New Scientist reports:-
Geiger counter in every human revealed
19:00 28 May 03
http://www.newscientist.com/news/news.jsp?id=ns99993768
. . .
Heavy particles
Researchers have long suspected that slow-moving, heavy particles such as
alpha particles and neutrons should leave a characteristic pattern of
damage. . . .
Workers with moderate levels of exposure had a lower level of damage, while
those with no radiation exposure had none. Even workers at a nuclear reactor
exposed to high levels of sparsely ionising gamma rays and mutating
chemicals had very few intrachromosomal changes, though they had significant
interchromosomal damage.
. . .