International Gold Number of Neutrons
The international gold number of neutrons (IGNN), also known as the international gold number (IGN), is a measure of the number of neutrons per gram of gold. It is used to quantify the neutron absorption properties of gold and is important in nuclear physics and radiation protection.
The IGNN is defined as the number of neutrons that are absorbed by one gram of gold per second when the neutrons have a kinetic energy of 0.0253 eV (electron volts). This energy corresponds to the thermal neutron energy range, which is important for nuclear reactions.
The IGNN is a constant and its value is approximately 1.354 ± 0.001 barns per gram. A barn is a unit of area commonly used to measure the cross section of nuclear reactions. The cross section is a measure of the probability that a nuclear reaction will occur when a neutron interacts with a nucleus.
The IGNN is used in a variety of applications, including:
* Nuclear reactor design: The IGNN is used to calculate the neutron absorption rate in nuclear reactors. This information is important for determining the criticality of the reactor and for designing reactor shielding.
* Radiation protection: The IGNN is used to estimate the neutron dose received by individuals working with radioactive materials. This information is important for ensuring the safety of radiation workers.
* Medical imaging: The IGNN is used in neutron radiography, which is a medical imaging technique that uses neutrons to create images of the body.
The IGNN is an important quantity in nuclear physics and radiation protection. It is used in a variety of applications, including nuclear reactor design, radiation protection, and medical imaging.
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