- 3% -
TABLE V
Rocky Flats Exposure*
°F
Number of
Cases
Total Lung
Burden (uCi)
1
0.272
0.033
137,000
1
0.160
0.019
79,000
1
0.111
0.013
54,000
3
0.064
0.008
33,000
0.024
0.003.
lg
/
Hot Particles
Lund Burden (uCi)
-
Number of
Hot Particles
:
12,500
* Mann and Kirchner presented the lung burdens as number
of MPLB.
These have been converted to uCi in colum two
using MPLB=0.016 uCi.
(For the groups with 32 and 19 cases,
we selected the midpoint of the reported rance.)
The hot
particle burden in colum three was estimated by multiplying
the total burden by 0.17, the fraction of the activity on
particles above 0.6 u,
and 0.70,
the
fraction of initial
deposited activity that was involved in low, term retention in
the lung.
Baséd on particle size data reported by Mann and
Kirchner, we estimate the average hot particle activity is
about 0.24 pCi.
The numbers of hot particles in the last column
were obtained by dividing the hot particle burdens in colum
three by the average hot particle activity (0.24 pCi).
Allowing a risk of cancer equal to 1/2000 per hot
particle,
suggests that the individuals whose exposures are
presented in Table V stand a very high chance of developing
lung cancer -- the probability is essentially unity.
In
this respect, it.is significant to note that in the experiments