Nuclear Engineering Principles 3

How many protons, neutrons and electrons are in Cf-252 (Z = 98) ?

• Protons: 98, Neutrons: 150, Electrons: 96
• Protons: 100, Neutrons: 152, Electrons: 98
• Protons: 98, Neutrons: 154, Electrons: 98
• Protons: 96, Neutrons: 156, Electrons: 98

What percentage of natural U is fissile U-235?

• 0.7%
• 0.1%
• 5%
• 1.5%

Which type of ionising radiation is also electromagnetic radiation?

• Alpha particles
• Beta particles
• Neutrons

• Gamma rays

Which element's nucleus is an alpha particle?

• Hydrogen
• Oxygen
• Helium
• Carbon

What is a beta particle?

• A beta particle is a type of alpha particle.
• A beta particle is a form of electromagnetic radiation.
• A beta particle is an electron or positron emitted during radioactive decay.
• A beta particle is a neutron emitted during decay.

Match the type of radiation to suitable shielding.

• Water or concrete

• Alpha

• Thin sheet of aluminium

• Gamma

• Thick lead

• Neutron

• Paper

• Beta

Which type of ionising radiation is the most ionising?

• Beta particles
• Gamma rays
• Neutrons
• Alpha particles

Which decay equation is a correct example of an alpha decay?

• 238U → 234Th + 4He
• 238U → 238Pu + 4He
• 234Th → 230Ra + 4He
• 238U → 235U + 4He

Which decay equation is a correct example of a beta decay?

• 14C -> 14N + e- + ν̅
• 14C -> 14O + e- + ν̅
• 14C + e- -> 14N
• 14C -> 14N + α

What is the SI unit for activity?

• Coulomb (C)

• Joule (J)

• Hertz (Hz)

• Becquerel (Bq)