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* Sample and sample pretreatment should be documented, if possible a picture should show the quality of the prepared sample.** To establish the quality of the sample preparation outside our laboratory these samples should be accompanied by • at least two background samples • one or two standard samples (e.g. These samples have to be prepared in the same laboratory in substantially the same way as the unknown samples and will be charged as regular samples..pass_color_to_child_links a.u-inline.u-margin-left--xs.u-margin-right--sm.u-padding-left--xs.u-padding-right--xs.u-relative.u-absolute.u-absolute--center.u-width--100.u-flex-inline.u-flex-align-self--center.u-flex-justify--between.u-serif-font-main--regular.js-wf-loaded .u-serif-font-main--regular.amp-page .u-serif-font-main--regular.u-border-radius--ellipse.u-hover-bg--black-transparent.web_page .u-hover-bg--black-transparent:hover. Content Header .feed_item_answer_user.js-wf-loaded . The uncertainty changes according to the age of the sample and will be larger for older material.
Radiocarbon dating is the principal method for determining the age of carbon-bearing materials from the present to about 50,000 years ago.We also offer liquid scintillation analysis using an extra low background Quantulus 1220 for high precision measurements on benzene.Very small samples (less than 300 mg) are analyzed by accelerator mass spectrometry (AMS).C dating service is for samples yielding at least 0.5 mg of carbon after chemical pretreatment (often acid-alkali-acid treatment of organic material).The precision of radiocarbon dates for recent samples (younger than 2000 years) is better than 0.4% which equals /-35 years for the 1-σ statistical uncertainty of the measured age.