This chain reaction produces many intermediate radioactive mass fragments that are capable of producing energy by undergoing radioactive decay themselves. In these cases, the neutrons are moderated to lower their speed in the reaction as the chances of fission are greater with slow neutrons than with fast neutrons. It is possible to achieve a critical chain reaction with a low concentration of U-235. This condition is called the “critical condition” while the mass of U-235 required to produce this condition is called “critical mass”. 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. It was the first fissile Uranium isotope to be discovered. ![]() This radioactive isotope takes 703,800,000 years to decay and reduce to half of its initial amount. Here is the complete decay series of this isotope: It produces Lead as the final stable element of this Alpha decay chain. ![]() Uranium-235 is also known as Actinouranium as it is the parent isotope of the Actinium Series. It makes Thorium-231 the daughter nuclide of this isotope. The decay chain of this radioactive metal is known as the Actinium Series with thorium-231 being the next isotope in this decay process. Uranium-235 undergoes spontaneous fission during radioactive decay however, no standard equation can represent this reaction as its results are quite unpredictable. Here, the He ( Helium) is representing one Alpha (α) particle. Uranium-235 Decay Equationįollowing is one decay equation for the Alpha decay of this isotope: It undergoes Alpha decay by radiating Alpha Rays (α) with decay energy of 4.679 MeV. The unstable nucleus of this radioactive isotope loses energy by emitting ionizing particles for reaching a stable state. There are 92 protons and 143 neutrons in the nucleus of one isotope of this radioactive metal. Molecular Weight: The molecular weight of this metal is 235.044 g/mol.Ītomic Number: The atomic number for this metal is 92.Ītomic Mass: Its mass number is 235.0439299 u (unified atomic mass units).Ĭritical Mass: The critical mass for this radioactive isotope is 52 kg.Ĭritical Diameter: Its critical diameter is 17 cm. This fissile material has the following properties:Īppearance: It is a silver-colored metal. Picture 1 – Uranium-235 Properties of Uranium-235 The symbol or formula for this radioactive isotope is 235U. Highly enriched Uranium may contain up to 40% Uranium-235. Uranium-235 is separated from Uranium-238 following the diffusion process using Uranium Hexafluoride (UF 6) gas. Uranium-235 IdentificationĪrthur Jeffrey Dempster was the first person to discover this radioactive metal isotope in 1935.Uranium-235 makes up around 0.72% of the total Uranium found in nature with Uranium-238 (another radioactive isotope)making up above 99% of the remaining mass of the metal. Uranium-235 is the only fissile radioactive isotope which is a primordial nuclide existing in nature in its present form since before the creation of Earth. It is the only fissile Uranium isotope being able to sustain nuclear fission. Uranium-235 is a naturally occurring isotope of Uranium metal.
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