I’m not even sure it would show up on film either. But for CCD cameras (aka phone cameras and basically all modern cameras), 350 americium buttons buttons from a smoke detector in a wide “stew” that far away would produce nowhere near enough ionizing radiation to do that. On top of it, americium-241 is an alpha emitter, meaning that even if alpha particles reached the lens, the lens itself would block a good amount an alpha. This video gives a demo of a CCD without protection over it with americium and other various emitters :)

https://m.youtube.com/watch?v=jFNvYA7731o

Christopher Larkin moment

I finished it, and my goodness, the music was perfect ! Any other composer would have made me mute the song as I failed the screen 100 times for hours, but somehow Lena’s music doesn’t get annoying after looping.