30 Questions
What is the calculated atomic weight of uranium in the uranium oxide compound?
235.2519 g/mole
Based on the given information, which element has the highest atom density?
Fe
What is the total macroscopic cross section for Cr?
0.1116
If the atom density of Ni is 0.008065, what is the scattering macroscopic cross section for Ni?
0.0362
Calculate the weight fraction of uranium (U) in the uranium oxide compound.
0.81865
How do you define the macroscopic cross section in nuclear physics?
The product of atom density and microscopic cross section
What is the primary focus of the American National Standard for Nuclear Criticality Safety?
Protection against the consequences of an inadvertent nuclear chain reaction
What does the term 'criticality' refer to in the context of nuclear reactions?
Whether the reaction can be controlled and if it will run by itself
What is the definition of nuclear energy?
Energy produced by a nuclear reaction
What is the definition of a fissile nuclide?
A nuclide that can undergo nuclear fission with thermal neutrons
What is the definition of nuclear criticality safety?
Protection against the consequences of an inadvertent nuclear chain reaction
What is the definition of work in the context of nuclear energy?
Force times distance
What is the approximate energy needed to induce fission in 238U?
1 MeV
Which isotope has the most stable configuration?
236 Np
Which isotope has an odd-odd nucleus type?
236 Np
Which isotope readily accepts a neutron?
235U
Which isotope has an even-even nucleus type with 94 protons?
240 Pu
Which isotope does not need a neutron to go to a more tightly bound state?
238U
What is the microscopic cross section defined as?
The effective area of the nucleus for certain types of collisions with neutrons
What is the relationship between the microscopic cross section (σ), atom density (N), and the macroscopic cross section (Σ)?
Σ = N * σ
What is the total cross section of a material?
The effectiveness of the material in removing neutrons from an incident beam of neutrons
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?
I(x) = I0 * e^(-Σx)
What is the atomic weight of the plutonium metal in the given text?
239.199 g
What is the difference between weight-fraction and atom-fraction, and why is it important in criticality safety calculations?
Weight-fraction and atom-fraction are different, and their difference is important in criticality safety calculations
What is the macroscopic cross section of a uranium metal sample consisting of only 235U and 238U?
Σ = N235 σ 235 + N238 σ 238
What is the mass of one atomic mass unit in grams?
1.6606 x 10^-24 g
What is the energy released when one atomic mass unit is converted to energy?
931.50 MeV
What is the difference in mass between a neutron and a hydrogen atom?
0.782 amu
What is the process of fission?
A nucleus splits into two or three fragments
What is the half-life of a free neutron?
10.4 minutes
This training module covers the basic concepts of moles, atom densities, cross sections, nuclear fission, and definitions of fissile and fissionable nuclides for engineers and scientists without a nuclear engineering background. Learn about nuclear energy release and the mechanics of nuclear fission.
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