DAFTAR PUSTAKA
https://en.wikipedia.org/wiki/Radioactive_source
https://techno.okezone.com/read/2020/02/18/56/2170108/apa-itu-
radioaktivitas
https://lancangkuning.com/post/18035/pemanfaatan-radioaktifitas-dan-
dampaknya-di-kehidupan-sehari-hari.html
https://youtu.be/IXbAvjg7qVE