What are the two types of neutron radiation?

What are the two types of neutron radiation?

• A. fast and slow
• B. prompt and delayed
• C. primary and secondary
• D. internal and external

Answer: (B)

Neutrons produced in fission come in two timing categories: prompt neutrons are emitted immediately at the moment of fission, while delayed neutrons appear later as certain fission fragments decay and release neutrons. This timing difference is crucial because delayed neutrons provide a slower, controllable response in a reactor, making it possible to manage the chain reaction with control rods and other systems. The other terms describe different ideas. Fast and slow refer to neutron energy, not when they’re emitted. Primary and secondary, or internal and external, aren’t standard classifications for neutron radiation types in this context.

Neutrons produced in fission come in two timing categories: prompt neutrons are emitted immediately at the moment of fission, while delayed neutrons appear later as certain fission fragments decay and release neutrons. This timing difference is crucial because delayed neutrons provide a slower, controllable response in a reactor, making it possible to manage the chain reaction with control rods and other systems.

The other terms describe different ideas. Fast and slow refer to neutron energy, not when they’re emitted. Primary and secondary, or internal and external, aren’t standard classifications for neutron radiation types in this context.