> The reading on the gieger counter although at first sounds concerning, depends on what "scale" the unit was set on.
Exactly. Point a geiger counter up to the sky, and it will find some radiation.
Put it in a cave, and it will find some coming from the earth.
Go near a truckload of bananas or potatoes, and you'll find some too.
Have a look here, to give you a sense of scale.
http://xkcd.com/radiation/