Uranium-235 (U-235), radioactive isotope of the element uranium with a nucleus containing 92 protons and 143 neutrons. Uranium-235 is the only naturally occurring fissile material; that is, the uranium-235 nucleus undergoes nuclear fission when it collid
The half-life of Cshas been measured by observing the rate of growth of stable Bafrom a known quantity of Csby the use of isotope dilution mass spectrometr... BF Rider,JP Peterson,CP Ruiz - 《Nuclear Science & Engineering the Journal of the American Nuclear Society》 ...
It was the first fissile Uranium isotope to be discovered. When one neutron from the U-235 fission reaction causes another nucleus of this metal to undergo fission, it causes the entire chain reaction to continue. This condition is called the “critical condition” while the mass of U-235 re...
As an intermediate link, the U/U half-life ratio was taken from published mass spectrometric analyses of 'secular equilibrium' uranium material. The resulting half-life ratio (U)/ (U) = 6.351卤0.031 is in agreement with the commonly adopted half-life values determined by Jaffey et al.doi:...
As can be seen fromFigure 1a, for the majority of the plotted isotopes (94 out of 120) the half-life is known with less than 5% uncertainty. There are some notable exceptions that are partially denoted in the figure or are not given at all, i.e. for186mRe,250Cm and248Bk values hav...
As an intermediate link, the 234U/238U half-life ratio was taken from published mass spectrometric analyses of 'secular equilibrium' uranium material. The resulting half-life ratio T 1/2(238U)/T 1/2(235U) = 6.351±0.031 is in agreement with the commonly adopted half-life values determined...
U/U activity ratios as a probe for the U/U half-life ratio High-resolution alpha-particle spectrometry was performed on three uranium materials enriched in U. Besides the U peaks, separate peaks belonging to impuri... S. Pommé,E. García-Tora?o,G. Sibbens,... - 《Journal of Radioanal...
To make nuclear fuel from the uranium ore requires first for the uranium to be extracted from the rock in which it is found, then enriched in the uranium-235 isotope, before being made into pellets that are loaded into assemblies of nuclear fuel rods. Mining Uranium mines operate in some...
The value of λ-or inversely the half-life T1/2 = ln(2)/λ-is invariable in space and time, in spite of recent claims of variability in decay rate measurements erroneously ascribed to solar influences [2–11]. Accurate values for the decay constant or half-life of trans-uranium ...
Relying on the isotopic composition of the uranium, as determined by mass spectrometry, the ratio of the half-lives of 238U and 235U was determined via the activity ratio of 234U and 235U in the materials. As an intermediate link, the 234U/238U half-life ratio was taken from published ...