Yes, perhaps we could measure some radiation in the picture noise if the cover is closed. But as far as I know only Alpha and Beta radiation. The even more dangerous, the Gamma Radiation is not measurable this way. But the mobile measuring instruments (Geiger-Müller counter) are also not capable against Gamma Radiation.

But we anyway must find a way to access the camera with a closed cover... is the camera only because of the driver and software implementation not working or are some wires not connected as soon as the cover is closed?

The next issue: Who is brave enought to do the testing?

We have to calibrate each camera sensor before and we will be responsible if the application fails and some dude relies on this application.

What if the application wouldn't detect anything while someone is in real danger?

Fun is fun. And this is clearly a harmless application. But as soon as someone cold gets hurt the fun is over and from that point it's not my project anymore...