What is Cadmium 113 edge – Definition

113Cd has specific absorption cross-section with cut-off energy (Cadmium edge). Neutrons of kinetic energy below the cadmium cut-off energy (~0.5 eV) are strongly absorbed by 113Cd. Periodic Table
113Cd has specific absorption cross-section. There is a cadmium cut-off energy (Cadmium edge) in the absorption cross-section. Only neutrons of kinetic energy below the cadmium cut-off energy (~0.5 eV) are strongly absorbed by 113Cd. Therefore cadmium is widely used to absorb thermal neutrons in a thermal neutron filters.

n+_{48}^{113}textrm{Cd}  {rightarrow} _{48}^{114}textrm{Cd^{star}} rightarrow  _{48}^{114}textrm{Cd} +gamma

Cadmium cut-off energy
Neutrons of kinetic energy below the cadmium cut-off energy (~0.5 eV) are strongly absorbed by 113-Cd.
Source: JANIS (Java-based Nuclear Data Information Software); The JEFF-3.1 Nuclear Data Library

See also:

Cadmium

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