Distribution of Fission Energy

[Stephan_doc]

Hi all, according to following data pertain to energy release from fission:

Instantaneous Energy from Fission
Kinetic Energy of Fission Products 167 Mev
Energy of Fission Neutrons 5 MeV
Instantaneous Gamma-ray Energy 5 MeV
Capture Gamma-ray Energy 10 MeV
Total Instantaneous Energy 187 MeV
Delayed Energy from Fission
Beta Particles From Fission Products 7 Mev
Gamma-rays from Fission Products 6 MeV
Neutrinos 10 MeV
Total Delayed Energy 23 MeV

i can't understand why Capture Gamma-ray Energy is contained in fission energy.
I know that radiative capture is another nuclear reaction and captures to fissions ratio is
0.175.

Thank a lot

 

[Astronuc]

One accounts for recoverable thermal energy, since that is what must be removed from the core during a steady-state process such that fuel temperature is more or less constant. The energy in neutrinos is not recoverable.

Capture γs are mostly deposited in the fuel. In an LWR, most of the thermal energy is deposited in the ceramic fuel. That thermal energy must pass through the cladding and into the coolant. The coolant carries the thermal energy to a heat exchanger (steam generator) in a PWR, or directly to a steam turbine in a BWR.

 

[raining Pete]

for your explanation!


Hi there, great question! The reason why Capture Gamma-ray Energy is included in the total fission energy is because it is a byproduct of the fission process. When a nucleus splits during fission, it often results in the emission of gamma rays, which are high-energy photons. These gamma rays carry energy, which contributes to the overall energy released during fission.

As for the ratio of captures to fissions, this is referring to the ratio of radiative capture reactions to fission reactions. Radiative capture is a type of nuclear reaction where a nucleus captures a neutron and releases a gamma ray. This reaction can occur during the fission process, but it is not the main source of energy release. The majority of energy released during fission comes from the kinetic energy of the fission products and the energy of the fission neutrons.

I hope this helps clarify things for you. Let me know if you have any other questions. Thanks!