Radioactivity measured by which device?

ریڈیو ایکٹیویٹی کی پیمائش کس آلے سے ہوتی ہے؟

Radioactivity meter

Geiger counter

Roll counter

None of these

Antoine Henri Becquerel was an engineer, physicist, Nobel laureate,

First person to discover evidence of radioactivity.

He belonged to France.