- 16 -
*
ee
¢
sd
particle irradiation of deep respiratory tissue-?.
The
last two columns in Table III describe the radiation field
around such a particle in the lung using Geesaman's lung
mode17?,
The dose rate to the entire organ is given in
colum 2 of Table IIz for comparison.
From Table III it is
significant to note that with an assumed DF=1, the lung
dose from the same particle varies by more than 8 orders of
magnitude depending on whether one averages the dose over
os
the entire lung or calculates it on the basis of the tissue
exposed,
TABLE III
Radiation Dose Rate Due to a Pu-239 Particle
(1 u in diameter, 0.28 pci?)
Soft
-~Tissue
24
’ Irradiated
Mass of
Tissue
(0.4 ug _
Dose Rate
(rem/yr)
21/
.
730,000
Lung
Tissue
Entire
Ordan
1000 g
Irradiated
27
0.0003
20 Alveoli
65 ug
19 ug
4000
11,000
Geesaman, Donald P., An Analyse
from an
Closest
Inseciuscle plrohashrivvines fevers
Lerotreeioin
Respiratory Tissue, UCRL-303c7 anc UTRL-503 7
Lawrence Livermore
Laboratory,
Livermore,
C
Lift.,
1965S.