radiant energy, \(Q\)

https://doi.org/10.1351/goldbook.R05039
The total energy emitted, transferred or received as radiation in a defined period of time (\(Q=\int Q_{\lambda } \ \mathrm{d}\lambda \)). It is the product of radiant power, \(P\), and time, \(t\): \(Q=P\ t\) when the radiant power is constant over the time considered.
Sources:
Green Book,2nd ed., p. 30 (https://www.cintegrado.com.br/site/documentos/green_book_2ed.pdf)
ISO, 31-5 (http://www.iso.org/iso/catalogue_detail.htm?csnumber=3635)
PAC, 1996, 68, 2223. 'Glossary of terms used in photochemistry (IUPAC Recommendations 1996)' on page 2268 (https://doi.org/10.1351/pac199668122223)
PAC, 1996, 68, 957. 'Glossary of terms in quantities and units in Clinical Chemistry (IUPAC-IFCC Recommendations 1996)' on page 988 (https://doi.org/10.1351/pac199668040957)