Geiger counter detecting alpha particles emitted by a disc of polonium 210 (red), a radioactive isotope of the element. Alpha particles are helium nuclei (two protons and two neutrons) emitted by unstable atomic nuclei. They are only able to travel a few centimetres through the air and are unable to penetrate even thin materials. | |
Licence : | Droits gérés |
Crédit : | Science Photo Library / RHYS LEWIS & MINH TAN PHAM, AHS, DECD, UNISA |
Model Release : | Non requis |
Durée : | 22 Secondes |
Aspect ratio : | 16/9 |
Restrictions : | - |