\" class=\"ninja_table_row_17 nt_row_id_6023\">\n            <td>\u03b4\u00a034\u00a0S \u2013 Sulphate<\/td><td>10 mg<\/td><td>0.2 \u2030<\/td>        <\/tr>\n            <tr data-row_id=\"6024\" class=\"ninja_table_row_18 nt_row_id_6024\">\n            <td>\u03b4\u00a034\u00a0S \u2013 Sulphate in water<\/td><td><\/td><td><\/td>        <\/tr>\n            <tr data-row_id=\"6025\" class=\"ninja_table_row_19 nt_row_id_6025\">\n            <td>\u03b4\u00a034\u00a0S \u2013 Sulphide<\/td><td>5 mg<\/td><td>0.2 \u2030<\/td>        <\/tr>\n            <tr data-row_id=\"6026\" class=\"ninja_table_row_20 nt_row_id_6026\">\n            <td>\u03b4\u00a034\u00a0S \u2013 Sulphide-bearing material which contains carbonate<\/td><td>100 mg<\/td><td>0.2 \u2030<\/td>        <\/tr>\n            <tr data-row_id=\"6027\" class=\"ninja_table_row_21 nt_row_id_6027\">\n            <td>\u03b4\u00a034\u00a0S \u2013 Silicate rocks which contain sulphur<\/td><td><\/td><td><\/td>        <\/tr>\n            <tr data-row_id=\"6028\" class=\"ninja_table_row_22 nt_row_id_6028\">\n            <td>3\u00a0H \u2013 Direct<\/td><td>20 mL<\/td><td>8.0 TU<\/td>        <\/tr>\n            <tr data-row_id=\"6029\" class=\"ninja_table_row_23 nt_row_id_6029\">\n            <td>3\u00a0H \u2013 Enriched<\/td><td>1L<\/td><td>0.8 TU<\/td>        <\/tr>\n            <tr data-row_id=\"6030\" class=\"ninja_table_row_24 nt_row_id_6030\">\n            <td>3\u00a0H \u2013 Accelerator Mass Spectrometry (AMS)<\/td><td>1L<\/td><td><\/td>        <\/tr>\n            <tr data-row_id=\"6031\" class=\"ninja_table_row_25 nt_row_id_6031\">\n            <td>C-14 - Accelerator Mass Spectrometry (AMS)<\/td><td>please inquire<\/td><td><\/td>        <\/tr>\n    <\/tbody><!--ninja_tobody_rendering_done-->\n    <\/table>\n    \n    \n    \n<\/div>\n\n<\/div><\/div><\/div><div class=\"fusion-panel panel-default panel-5b6601cbae5d6f839 fusion-toggle-no-divider fusion-toggle-boxed-mode\"><div class=\"panel-heading\"><h4 class=\"panel-title toggle\" id=\"toggle_5b6601cbae5d6f839\"><a aria-expanded=\"false\" aria-controls=\"5b6601cbae5d6f839\" role=\"button\" data-toggle=\"collapse\" data-target=\"#5b6601cbae5d6f839\" href=\"#5b6601cbae5d6f839\"><span class=\"fusion-toggle-icon-wrapper\" aria-hidden=\"true\"><i class=\"fa-fusion-box active-icon awb-icon-minus\" aria-hidden=\"true\"><\/i><i class=\"fa-fusion-box inactive-icon awb-icon-plus\" aria-hidden=\"true\"><\/i><\/span><span class=\"fusion-toggle-heading\">E10A - Deuterium - Water<\/span><\/a><\/h4><\/div><div id=\"5b6601cbae5d6f839\" class=\"panel-collapse collapse \" aria-labelledby=\"toggle_5b6601cbae5d6f839\"><div class=\"panel-body toggle-content fusion-clearfix\">\n<p>Deuterium isotopes are determined by injecting water samples into a Thermo Finnigan DeltaPlusXL IRMS system, coupled with an elemental analyzer. The chromium reduction tube within the elemental analyzer converts the water samples to hydrogen gas at 950\u00b0C. A helium carrier gas then transfers the hydrogen gas to the IRMS system. Hydrogen isotopic ratios are measured and deuterium isotopes are reported.<\/p>\n<\/div><\/div><\/div><div class=\"fusion-panel panel-default panel-2d54ea400153292b3 fusion-toggle-no-divider fusion-toggle-boxed-mode\"><div class=\"panel-heading\"><h4 class=\"panel-title toggle\" id=\"toggle_2d54ea400153292b3\"><a aria-expanded=\"false\" aria-controls=\"2d54ea400153292b3\" role=\"button\" data-toggle=\"collapse\" data-target=\"#2d54ea400153292b3\" href=\"#2d54ea400153292b3\"><span class=\"fusion-toggle-icon-wrapper\" aria-hidden=\"true\"><i class=\"fa-fusion-box active-icon awb-icon-minus\" aria-hidden=\"true\"><\/i><i class=\"fa-fusion-box inactive-icon awb-icon-plus\" aria-hidden=\"true\"><\/i><\/span><span class=\"fusion-toggle-heading\">E10A - Deuterium - Minerals<\/span><\/a><\/h4><\/div><div id=\"2d54ea400153292b3\" class=\"panel-collapse collapse \" aria-labelledby=\"toggle_2d54ea400153292b3\"><div class=\"panel-body toggle-content fusion-clearfix\">\n<p>Samples weighing 0.02 to 1.0 g are wrapped in molybdenum foil and placed in a platinum crucible which is then suspended inside a quartz extraction vessel. The vessel and its contents are outgassed in a vacuum at 120\u00b0C for 4 hours to remove surface-adsorbed water. The sample is then inductively heated at 1400\u00b0C for up to 20 minutes and the gases are collected in a trap held at -196\u00b0C. Nearly all of the hydrogen is released in the form of water, but miniscule quantities of hydrocarbons or molecular hydrogen released or produced during this treatment are oxidized over CuO at 550\u00b0C to form H<sub>2<\/sub>O and CO<sub>2<\/sub> which are also collected in the trap. The accumulated water representing the total amount of hydrogen in the samples is separated from the other gases by differential freezing techniques. The water is reacted with uranium at 900\u00b0C to produce H2 and collected on charcoal at -196\u00b0C. The volume of the H<sub>2<\/sub> is measured manometrically. Analyses of the water contents are reproducible to \u00b1 0.2 weight percent.<\/p>\n<p>Isotopic analyses, made by conventional isotope ratio mass spectrometry, are reported in the familiar notation in per mil relative to the V-SMOW standard. Duplicate analyses are made of some of these samples and the \u03b4D values agree to better than \u00b1 3. Using the procedure described above we measured a \u03b4D value of -65 for the NSB-30 biotite standard.<\/p>\n<\/div><\/div><\/div><div class=\"fusion-panel panel-default panel-2cb997d86c5269560 fusion-toggle-no-divider fusion-toggle-boxed-mode\"><div class=\"panel-heading\"><h4 class=\"panel-title toggle\" id=\"toggle_2cb997d86c5269560\"><a aria-expanded=\"false\" aria-controls=\"2cb997d86c5269560\" role=\"button\" data-toggle=\"collapse\" data-target=\"#2cb997d86c5269560\" href=\"#2cb997d86c5269560\"><span class=\"fusion-toggle-icon-wrapper\" aria-hidden=\"true\"><i class=\"fa-fusion-box active-icon awb-icon-minus\" aria-hidden=\"true\"><\/i><i class=\"fa-fusion-box inactive-icon awb-icon-plus\" aria-hidden=\"true\"><\/i><\/span><span class=\"fusion-toggle-heading\"> E10A - \u03b4 18 O \u2013 Water<\/span><\/a><\/h4><\/div><div id=\"2cb997d86c5269560\" class=\"panel-collapse collapse \" aria-labelledby=\"toggle_2cb997d86c5269560\"><div class=\"panel-body toggle-content fusion-clearfix\">\n<p>Oxygen isotopes ( \u03b4 <sup>18<\/sup> O) are determined by conventional CO<sub>2<\/sub>\u2013H<sub>2<\/sub>O equilibration (Epstein and Mayeda, 1953). A small aliquot of tank CO<sub>2<\/sub> is added to a vessel containing a surplus of the sample water. The vessel is sealed and emerged in a water bath at 25.0 \u00b0 C and agitated to facilitate H<sub>2<\/sub>O\u2013CO<sub>2<\/sub> equilibration. Equilibration time is 48 hours, long enough to equilibrate brines with high Mg contents. CO<sub>2<\/sub> from equilibrated samples is extracted on a vacuum line and cryogenically purified. Isotopic analyses are performed on a Finnigan MAT Delta Gas Isotope Ratio Mass Spectrometer (GIRMS). Isotopic data are reported in the standard delta notation as per mil deviations from V\u2013SMOW. The CO<sub>2<\/sub>\u2013H<sub>2<\/sub>O equilibration factor used is 1.0412. External reproducibility is \u00b10.14\u2030 (1 \u03c3 ) based on repeats of our dilute U of S water standard.<\/p>\n<p><strong>Notation<\/strong><\/p>\n<p>\u03b4 <sup>18<\/sup> O = (<sup>18<\/sup>O\/<sup>16<\/sup>O<sub>sample<\/sub>\/<sup>18<\/sup>O\/<sup>16<\/sup>O<sub>V\u2013SMOW<\/sub> \u2013 1)10<sup>3<\/sup><\/p>\n<p>\u03b4 D = (<sup>2<\/sup>H\/<sup>1<\/sup>H<sub>sample<\/sub>\/<sup>2<\/sup>H\/<sup>1<\/sup>H<sub>V\u2013SMOW<\/sub> \u2013 1)10<sup>3<\/sup><\/p>\n<p><strong>References<\/strong><\/p>\n<p>Bigeleisen J., Perlman M.L. and Prosser H.C., 1952. Conversion of hydrogenic materials to hydrogen for isotopic analysis. Analytical Chemistry, volume 24, pp. 1356-1357.<\/p>\n<p>Epstein S. and Mayeda T.K., 1953. Variations in the <sup>18<\/sup>O\/<sup>16<\/sup>O ratio in natural waters. Geochimica et Cosmochimica Acta, volume 4, p. 213.<\/p>\n<\/div><\/div><\/div><div class=\"fusion-panel panel-default panel-0b1a18c11070fe246 fusion-toggle-no-divider fusion-toggle-boxed-mode\"><div class=\"panel-heading\"><h4 class=\"panel-title toggle\" id=\"toggle_0b1a18c11070fe246\"><a aria-expanded=\"false\" aria-controls=\"0b1a18c11070fe246\" role=\"button\" data-toggle=\"collapse\" data-target=\"#0b1a18c11070fe246\" href=\"#0b1a18c11070fe246\"><span class=\"fusion-toggle-icon-wrapper\" aria-hidden=\"true\"><i class=\"fa-fusion-box active-icon awb-icon-minus\" aria-hidden=\"true\"><\/i><i class=\"fa-fusion-box inactive-icon awb-icon-plus\" aria-hidden=\"true\"><\/i><\/span><span class=\"fusion-toggle-heading\"> E10A - \u03b4 18 O \u2013 Silicates<\/span><\/a><\/h4><\/div><div id=\"0b1a18c11070fe246\" class=\"panel-collapse collapse \" aria-labelledby=\"toggle_0b1a18c11070fe246\"><div class=\"panel-body toggle-content fusion-clearfix\">\n<p>Silicate and oxide samples are reacted with BrF<sub>5<\/sub> at ~650\u00b0C in nickel bombs following the procedures described in Clayton and Mayeda (1963). The fluorination reaction converts O in the mineral(s) to O<sub>2<\/sub> gas, which is subsequently converted to CO2 gas using a hot C rod. All reaction steps are quantitative. Isotopic analyses are performed on a Finnigan MAT Delta, dual inlet, isotope ratio mass spectrometer. The data are reported in the standard delta notation as per mil deviations from V\u2013SMOW. External reproducibility is \u00b1 0.19\u2030 (1 s ) based on repeat analyses of our internal white crystal standard (WCS). Our value for NBS 28 is 9.61 \u00b10.10\u2030 (1 s ).<\/p>\n<p><strong>Notation<\/strong><\/p>\n<p>\u03b4<sup>18<\/sup>O = (<sup>18<\/sup>O\/<sup>16<\/sup>O<sub>sample<\/sub>\/<sup>18<\/sup>O\/<sup>16<\/sup>O<sub>V\u2013SMOW<\/sub> \u2013 1)10<sup>3<\/sup><\/p>\n<p><strong>References<\/strong><\/p>\n<p>Clayton, R. N., and Mayeda, T., 1963. The use of bromine pentafluoride in the extraction of oxygen from oxides and silicates for isotopic analysis. Geochimica et Cosmochimica Acta, volume 27, pp. 47-52.<\/p>\n<\/div><\/div><\/div><div class=\"fusion-panel panel-default panel-826d4ae34988577bf fusion-toggle-no-divider fusion-toggle-boxed-mode\"><div class=\"panel-heading\"><h4 class=\"panel-title toggle\" id=\"toggle_826d4ae34988577bf\"><a aria-expanded=\"false\" aria-controls=\"826d4ae34988577bf\" role=\"button\" data-toggle=\"collapse\" data-target=\"#826d4ae34988577bf\" href=\"#826d4ae34988577bf\"><span class=\"fusion-toggle-icon-wrapper\" aria-hidden=\"true\"><i class=\"fa-fusion-box active-icon awb-icon-minus\" aria-hidden=\"true\"><\/i><i class=\"fa-fusion-box inactive-icon awb-icon-plus\" aria-hidden=\"true\"><\/i><\/span><span class=\"fusion-toggle-heading\">E10A - 3H Enriched<\/span><\/a><\/h4><\/div><div id=\"826d4ae34988577bf\" class=\"panel-collapse collapse \" aria-labelledby=\"toggle_826d4ae34988577bf\"><div class=\"panel-body toggle-content fusion-clearfix\">\n<p>Tritium (T or 3H), a hydrogen isotope with a half-life of 12.43 years is being produced naturally by the impact of cosmic neutrons on nitrogen nuclei (cosmic ray spallation) by the reaction:<\/p>\n<p>14 7 N+10n \u2192 126C+31H<\/p>\n<p>Free 3H collides with O2 to form 1H3HO via 3HO2 and enters the water cycle. Production in the upper atmosphere causes a steady state on the order of 4 to 25 tritium units (TU) in precipitation. Since 1952, tritium produced by open air thermonuclear tests has overshadowed natural production, at times by 2 or 3 orders of magnitude.<\/p>\n<p>Liquid scintillation counting (LSC) is the technique used for the detection and quantification of tritium. Tritium measurements have a lower limit of detection of approximately 6 tritium units for water counted directly. Samples with a tritium content near this level are enriched approximately 15 times by electrolysis and then counted. The detection limit for enriched samples is 0.6 \u00b1 0.8 TU.<\/p>\n<p>Tritium measurements (counts per minute [cpm]) are converted directly into absolute concentrations where:<\/p>\n<p>1 TU = 1-3H\/1018-1H = 7.19 dpm\/l = 3.26 pCi\/l = 0.11815 Bq\/l<\/p>\n<p>The sample is processed as follows:<\/p>\n<p><img decoding=\"async\" class=\"lazyload alignleft size-full wp-image-1519\" src=\"https:\/\/actlabs.com\/wp-content\/uploads\/2019\/10\/E10A-3H-Enriched-sample-processing-1.jpg\" data-orig-src=\"https:\/\/actlabs.com\/wp-content\/uploads\/2019\/10\/E10A-3H-Enriched-sample-processing-1.jpg\" alt=\"\" width=\"941\" height=\"283\" srcset=\"data:image\/svg+xml,%3Csvg%20xmlns%3D%27http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%27%20width%3D%27941%27%20height%3D%27283%27%20viewBox%3D%270%200%20941%20283%27%3E%3Crect%20width%3D%27941%27%20height%3D%27283%27%20fill-opacity%3D%220%22%2F%3E%3C%2Fsvg%3E\" data-srcset=\"https:\/\/actlabs.com\/wp-content\/uploads\/2019\/10\/E10A-3H-Enriched-sample-processing-1-200x60.jpg 200w, https:\/\/actlabs.com\/wp-content\/uploads\/2019\/10\/E10A-3H-Enriched-sample-processing-1-300x90.jpg 300w, https:\/\/actlabs.com\/wp-content\/uploads\/2019\/10\/E10A-3H-Enriched-sample-processing-1-400x120.jpg 400w, https:\/\/actlabs.com\/wp-content\/uploads\/2019\/10\/E10A-3H-Enriched-sample-processing-1-600x180.jpg 600w, https:\/\/actlabs.com\/wp-content\/uploads\/2019\/10\/E10A-3H-Enriched-sample-processing-1-768x231.jpg 768w, https:\/\/actlabs.com\/wp-content\/uploads\/2019\/10\/E10A-3H-Enriched-sample-processing-1-800x241.jpg 800w, https:\/\/actlabs.com\/wp-content\/uploads\/2019\/10\/E10A-3H-Enriched-sample-processing-1-940x283.jpg 940w, https:\/\/actlabs.com\/wp-content\/uploads\/2019\/10\/E10A-3H-Enriched-sample-processing-1.jpg 941w\" data-sizes=\"auto\" data-orig-sizes=\"(max-width: 941px) 100vw, 941px\" \/><\/p>\n<p>A Canberra-Packard Pico-fluor LLT (low level tritium) cocktail is used, which has a high carrying capacity for water with high efficiency and low background characteristics.<\/p>\n<p>The laboratory standard is NBS-4361 tritium reference material diluted with background water which is then calibrated to NBS-4926C. 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