[foofoo55]

The fluorescence is so weak that the ambient conditions need to be dark and the concrete needs to be hit with only a narrow band of the light spectrum. Then you need a tuned detector to pick up the weak fluorescence, after which the SNR is still so low that the raw data must be processed to produce a meaningful result.

All very doable, but I don't think this would work using a standard CCTV looking at an area bigger than a metre (few feet) across.

A long time ago in a place far far away, I was part of a team that did exactly this to differentiate between healthy and possibly pre-cancerous tissue.

[echelon]

> A long time ago in a place far far away, I was part of a team that did exactly this to differentiate between healthy and possibly pre-cancerous tissue.

How did those techniques pan out? Did patients ingest fluorescent dyes that got ingested and metabolized faster by cancerous cells, or do some types of cancer cells naturally fluoresce with a unique spectra you can detect?

Epithelial and endothelial cells only?

[Nikbul]

In paper they actually propose general light, possibly construction ones, and an near IR camera with NBP filter for 1140nm. Seems reasonable to me.