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Oxygen-15 is a radioisotope, often used in positron emission tomography (PET). It can be used in, among other things, water for PET myocardial perfusion imaging and for brain imaging. [ 20 ] [ 21 ] It has an atomic mass of 15.003 0656 (5) , and a half-life of 122.266(43) s .
Oxygen-15 labelled water (also known as 15 O-water, [O-15]-H 2 O, or H 2 15 O) is a radioactive variation of regular water, in which the oxygen atom has been replaced by oxygen-15 (15 O), a positron-emitting isotope. 15 O-water is used as a radioactive tracer for measuring and quantifying blood flow using positron emission tomography (PET) in ...
This is a list of radioactive nuclides (sometimes also called isotopes), ordered by half-life from shortest to longest, in seconds, minutes, hours, days and years. Current methods make it difficult to measure half-lives between approximately 10 −19 and 10 −10 seconds.
Isotopes neighbor each other vertically. Examples include carbon-12, carbon-13, and carbon-14 in the table above. Isotones are nuclides with the same number of neutrons but differing numbers of protons. Isotones neighbor each other horizontally. Examples include carbon-14, nitrogen-15, and oxygen-16 in the table above.
15 N: 16 O: 99.8% stable: 17 O: 0.0380% stable 18 O: 0.205% stable Standard atomic weight A r °(O) ... Main isotopes of oxygen; Main isotopes Decay; abundance half ...
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Oxygen (chemical symbol O) has three naturally occurring isotopes: 16 O, 17 O, and 18 O, where the 16, 17 and 18 refer to the atomic mass.The most abundant is 16 O, with a small percentage of 18 O and an even smaller percentage of 17 O. Oxygen isotope analysis considers only the ratio of 18 O to 16 O present in a sample.
A 5-year-old child had to be disarmed by police after answering the front door holding a loaded handgun in Michigan. The child opened the front door carrying the armed weapon to a cadet who came ...