Every second of the day you are subjected to radiation from compounds in soil, buildings and even your own body.
But for people who fly frequently, cosmic radiation can increase this exposure significantly.
Now there is an app that records your personal radiation to reveal how much you are exposed to from medical examinations, changes in your location, and flights.
The TrackYourDose app was developed by Germany-based esooka.
It uses a mathematical model developed by scientists and meteorologists from the Physikalisch-Technische Bundesanstalt (PTB) in Germany and the University Oulu, Finland.
Radiation from Air Travel