What is used to measure radioactivity

Question: What is used to measure radioactivity
- Keywords:
  measure,
  radioactivity
Asked by anon-208874 to Gill on 7 Mar 2019.
- Gill Harrison answered on 7 Mar 2019:
  
  A Geiger counter is commonly used.
  
  Staff who work with radiation wear personal monitoring devices, so that we know they are not getting exposed to too much radiation.
  
  https://www.wikihow.com/Measure-Radiation

Question: What is used to measure radioactivity