• High precision potassium isotope ratio measurements were made using a collision-cell equipped single focusing Multi-Collector Inductively Coupled Plasma Mass Spectrometer (MC-ICP-MS). Interferences on 41 K from 40 ArH + were largely suppressed through collision with He gas atoms, and reaction with H 2 or D 2 gas molecules in the collision cell under optimum collision gas flow conditions. (rsc.org)
  • The use of D 2 instead of H 2 as a reactive gas in the collision cell resulted in better overall performance in K isotope ratio measurements. (rsc.org)
  • In my mass spectrographic research on the abundance of the isotopes of potassium in nature I found that the 39K/41K ratio in ocean water was constant to at least 6 significant figures. (encognitive.com)
  • All these samples gave the same potassium isotope abundance ratio as embryonic tissues, that is 14.35. (encognitive.com)
  • There was material in the reactor that contained beryllium, and after being there a long while radiated with neutrons, somebody started trying to find out something about beryllium-10, so we separated the isotopes of beryllium-9 and 10, got very little of 10, of course, and then it was not anywhere near pure. (oclc.org)
  • With the improved precision, it is possible to distinguish a ∼1.3‰ variation in K isotope compositions ( 41 K/ 39 K ratios) among seawater, igneous rocks, and biological samples. (rsc.org)
  • Helium has a mass of four, and we don't say it has an isotope, but it has a nuclide which has a mass of four. (oclc.org)
  • It wasn't until the 1920s that Aston and Lindemann made an isotope separator and found there were two isotopes at least on neon. (oclc.org)
  • About 80% of standard smoke detectors contain a small amount of the radioactive isotope americium-241, which emits alpha particle and beta radiation. (thoughtco.com)
  • Potassium is a common element found in many materials, such as micas , clay minerals , tephra , and evaporites . (wikipedia.org)
  • In practice, each of these values may be expressed as a proportion of the total potassium present, as only relative, not absolute, quantities are required. (wikipedia.org)
  • They split them off in different directions, and they discovered that they were isotopes, and then they began looking for isotopes of other elements. (oclc.org)
  • For example, the potassium, which we have in our body, over time has one one-hundredth of a percent of potassium-40, which has a half-life of a billion years. (oclc.org)