absorption cross section वाक्य
उदाहरण वाक्य
मोबाइल
- It is made of a corrosion-resistant material with low absorption cross section for thermal neutrons, usually Zircaloy or steel in modern constructions, or magnesium with small amount of aluminium and other metals for the now-obsolete Magnox reactors.
- For that reason, the scattering and absorption cross sections " ? " " S " and " ? " " A " are defined and the total cross section is simply the sum of the two partial cross sections:
- Its neutron absorption barns, about 38 % of 149 Sm's absorption cross section, or about 20 times that of 235 U . Since the ratios between the production and absorption rates of 151 Sm and 149 Sm are almost equal, the two isotopes should reach similar equilibrium concentrations.
- Where x is the thickness of the material from the incident surface, ? = " n " ? is the absorption coefficient, measured in cm " 1, " n " the number of atoms per cm 3 of the material ( atomic density ) and ? the absorption cross section in cm 2.
- A composite scattering high-energy neutrons in the 14-MeV energy range and attenuating gamma rays, while the hydrogen in polyethylene is effective in slowing down these now slower fast neutrons in the few MeV range, and boron 10 has a high absorption cross section for thermal neutrons and a low production yield of gamma rays when it absorbs a neutron.
- Sr-90 and Cs-137, with half-lives of about 30 years, are the largest radiation ( including heat ) emitters in used nuclear fuel on a scale of decades to ~ 305 years ( Sn-121m is insignificant because of the low yield ), and are not easily transmuted because they have low neutron absorption cross sections.
- Deuterium's absorption cross section for thermal neutrons is 0.52 millibarns ( barn = 10 " 28 m 2, milli = 1 / 1000 ), while oxygen-16's is 0.19 millibarns and oxygen-17's is 0.24 barns . 17 O makes up 0.038 % of natural oxygen, making the overall cross section 0.28 millibarns.
- Quantitatively, the number " dN " of photons absorbed, between the points " x " and " x " + " dx " along the path of a beam is the product of the number " N " of photons penetrating to depth " x " times the number n of absorbing molecules per unit volume times the absorption cross section ?:
- Use of the isotope 15 N ( which constitutes around 0.37 % of natural nitrogen ) is preferable because the predominant isotope, 14 N, has a not insignificant neutron absorption cross section which affects neutron economy and, in particular, it undergoes an ( n, p ) reaction which produces significant amounts of radioactive 14 C which would need to be carefully contained and sequestered during reprocessing or permanent storage.
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