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Christian religion, Christianity - a monotheistic system of beliefs and practices based on the Old Testament and the teachings of Jesus as embodied in the New Testament and emphasizing the role of Jesus as saviordoomed - marked by or promising bad fortune; "their business venture was doomed from the start"; "an ill-fated business venture"; "an ill-starred romance"; "the unlucky prisoner was again put in irons"- W. Prescottunfortunate - not favored by fortune; marked or accompanied by or resulting in ill fortune; "an unfortunate turn of events"; "an unfortunate decision"; "unfortunate investments"; "an unfortunate night for all concerned"sure, certain - certain to occur; destined or inevitable; "he was certain to fail"; "his fate is certain"; "In this life nothing is certain but death and taxes"- Benjamin Franklin; "he faced certain death"; "sudden but sure regret"; "he is sure to win" couple, looking oh, so plump and juicy, fell from her reluctant hands, a shout from the street completed the anguish of the girls, for it told them that their feast was being exulted over by the little Irish children, who were their sworn foes.A form of radiometric dating used to determine the age of organic remains in ancient objects, such as archaeological specimens, on the basis of the half-life of carbon-14 and a comparison between the ratio of carbon-12 to carbon-14 in a sample of the remains to the known ratio in living organisms. A technique for measuring the age of organic remains based on the rate of decay of carbon 14..boxy-content a.term-action, button.term-action a.term-action:hover, button.term-action:hover .term-action-bg .term-uex .term-cite .term-fc .term-edit .boxy-dflt-hder .definition .definition a .definition h2 .example, .highlight-term a.round-btn, a.round-btn.selected:hover a.round-btn:hover, a.round-btn.selected .social-icon a.round-btn .social-icon a.round-btn:hover a.round-btn .fa-facebook a.round-btn .fa-twitter a.round-btn .fa-google-plus .rotate a a.up:hover, selected, a.down:hover, selected, .vote-status .adjacent-term .adjacent-term:hover .adjacent-term .past-tod .past-tod:hover .tod-term .tod-date .tip-content .tooltip-inner .term-tool-action-block .term-link-embed-content .term-fc-options .term-fc-options li .term-fc-options li a .checkmark .quiz-option .quiz-option-bullet .finger-button.quiz-option:hover .definition-number .wd-75 .wd-20 .left-block-terms .left-block-terms .left-block-terms li .no-padding .no-padding-left .no-padding-right .boxy-spacing @media (min-width: 768px) @media (max-width: 768px) @media print { a:link:after, a:visited:after nav, .term-action, #wfi-ad-slot-leaderboard, .wfi-slot, #related-articles, .pop-quiz, #right-block, .

Because atmospheric carbon 14 arises at about the same rate that the atom decays, Earth's levels of carbon 14 have remained fairly constant.

Once an organism is dead, however, no new carbon is actively absorbed by its tissues, and its carbon 14 gradually decays.

He first noted that the cells of all living things contain atoms taken in from the organism's environment, including carbon; all organic compounds contain carbon.

Most carbon consists of the isotopes carbon 12 and carbon 13, which are very stable.

For inorganic materials, such as rocks containing the radioactive isotope rubidium, the amount of the isotope in the object is compared to the amount of the isotope's decay products (in this case strontium).

Last modified 27-Oct-2019 01:45