Nuclear Criticality Safety Engineer Training Module 1: Introductory Nuclear Criticality Physics
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Questions and Answers

What is the calculated atomic weight of uranium in the uranium oxide compound?

  • 238.0508 g/mole
  • 235.2519 g/mole (correct)
  • 235.0439 g/mole
  • 15.9994 g/mole

    • Based on the given information, which element has the highest atom density?

  • Fe (correct)
  • C
  • Ni
  • Cr

    • What is the total macroscopic cross section for Cr?

  • 0.1798
  • 0.1116 (correct)
  • 0.0531
  • 0.0585

    • If the atom density of Ni is 0.008065, what is the scattering macroscopic cross section for Ni?

    <p>0.0362</p> Signup and view all the answers

    Calculate the weight fraction of uranium (U) in the uranium oxide compound.

    <p>0.81865</p> Signup and view all the answers

    How do you define the macroscopic cross section in nuclear physics?

    <p>The product of atom density and microscopic cross section</p> Signup and view all the answers

    What is the primary focus of the American National Standard for Nuclear Criticality Safety?

    <p>Protection against the consequences of an inadvertent nuclear chain reaction</p> Signup and view all the answers

    What does the term 'criticality' refer to in the context of nuclear reactions?

    <p>Whether the reaction can be controlled and if it will run by itself</p> Signup and view all the answers

    What is the definition of nuclear energy?

    <p>Energy produced by a nuclear reaction</p> Signup and view all the answers

    What is the definition of a fissile nuclide?

    <p>A nuclide that can undergo nuclear fission with thermal neutrons</p> Signup and view all the answers

    What is the definition of nuclear criticality safety?

    <p>Protection against the consequences of an inadvertent nuclear chain reaction</p> Signup and view all the answers

    What is the definition of work in the context of nuclear energy?

    <p>Force times distance</p> Signup and view all the answers

    What is the approximate energy needed to induce fission in 238U?

    <p>1 MeV</p> Signup and view all the answers

    Which isotope has the most stable configuration?

    <p>236 Np</p> Signup and view all the answers

    Which isotope has an odd-odd nucleus type?

    <p>236 Np</p> Signup and view all the answers

    Which isotope readily accepts a neutron?

    <p>235U</p> Signup and view all the answers

    Which isotope has an even-even nucleus type with 94 protons?

    <p>240 Pu</p> Signup and view all the answers

    Which isotope does not need a neutron to go to a more tightly bound state?

    <p>238U</p> Signup and view all the answers

    What is the microscopic cross section defined as?

    <p>The effective area of the nucleus for certain types of collisions with neutrons</p> Signup and view all the answers

    What is the relationship between the microscopic cross section (σ), atom density (N), and the macroscopic cross section (Σ)?

    <p>Σ = N * σ</p> Signup and view all the answers

    What is the total cross section of a material?

    <p>The effectiveness of the material in removing neutrons from an incident beam of neutrons</p> Signup and view all the answers

    What is the intensity of the beam emerging from a target of thickness x, given an incident beam of neutrons with intensity I0 and a macroscopic cross section Σ?

    <p>I(x) = I0 * e^(-Σx)</p> Signup and view all the answers

    What is the atomic weight of the plutonium metal in the given text?

    <p>239.199 g</p> Signup and view all the answers

    What is the difference between weight-fraction and atom-fraction, and why is it important in criticality safety calculations?

    <p>Weight-fraction and atom-fraction are different, and their difference is important in criticality safety calculations</p> Signup and view all the answers

    What is the macroscopic cross section of a uranium metal sample consisting of only 235U and 238U?

    <p>Σ = N235 σ 235 + N238 σ 238</p> Signup and view all the answers

    What is the mass of one atomic mass unit in grams?

    <p>1.6606 x 10^-24 g</p> Signup and view all the answers

    What is the energy released when one atomic mass unit is converted to energy?

    <p>931.50 MeV</p> Signup and view all the answers

    What is the difference in mass between a neutron and a hydrogen atom?

    <p>0.782 amu</p> Signup and view all the answers

    What is the process of fission?

    <p>A nucleus splits into two or three fragments</p> Signup and view all the answers

    What is the half-life of a free neutron?

    <p>10.4 minutes</p> Signup and view all the answers

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