Answer the following question given this paragraph: 

Measurement of exposure to radioactivity is important for anyone who deals with radioactive materials on a regular basis. Perhaps the simplest device is a personal dosimeter, which is a film badge that will fog up when exposed to radiation. The amount of fogging is proportional to the amount of radiation present.


Q: What is measured with a personal dosimeter?

 Choices:

- alcohol concentration

- blood insulin

- internal temperature

- exposure to radioactivity

A:
exposure to radioactivity
