"If there is any radiation present, it may show up as a faint luminescence."

The plane was given a faint blue luminescence, and it was quite visible.

Almost immediately, the stains gave off a faint blue luminescence.

Some were partly filled, their contents giving off a faint green luminescence.

They were drifting toward a curtain of faint luminescence, ghostly white.

Almost on the horizon, you could see the faint luminescence of it upon the smooth sea.

The walls of the tunnel carried a faint green luminescence.

The faint luminescence that started up gave him a creepy feeling, but at least he could see.

One of the Horsemen was passing directly below, a faint luminescence against the dark.

Far above there was the faint luminescence of the shaft opening.