The following are notes taken from Places of Power: Measuring the energy of ancient sites, Paul Deveraux, Blandford.

P59 ON Radiation: ‘Radioactive decay involves alpha and beta particles and gammar rays. Natural radiation has always existed throughout the universe; it is part of the network that sustains it. It is one of the breaths of god. Natural radiation is not different from artificially produced radiation except in its source and concentrations in which it occurs. Natural radioactivity pervades the entire environment and is  usually the major source of radiation people are exposed to … radioactive, and areas where granite oucrops extensively, or where large amounts of the stone are used as a building material in urban areas (Aberdeen, Scotland, for example) will have higher background  radiation counts than areas with less granite.’