background radiation is the same level everywhere

Granite rock is radioactive because it ...

Which gas is a major source of background radiation?

Which element is usually radioactive?

Background radiation is ...

Human activities can increase the amount of background radiation

Nuclear bombs increase the amount of background radiation

Which rock gives out a lot of radon gas?

Which place has more background radiation?

Granite rock increases the amount of background radiation

background radiation is everywhere on planet Earth

ionizing radiation is everywhere on planet Earth

Cosmic radiation increases the amount of background radiation

Flying in a plane increases your exposure to cosmic radiation

Living near rock increases your exposure to cosmic radiation

Mountain climbing increases your exposure to cosmic radiation

Digging a hole increases your exposure to cosmic radiation

Eating food increases your exposure to cosmic radiation

Bricks give out cosmic radiation

Bricks give out some ionizing radiation

Bananas give out some ionizing radiation

Planet earth contains radioactive substances

Planet earth gives out ionising radiation

people who use microwaves daily receive more background radiation than astronauts

Who receives the most cosmic radiation?

Who receives the most cosmic radiation?