V. B. 3.
Step 1.
Doses to the Bones*
Compute the total dose to an organ from a daily intake of constant
‘volume or mass but with the activity intake decreasing according to
radiological decay of the isotope.
A.
The dose (ignoring for the time any biological decay) to the organ
from any day's intake is:
tT
T
D, = Ro fe aT dT- Ro fe rlay
0
0
Where: Dy, =dose from any day's intake
Ro =initial daily dose rate
Ap =radiological decay
T =number of days intake
7 =time in days (variable)
Dy = RO (e an e -y1)
dr
B.
The total cose (iznoring biological decay) to the organ is:
Ro T
a,
i
Dp Sle
0
Po
Dp “52 jee
C.
-_
-e-\.T)
-_
Oy
“A?
“ei
a}
- Tevet
The dose to te organ considering biological decay is:
fr
TOES
a
+
Dp =| Berke} Frejbre 4° 2 dyTeAr
nd
co
Dr = Chet
So
1077), 2712,
wv
= Lipe sroce fissita oreduch intulc on 3+
1
f
f
o
anor
,
:
(12)(5.8
=. 1077)
= 6.37
x poe
lot pe ofa S$r99 intalze
on D+ 3
4
tospute initia’ asaty dese rate (Uo);
3
foe
Stay 2.
lee~rT ~ x,.Te7*r?
tL
(6.37 x 1074)/0.25) = 1.5¢ y lo-u yc OF Sr?0 deposited in the bones
(1.59 x 1074) (qe) (2.2 ¥ 107%} (4/dav-ue) (1.5) (Mov) (1.6 * 1079) ergs/nev
LOOlergs/em - radj(7 x 1073}(grans)
1.16 x 10-6 rads/day
“Under the conditions assumed here, that the water is stored and used as the sole
source of supply for 70 years, the strontium-90 content acccunts for almost all
PLR am,
OG.
OF
v7
Taye
Colt aves,
- 45 -
-