It is now known that density of water also depends on the isotopic ratios of the oxygen and hydrogen atoms in a particular sample.
32.
This dating method is based on an isochron calculated based on isotopic ratios measured using N-TIMS ( Negative Thermal Ionization Mass Spectrometry ).
33.
Investigating lunar samples carried to Earth by the Apollo 15 and 17 missions found a deuterium-to-hydrogen ratio that matched the isotopic ratio in carbonaceous chondrites.
34.
The researchers probed the diet of the Neanderthal by measuring the isotopic ratios of nitrogen in skulls and jawbones recovered from a cave in Croatia.
35.
The cometary and asteroidal delivery of water to accreting Earth and Mars has significant caveats, even though it is favored by D / H isotopic ratios.
36.
Improved SIMS experiments showed that the silicon isotopes within each SiC grain did not have solar isotopic ratios but rather those expected in certain red-giant stars.
37.
Of particular interest, Manfred Schidlowski argued in 1979 that the carbon isotopic ratios of some sedimentary rocks found in Greenland were a relic of organic matter.
38.
The isotopic ratio of [ 12 C ] / [ 13 C ] was determined to be about or less than 50 % in the galactic disk.
39.
Monazite geochronology studies the ratio of parent isotopes to daughter isotopes ( isotopic ratio ), and calculates how much time has passed since daughter isotopes start accumulating.
40.
Because the different isotopes of lead have half-lives of 50 200 years, there is not enough time for the isotopic ratios to be homogenized throughout the whole ocean.
