Let a(t) = Activity yl, d/m per 10,000 fissions.
a
ce
Na”
fF
q
a
= Total activity of fission preducts, d/m per 10,000 fissions.
S
~~
ct
Nw
A(t)
Total activity of fission products in the area, po/ft-
Activity P31 an the area, uofft”
2
s Arca, in ft /day, grazed by sheep
p@ Fraction pl caten which goes to thyroid.
If th. fission products in thc area are not disproportionated,
u(t)
uy(t)
a
A(t)
Akt)
andi thus the amount of I" per day going to the thyroid of the sheep is
Q(t) = pquzlt).
2s
weer ee cccvce
(1)
Then the change in the thyroid activity per day is given by
a
= pau(t)
(t)-w
aay
@ecweecevee
(2)
Where A, = total biclogical and radioactive deaay constant for pu
a = amount of DP (5) in thyroid at
any time t (days)
Also, from H. M Parker, ref (5)
D
=
55Ga
cecccceccccocce
(3)
Where D = dose rate, rep/day, to organs the dot denoting the time derivative
of D.
Let:
m= mass of organ, gn
E = average energy of beta radiation, Mev
(all raddatdon assumed absorbed in the tissue).
NO’ ARCHIVES