Question

what was the sensitive, well - insulated tool willard f. libby used to date artifacts with known ages?
x - ray machine
richter scale
geiger - müller tubes
petri dish

Explanation:

Willard F. Libby used Geiger - Müller tubes in his radiocarbon dating work. X - ray machines are for imaging, the Richter scale measures earthquake magnitude, and petri dishes are used in microbiology for culturing.

Answer:

C. Geiger-Müller tubes