“Thermal imagery will show up objects radiating heat.”

“As the wood burns, chemical potential energy becomes kinetic energy like heat which can presumably radiate out of the fixed area of space you defined in your question.”

“In each drum, the circular plans minimize circulation to a small hall in the middle, from where individual student rooms radiate as wedges.”

“Having met some of his patients who have been given a new lease of life with replacement intra-ocular lenses, they simply radiate happiness.”