What causes background radiation to vary?

Stuff:

- How radioactive nuclei is produced

- Radiation in different parts of UK



PLEASE write in your sources. 10 points for best answer!What causes background radiation to vary?
Non-uniform distribution (caused by conditions present in the formation of the Earth) of radioactive sources in the crust.What causes background radiation to vary?
The Radiation Protection Division (RPD) of the Health Protection Agency (HPA) is the place to go for information about radiation in the UK. They used to be called the National Radiological Protection Board (NRPB).



Actually, having now gone and visited their site to look for links to give you, it seems that they don't have all the useful NRPB pamphlets available for download and they haven't yet replaced them with new HPA-RPD ones.

There is one on Radon:

http://www.hpa.org.uk/webw/HPAweb%26amp;HPAweb鈥?/a>



And you can download HPA-RPD-001 which was a 2005 review of ionising radiation exposure to the UK population. It runs to about 110 pages.

http://www.hpa.org.uk/webw/HPAweb%26amp;HPAweb鈥?/a>