In radiometry, $\textit{Radiant Energy}$ is the energy of electromagnetic waves.
The quantity of radiant energy may be calculated by integrating radiant flux (or power) with respect to time.
In nuclear physics, $\textit{Radiant Energy}$ is energy, excluding rest energy, of the particles that are emitted, transferred, or received.
Applicable units are those of quantitykind:Energy
http://en.wikipedia.org/wiki/Radiant_energy
In radiometry,"Radiant Energy} is the energy of electromagnetic waves. The quantity of radiant energy may be calculated by integrating radiant flux (or power) with respect to time. In nuclear physics, $\textit{Radiant Energy" is energy, excluding rest energy, of the particles that are emitted, transferred, or received.
http://www.iso.org/iso/catalogue_detail?csnumber=31895