When most people hear the word radiation, their minds jump straight to nuclear disasters, such as those at Chornobyl or Fukushima.

But radiation is everywhere. In fact, right now, as you read this, you are being exposed from the ground beneath your feet, the air around you, and even your own body. Radiation is not inherently bad: What matters is how much you are exposed to.

To this end, my team and I have built the first radiation map of our hometown, Sydney. This map provides a new perspective of the city, showing that the ground beneath the city is constantly emitting a small amount of natural radiation. Spoiler: It’s nothing to worry about.

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