How to use isotope in a sentence

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Sentence Examples The isotope dilution or spike approach was a major advance in measuring small amounts of parent and daughter isotope in a sample. An isotope of the rare element technetium, denoted Tc, is widely used to form images of the heart, brain, lungs, spleen, and other organs. For that reason the isotope composition of the labelling solution was determined. It relies on an analysis of how much of a radioactive isotope has decayed into its daughter isotope. Over time these original ratios will become modified as more and more of the parent isotope turns into the radiogenic daughter isotope. We know that for a fact because we've measured the isotope ratio of deuterium and hydrogen. Besides hydrogen and its isotope deuterium, researchers use the isotopes of boron, oxygen, nitrogen and carbon. The half-life of an isotope can vary in length from nanoseconds to millions or billions of years. They could also tolerate a high-protein meat diet, as indicated by stable isotope analysis of Neanderthal bones. In 1968, Thiorso and associates at Berkeley used a few atoms of this isotope to study the oxidation behavior of lawrencium. Both samples are sent away for carbon dioxide isotope analysis by mass spectrometry. We are waiting for the results of carbon dating and uranium isotope dating to give us more information about how old the skull is. In a cyclotron particle accelerator, researchers fired an isotope of calcium at a target of americium. Deuterium, a heavy and stable isotope of hydrogen, binds to oxygen to form deuterium oxide, commonly known as heavy water. A common emitter of negative beta particles is carbon-14, the radioactive isotope of carbon that is found in all living plants and animals. Other examples of relative isotopic dating are the deuterium variations in ice cores and the osmium isotope record of marine sediments. The applicability of granular cubic antimonic acid as column packing material in chromatographic lithium isotope separation was investigated. A prominent negative carbon isotope pulse lasting a few 10 years has been identified in Oxfordian sediments. The observed carbon isotope excursions can be traced throughout different localities with different depositional environments and histories. In addition, a small clipping was taken from a secondary flight feather for stable-hydrogen isotope analysis. Show More Sentences This indicated that tissue stable sulfur isotope turnover in these mussels is influenced by sulfide detoxification activities. A gallium scintigraphic scan showed markedly increased uptake of isotope in the lesion. The isotope film becomes gradually positively charged as it loses electrons. These portable thermoelectric generators contain a sizable amount of strontium-90, a highly potent radioactive isotope. Moreover, this isotope could be useful as a tracer of the flux of organic matter in ocean surface waters. Because of the different number of elementary particles in the atom the element is an isotope. Beta radiation is the emission of an electron from the nucleus of a radioactive isotope. Tritium, the radioactive isotope of hydrogen that is produced in the atmosphere, is also a beta emitter. The two elements preserve an environmental fingerprint in the form of an isotope signature. The isotope source gives off photons, usually Gamma rays, which radiate back to the meter's detectors on the bottom of the unit. Deuterium is an isotope of hydrogen containing a proton and neutron in its nucleus, while normal hydrogen has only a proton. In rare cases where a quantum mechanical effect called tunneling occurs in the reaction, deuterium isotope effects of 20 or more have been observed. Uranium for the first atomic bomb and for nuclear reactors was enriched in the 235 isotope, as compared to the more abundant 238 isotope, by gaseous diffusion. Unlike other carbon-dating methods that monitor scintillations produced by radioactive decay, the TAMS method counts the actual number of carbon isotope atoms in a sample. This radioactive isotope is created when energetic particles in cosmic rays enter the Earth's atmosphere and split atomic nuclei of nitrogen and oxygen. Cesium 137, a radioactive cesium isotope with a mass number of 137 and a half-life of 33 years, is used for gamma irradiation of certain foods and for radiation therapy. When a neutron is added, hydrogen's atomic mass rises to two, yielding deuterium, in isotope which is necessary for the manufacture of the hydrogen bomb. This is the only isotope of francium occurring in nature, but at most there is only 20-30 g of the element present in the earth's crust at any one time. In 1986 the world's leading science journal announced that the most ancient rock crystals on earth, according to isotope dating methods, are 4.3 billion years old. The stable isotope composition of the first and second stages of the worm tube carbonates is similar to that of carbonates from modern petroleum seeps. Show More Sentences If that methane were suddenly liberated from its enclosing clathrate prison the impact on the carbon isotope record would be immediate and severe. One of the isotopes of fission products, when fuel melts, is an iodine isotope, and it goes in your body through your thyroid. So only this isotope can be used to create a runaway chain reaction. Early attempts applying the Sm-Nd isotope system to garnet and clinopyroxene were encouraging and often yielded dates considered as representing near-peak P-T conditions. He developed a means of inferring marine paleotemperatures over geologic time by measuring the oxygen isotope ratios of carbonates in marine sediments. When alpha particles are emitted as a spontaneous nuclear reaction, the radioactive material transmutates toward a more stable isotope or element. In 1961 the isotope carbon-12 was selected to replace oxygen as the standard relative to which the atomic weights of all the other elements are measured. When applied in a bioarchaeological context, stable strontium isotope analysis has been successfully used to provide information about human mobility. The compound was tagged with an isotope that temporarily gives off gamma rays detectable by a special kind of computerized tomography scanner. Chadwick was reluctant to move Tube Alloys there, believing that the United Kingdom was a better location for the isotope separation plant. The term isotope was coined by Margaret Todd as a suitable name for these elements. Deuterium compounds have applications in chemistry and biology in studies of reaction isotope effects. Such a pattern seems to fit the information on climate change found in oxygen isotope cores. However, this evidence can be confounded by other factors recorded by isotope ratios. Evidence obtained from stable isotope analysis shows plant foods, including cereals, formed only a small proportion of their dietary protein. The nucleus of a metastable isotope is in an excited state and will return to the ground state by emitting a photon in the form of a gamma ray. Stable and radioactive isotope studies provide insight into the geochemical evolution of rock units. Carbon and oxygen isotope ratios vary with time, and researchers can use those to map subtle changes that occurred in the paleoenvironment. This isotope has one unpaired proton and one unpaired neutron, so either the proton or the neutron can decay to the opposite particle. This can result in an explosion large enough to destroy a city if enough of the isotope is concentrated to form a critical mass. Show More Sentences Natural gas extraction also releases an isotope of radon, ranging in activity from 5 to 200,000 becquerels per cubic meter of gas. The provenance of ocean sediments can be determined by analysing terrigenous strontium isotope ratios in deep ocean cores. The cycles in the isotope ratio were found to correspond to terrestrial evidence of glacials and interglacials. Hacksilber objects in these Phoenician hoards have lead isotope ratios that match ores in Sardinia and Spain. Additionally, isotope ratios can provide much information about the ecological conditions under which extinct animals lived. Molecular fossils and isotope ratios represent two types of chemical fossils. The rocks are classified as Trondjemeitic Gneiss estimated to be 3,600 million years old, dated by rubidium isotope dating. Early replacive calcite and late replacive calcite exhibit similar carbon isotope and different oxygen isotope compositions. The use of sulfur isotope reconstruction is often paired with oxygen when a molecule contains both elements. The new Niton model features an X-ray tube rather than an isotope source, Anderson says. Late Paleocene Arctic coastal climate inferred from molluscan stable and radiogenic isotope ratios. Radioiodine is a radioactive isotope of iodine that is taken up and concentrated by the thyroid gland. Human mobility and the circulation of materials and objects through isotope geochemistry and archaeometry. Some of the earliest bind iodine-131, an isotope that emits low-energy gamma radiation along with a beta particle. For each atomic isotope, these beta particles emerge from nuclei with a characteristic distribution, or spectrum, of energies. Each microsphere is coated with a radioactive isotope which emits beta radiation. Selection of food sources by Ruditapes philippinarum and Mactra veneriformis determined from stable isotope analysis. Determination of sulfur as arsenic monosulfide ion by isotope dilution thermal ionization mass spectrometry. The plutonium used on space probes is not the Plutonium-239 isotope used in atomic bombs and built up as a byproduct in nuclear power plants. The contribution of fungus to the diets of three mycophagous marsupials in eucalyptus forests, revealed by stable isotope analysis. Show More Sentences After eight years, traces of the isotope are expected to be extremely low. Carbon isotope stratigraphy of the Devonian of Central and Southern Europe. The percentage refers to the relative amount of the U-235 uranium isotope, which is the necessary ingredient to sustain a nuclear chain reaction. Late Aeronian graptolite sedgwickii Event, associated carbon isotope excursion and facies changes in the Prague Synform. In the decay chains, both a previously unknown alpha-decay pathway in Db-270 and the new isotope Lr-266 were identified. Lu-Hf isotope systematics of fossil biogenic apatite and their effects on geochronology. These half-lives are at least 10 times longer than those previously observed for a seaborgium isotope. But it's got more plagioclase than they're seeing on the surface of Mercury and it plots funny in 'oxygen isotope space. Iodine-131, known as I-131, is a radioactive isotope commonly released after nuclear power plant disasters. Stable isotope and groundwater flow dynamics of agricultural irrigation recharge into groundwater resources of the Central Valley, California. He was the first to demonstrate mass dependent isotope fractionation of this element in nature and laboratory reactions. The initial systems market for isotope ratio mass spectrometers is almost completely a replacement market. Decay of the heavier isotope eventually produces dubnium, whereas the lighter isotope decays down to roentgenium. A radioactive isotope emits x-rays at a few discrete energy values. Hence, is a groupoid principal isotope of and is an isomorph of. After being incinerated, the femurs were analysed for the radioactive isotope strontium-90, which was being spread around the world by atmospheric nuclear tests. When using radionuclides, tracer biokinetics such as isotope affinity to fat tissue and diffusibility are known to bias blood flow values of the terminal capillary system. Strontium isotope analysis of the animal teeth showed that some had been brought from as far afield as the Scottish Highlands for the celebrations. Iranhas been enriching uranium to 20 per cent concentration of the fissile U-235 isotope since early 2010, stoking Western alarm over the nature of its nuclear programme. The team has analyzed the ratios of noble gas isotopes from deep within Earth's mantle, and has compared these results to isotope ratios closer to the surface. Show More Sentences This series of rapid acquisitions has positioned GV Instruments to be a major player in inorganic mass spectrometry, especially isotope ratio mass spectrometry. Hart is a geologist and isotope geochemist whose recent research has focused on the origin of hot spots and mantle plumes and on the dynamics and evolution of the deep Earth. These aspects include the identification of certain chemical components within the artefacts and the isotope analysis of Strontium and Lanthanides. I will cover three linked approaches, namely high precision analyses of nucleosynthetic isotope anomalies, radiogenic isotopes and trace elements. The most abundant iron isotope 56Fe is of particular interest to nuclear scientists because it represents the most common endpoint of nucleosynthesis. Cosmochemistry is the study of the chemicals found within the Solar System, including the origins of the elements and variations in the isotope ratios. A unique concentration in Phoenicia of silver hoards dated between 1200 and 800 BC, however, contains hacksilver with lead isotope ratios matching ores in Sardinia and Spain. The SPECMAP Project, funded by the US National Science Foundation, has produced one standard chronology for oxygen isotope records, although there are others. One kilogram of the isotope can generate about 570 watts of heat. The decay product resulting from electron capture is an isotope of copper. Gold has only one stable isotope, 197Au, which is also its only naturally occurring isotope, so gold is both a mononuclidic and monoisotopic element. This sort of graph is based on another of isotope ratio versus time. In addition, our tool determines the charge state of a peak by calculating the similarity between the peak shape of monoisotope and the peak shape of the second isotope peak. In Virginia, someone has created a homemade nuclear fusor from such high-tech items as salad bowls and a half a pint of hydrogen isotope bought online. Examples from Classical Literature Well, heavy water is made of one atom of oxygen plus two atoms of deuterium, which is the first isotope of hydrogen. An isotope is just a different variety of the ordinary kind of atom in each element. There must be another one in either wing, for the isotope plant and the cartridge-case plant. Find more words! 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Words that rhyme with isotope What is the past tense of isotope? What is the plural of isotope? What is the adverb for isotope? What is the adjective for isotope? What is the noun for isotope? Translations for isotope Use our Sentence Generator Nearby Words isotonic solution isotonicity isotonic isotherms isothermal isotherm isotopes isotopic isotopically isotretinoin isotron isotropic 7-letter Words Starting With i is iso isot isoto isotop