Search results
Results from the WOW.Com Content Network
All the remaining ones have half-lives ranging from 30 minutes to less than a millisecond. [16] The neutron capture product of fermium-257, 258 Fm, undergoes spontaneous fission with a half-life of just 370(14) microseconds; 259 Fm and 260 Fm also undergo spontaneous fission (t 1/2 = 1.5(3) s and 4 ms respectively). [16]
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.
Suppose multiple fermions have the same spatial probability distribution, then, at least one property of each fermion, such as its spin, must be different. Fermions are usually associated with matter, whereas bosons are generally force carrier particles. However, in the current state of particle physics, the distinction between the two concepts ...
As it is normal to allow used nuclear fuel to stand for about five years before reprocessing, much of this activity will decay away leaving 4.7 MBq of 102 Rh and 5.0 MBq of 102m Rh. If the rhodium metal was then left for 20 years after fission, the 13.3 grams of rhodium metal would contain 1.3 kBq of 102 Rh and 500 kBq of 102m Rh.
Created Date: 8/30/2012 4:52:52 PM
In 1970, South Africa produced 995 tonnes or 32 million ounces of gold, two-thirds of the world's production of 47.5 million ounces. [2] Production figures are for primary mine production. In the US, for example, for the year 2011, secondary sources (new and old scrap) exceeded primary production. [3]
Its density of 8.84 g/cm 3 is lower than that of californium (15.1 g/cm 3) and is nearly the same as that of holmium (8.79 g/cm 3), despite einsteinium being much heavier per atom than holmium. Einsteinium's melting point (860 °C) is also relatively low – below californium (900 °C), fermium (1527 °C) and holmium (1461 °C).
It can only be produced in particle accelerators by bombarding lighter elements with charged particles. Seventeen isotopes are known; the most stable is 258 Md with half-life 51.59 days; however, the shorter-lived 256 Md (half-life 77.7 minutes) is most commonly used in chemistry because it can be produced on a larger scale.