Thermal Neutron Population

Definition - What does Thermal Neutron Population mean?

Thermal Neutron Population is the rate at which thermal neutrons are produced because of fission process in a reactor and the rate at which loss of neutrons (or energy) happens in a reactor because of leakage in a system. No fission absorption mechanism takes place at any point of time during the nuclear reaction. Evaluation of thermal neutron population is important in order to measure the porosity of a formation reservoir.

Petropedia explains Thermal Neutron Population

The porosity of a reservoir can be measured with the help of thermal neutrons. This measurement of reservoir porosity based on thermal neutrons is known as neutron porosity. Porosity is generally referred to as the tiny pores, spaces or holes in a rock formation in which oil and gas can be accumulated. Thermal neutrons which are in stable state can penetrate into the pores of the formation rocks and are helpful in determining the porosity measurement of a rock. Higher porosity has more favorable chances of economic findings of hydrocarbons.

Thermal Neutrons are neutrons which are in thermal equilibrium with the ambient medium. These kinds of neutrons have a neutron speed of 2200 m/s at ambient temperature conditions of 293.6 Kelvin corresponding to energy of 0.0253 eV.
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