Electrical shielding against ionizing radiation?

Hi Axel,

Just as an aside, in Britian a billion is - to all intents - now
regularly accepted as 1*10^9, following the American practice. The old
British billion (1*10^12 - a US trillion) has ceased to exist in
scientific and popular writings, while the milliard (1*10^9) has gone
the way of the dodo over here.

Andy G