What was the sensitive, well-insulated tool willard f. libby used to date artifacts with known ages?

Willard Frank Libby used to date artifacts with known ages, "Geiger-Muller tubes". At this time, the chemistry professors and students of Berkeley were developing an interest in atomic energy. So, as a senior project Libby set to work building a highly sensitive "Geiger-Müller tube" that could be used by the department to test the radioactivity of various elements. Hope this helps you. Thanks!

-Charlie

only 10/60 isn't equivalent

hope this : )