Tritium 3 H or T is the radioactive isotope of hydrogen that decays with a half life of Tritium is produced naturally in the upper atmosphere by interaction of nitrogen, and, to a lesser extent, oxygen with cosmic rays. After oxidation to HTO, it takes part in the natural water cycle. These tests which were mainly performed in the early s, led to an increase of tritium in precipitation over the continents of the northern hemisphere from roughly 5 TU to levels of the order of TU. One TU Tritium Unit means a tritium to hydrogen ratio of 10
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Radiometric Age Dating - Geology (U.S. National Park Service)
Radiometric dating calculates an age in years for geologic materials by measuring the presence of a short-life radioactive element, e. The term applies to all methods of age determination based on nuclear decay of naturally occurring radioactive isotopes. Bates and Jackson To determine the ages in years of Earth materials and the timing of geologic events such as exhumation and subduction, geologists utilize the process of radiometric decay. Geologists use these dates to further define the boundaries of the geologic periods shown on the geologic time scale. Radiometric decay occurs when the nucleus of a radioactive atom spontaneously transforms into an atomic nucleus of a different, more stable isotope. This transformation happens via the emission of particles such as electrons known as beta decay and alpha particles. For instance, rubidium 87Rb , an unstable element, becomes strontium 87Sr , a stable element, via beta decay.
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The normal serum creatinine reference interval does not necessarily reflect a normal GFR for a patient. Because mild and moderate kidney injury is poorly inferred from serum creatinine alone, NIDDK strongly encourages clinical laboratories to routinely estimate glomerular filtration rate GFR and report the value when serum creatinine is measured for patients 18 and older, when appropriate and feasible. An estimated GFR eGFR calculated from serum creatinine using an isotope dilution mass spectrometry IDMS traceable equation is a simple and effective way in which laboratories can help health care providers detect CKD among those with risk factors—diabetes, hypertension, cardiovascular disease, or family history of kidney disease. Assessment of kidney function through eGFR is essential once albuminuria is discovered.