16) Why is a moderator important for a fission chain reaction? (bonus) *
• It keeps neutrons from escaping the sample.
© It keeps neutrons from being absorbed by other isotopes.
• It allows neutrons to be absorbed by other fissionable nuclei.
• It provides enough fuel to make enough energy.
1 point
The correct answer is:
• It allows neutrons to be absorbed by other fissionable nuclei.
A moderator is important for a fission chain reaction because it slows down the fast-moving neutrons produced by the fission process. Slower neutrons are more likely to be absorbed by other fissionable nuclei, causing them to undergo nuclear fission and continue the chain reaction. Without a moderator, the chain reaction may not be sustainable.
Bonus:
A moderator does not necessarily keep neutrons from escaping the sample or being absorbed by other isotopes. And while providing enough fuel is important for sustaining a fission chain reaction, the primary role of a moderator is to slow down neutrons to allow for more efficient absorption by other fissionable nuclei.