30.3 MB (1.7 MB compressed)
3986 x 2657 pixels
33.8 x 22.6 cm ⏐ 13.3 x 8.9 in (300dpi)
TREVOR CLIFFORD PHOTOGRAPHY / SCIENCE PHOTO LIBRARY TREVOR CLIFFORD PHOTOGRAPHY / SCIENCE PHOTO LIBRARY
Measuring the half-life of protactinium. Protactinium is a radioactive chemical element. The half-life of a radioactive substance is the amount of time required for the amount of radioactivity to fall to half its initial value.
Model release not required. Property release not required.