Table of Contents
- 1 How many years would it take half of the rubidium?
- 2 What is the half-life of SM 147?
- 3 How long is the half-life of oxygen?
- 4 Which isotope would be best to date the oldest rock on Earth?
- 5 Is ND 142 radioactive?
- 6 What is the half-life of samarium?
- 7 What is the longest decay chain?
- 8 Is oxygen 16 stable or unstable?
How many years would it take half of the rubidium?
The method is applicable to very old rocks because the transformation is extremely slow: the half-life, or time required for half the initial quantity of rubidium-87 to disappear, is approximately 50 billion years.
What is the half-life of SM 147?
List of isotopes
| Nuclide | Z | Half-life |
|---|---|---|
| Excitation energy | ||
| 147Sm | 62 | 1.06(2)×1011 y |
| 148Sm | 62 | 7(3)×1015 y |
| 149Sm | 62 | Observationally Stable |
What is the longest half-life?
about 18 sextillion years
The half-life of xenon-124 — that is, the average time required for a group of xenon-124 atoms to diminish by half — is about 18 sextillion years (1.8 x 10^22 years), roughly 1 trillion times the current age of the universe. This marks the single longest half-life ever directly measured in a lab, Wittweg added.
How long is the half-life of oxygen?
Isotopes
| unstable isotopes | ||
|---|---|---|
| mass | half-life | |
| oxygen | 20 | 13.51 seconds |
| 21 | 3.42 seconds | |
| 22 | 2.25 seconds |
Which isotope would be best to date the oldest rock on Earth?
The best-known radiometric dating method involves the isotope carbon-14, with a half life of 5,730 years.
What percentage of rubidium-87 will be left after four half lives?
Since 25% of the Rubidium-87 remains, approximately two half-lives have passed. After one half-life about 50% remains, and after a second half-life 50% of that 50% which is 25% remains.
Is ND 142 radioactive?
The radioactive decay of 147Sm into 143Nd and 146Sm into 142Nd through time has produced variations in Nd isotope ratios in terrestrial and extraterrestrial materials.
What is the half-life of samarium?
46.3 hours
Samarium 153 is a man-made radionuclide that emits beta particles of 0.81 MeV (20%), 0.71 MeV (30%), and 0.64 MeV (50%) and gamma photons of 103 keV (28%). It has a relatively short half-life of 46.3 hours and, consequently, a relatively high dose-rate.
What material has the shortest half-life?
Uranium-234 has the shortest half-life of them all at 245,500 years, but it occurs only indirectly from the decay of U-238. In comparison, the most radioactive element is polonium. It has a half-life of a mere 138 days. Still, uranium has explosive potential, thanks to its ability to sustain a nuclear chain reaction.
What is the longest decay chain?
Bismuth-209 was long thought to have the heaviest stable nucleus of any element, but in 2003, a research team at the Institut d’Astrophysique Spatiale in Orsay, France, discovered that 209Bi undergoes alpha decay with a half-life of approximately 19 exayears (1.9×1019, approximately 19 quintillion years), over a …
Is oxygen 16 stable or unstable?
Oxygen-16 (16O) is a stable isotope of oxygen, having 8 neutrons and 8 protons in its nucleus. It has a mass of 15.99491461956 u. Oxygen-16 is the most abundant isotope of oxygen and accounts for 99.762% of oxygen’s natural abundance.
Is oxygen 17 stable or unstable?
There are three known stable isotopes of oxygen (8O): 16O, 17O, and 18O.