Check these links for valuable isotope-related resources — and let us know if you have another one that we should include here!
Periodic Table of the Elements
Stable Isotope Laboratories Around the World
National Isotope Development Center (NIDC)
Handbook of Stable Isotope Analytical Techniques
Ci/Bq, Bq/Ci Conversion Applet
Here are a few educational videos that focus on isotopes and the periodic table:
And you won’t want to miss these — even just for their entertainment value!

