RHYS LEWIS & MINH TAN PHAM, AHS, DECD, UNISA / SCIENCE PHOTO LIBRARY RHYS LEWIS & MINH TAN PHAM, AHS, DECD, UNISA / SCIENCE PHOTO LIBRARY
Geiger counter detecting beta particles emitted by a disc of strontium 90 (green), a radioactive isotope of the element. Beta particles are electrons emitted by unstable nuclei. They are able to travel tens of centimetres through the air and penetrate thin materials, such as skin.
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