Oxygen-18 (18 O, Ω [1]) is a natural, stable isotope of oxygen and one of the environmental isotopes. 18 O is an important precursor for the production of fluorodeoxyglucose (FDG) used in positron emission tomography (PET). Generally, in the …

氧-18，為氧的同位素，有8個質子和10個中子，在氧化態為0時，則有8個電子，豐度為大約0.21%，佔地殼含量約0.1%。 18 o 是生产氟代脱氧葡萄糖 (fdg) 的原料，后者可用于正电子发射计算机断层扫描 (pet)。

Oxygen-18 is a stable isotope of the chemical element oxygen, which has 10 neutrons in its atomic nucleus in addition to the element-specific 8 protons; the sum of the number of these atomic nucleus building blocks results in a mass number of 18.

Oxygen-18 in the water or gaseous form serves as a source for short-lived positron-emitting isotope fluorine-18, which allows tracking the processes of cerebral blood flow, glucose metabolism in the central nervous and cardiovascular systems, evaluating the impact of drugs on neuroreceptors. 18F is also used in brain imaging.

“Light” oxygen-16, with 8 protons and 8 neutrons, is the most common isotope found in nature, followed by much lesser amounts of “heavy” oxygen-18, with 8 protons and 10 neutrons. The ratio (relative amount) of these two types of oxygen in water changes with the climate.

在代谢研究中，通常采用氧-18来代替普通 氧 进行 同位素示踪 ，可以灵敏、准确、快捷地搞清药物在机体内活动规律、代谢途径。这种示踪研究对于开发新药是必不可少的，对于指导药物的人体内应用有十分重要的意义。

Oxygen-16 is the dominant isotope, making up more than 99 percent of all natural oxygen; oxygen-18 makes up 0.2 percent. However, the exact concentration of oxygen-18 in precipitation, particularly at high latitudes, depends on the temperature. Winter snow has a smaller oxygen-18–oxygen-16… Read More; isotopic fractionation. In isotopic ...

2025年3月17日 · 氧-18是生产用于正电子发射断层扫描 (PET)的氟脱氧葡萄糖 (FDG)的重要前体。 一般来说，在放射性制药工业中，浓缩水 (H 218 O)在回旋加速器或线性加速器中与氢离子轰击，产生氟-18。 然后合成FDG并注射到患者体内。 当与氚 (氢-3)结合时，它也可以被用来制造一种极重的水： 3 H 218 O或T 218 O。 它也主要被用为同位素追踪。 ChemicalBook 致力于为化学行业用户提供氧-18的性质、化学式、分子式、比重、密度,同时也包括氧-18的沸点、熔点 …

2022年12月6日 · Oxygen has three stable isotopes: oxygen-16, oxygen-17, and oxygen-18. In most studies on terrestrial samples, only the 18 O/ 16 O ratio is usually measured and discussed, where the mass-dependent fractionation law, expressed by δ 17 O ≈ 0.52 × δ 18 O, can be safely assumed (see Delta, Isotopic, for the δ notation).

Oxygen-18 O 2 can be used to study the kinetic and functional analyses in photosynthesis research.It is used to estimate the role of oxygen in the vitamin-K dependent carboxylation reaction. Also used to measure the amount of oxygen produced by the etching a …