70.0 MB (2.4 MB compressed)
5470 x 4471 pixels
46.2 x 37.8 cm ⏐ 18.2 x 14.9 in (300dpi)
MARTIN BOND / SCIENCE PHOTO LIBRARY MARTIN BOND / SCIENCE PHOTO LIBRARY
Smoke detector radiation source. Close-up of the internal componenets of a smoke detector, showing a chamber containing a sample of the radioactive isotope Americium 241. Any smoke entering the chamber is ionised by the radiation and conducts a current, setting off the smoke alarm.
Model release not available. Property release not required.