So yes, in that case, if you wor
k it out and do the dose symmetry, asking how much of the radiation is coming from the uranium and how much of it is coming
from radon and the daughters of radon, you find the dose
from uranium is minuscule compared with the dose
from both normal radon, which comes
from uranium, and another radon isotope that we call thoron, that comes
from thorium, which is present in the uraniu
...[+++]m deposits.