Ne-22 how many neutrons
Uranium-235 is the isotope of the chemical element uranium, whose atomic nucleus consists of 143 neutrons and the 92 protons characteristic of this element; this results in the mass number 235.
Uranium-235 was discovered in 1935 by Arthur Jeffrey Dempster - a Canadian-American physicist. It is the only fissile isotope that occurs naturally as a (primordial) primordial nuclide. The cross section for slow thermal neutrons is about 584.3 ± 1 barn; for fast neutrons this is of the order of a barn. The fission of a uranium-235 atom sets 202.5 MeV or 3.24 × 10 in the nuclear reactor-11 J, which corresponds to 19.54 TJ / mol or 83.14 TJ / kg. Another 8.8 MeV escape as anti-neutrinos.
Bombarding U-235 nuclides with neutrons triggers many different fission reactions - such as:
10n + 23592U → 14156Ba + 9236Kr + 3 10n.
See also: Overview of the uranium isotopes.
Uranium-235 is the starting nuclide of the so-called uranium-actinium series - (4n + 3) series - which in English-speaking countries is often referred to as the actinium series or actinium cascade and which ends in the stable lead isotope Pb-207 Has.
Half-life half-life = 7,04(1) × 108 Years or. 2,2201344 × 1016 Seconds s.
|Decay||product||proportion of||Decay energy||γ energy|
|α to||231Th||approx. 100%||4.6780 (7) MeV|
Uranium-235 gamma emissions
|E.γ||I.γ||Dose (MeV / Bq-s)|
|143.76 (2) keV||10,96(14) %||0,01576(20)|
|163.356 (3) keV||5,08(6) %||0,00830(11)|
|185.715 (5) keV||57,0(6) %||0,1059(12)|
|205.316 (10) keV||5,02(6) %||0,01031(12)|
Interfering nuclides in the gamma spectrometric determination: Ra-223 (Eγ = 144.27 keV; I.γ = 3.36%); Ra-226 (E.γ = 186.21 keV; I.γ = 3,56 %).
Among the large number of gamma lines caused by the U-235 in the gamma spectrum, the table only lists those whose intensities Iγ are greater than 5 percent.
The figure shows the natural decay scheme (uranium-235 decay series) for the nuclide uranium-235 - also called uranium-actinium decay series - whose end point is the stable lead nuclide Pb-207.
Direct mother nuclides are: 239Pooh, 235Np, 235Pa.
Natural occurrenceComparison of the natural uranium isotopes including isotope frequency (proportion of the isotope mixture):
|Atomic mass Ar||proportion of||Half-life||Spin|
|238.02891 u||100 %|
|isotope 234U||234.04095 (2) et al||0,0054(5) %||2,455(6) × 105 Years||0+|
|isotope 235U||235.04393 (2) and||0,7204(6) %||7,04(1) × 108 Years||7/2-|
|isotope 238U||238.05079 (2) et al||99,2742(10) %||4,468(6) × 109 Years||0+|
235U is one of the NMR-active nuclides.
The Radiation Protection Ordinance (StrlSchV) lists the following exemption limits, clearance values and other values as a radioactive or highly radioactive radiation source for the isotope uranium-235 (further data, explanations: see there):
Nuclear isomeric nuclides or excited states with the activation energy related to the ground state in keV.
|description||Excitation energy||Half-life||Nuclear spin|
|235mU||0.0760 (4) keV||approx. 26 minutes||1/2+|
|235m2U||2500 (300) keV||3.6 (19) ms|
Isotonic and isobaric nucleiThe following table shows isotonic (same number of neutrons N = 143) and isobaric (same number of nucleons A = 235) atomic nuclei for the nuclide uranium-235. Naturally occurring isotopes are marked in green; light green = radionuclides.
|OZ||Isotons N = 143||Isobar A = 235|
|95||238At the||235At the|
External data and identifiers
last changes at 15.03.2021.
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