Exponential Decay of Nuclei based on a public domain image by Kieran Maher (see <a href="https://en.wikibooks.org/wiki/en:Image:NM4_11a.gif" class="extiw" title="b:en:Image:NM4 11a.gif">original image</a>)
<a href="//commons.wikimedia.org/wiki/User:%D0%94.%D0%98%D0%BB%D1%8C%D0%B8%D0%BD" title="User:Д.Ильин">Д.Ильин</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span> based on <a href="//commons.wikimedia.org/wiki/File:Exponential_Decay_of_Nuclei-de.svg" title="File:Exponential Decay of Nuclei-de.svg">File:Exponential Decay of Nuclei-de.svg</a> by <a href="//commons.wikimedia.org/wiki/User:Dirk_H%C3%BCnniger" title="User:Dirk Hünniger">Dirk Hünniger</a>