or
~-
'
k= tt pe/sq em;
KE, BR
however,
photons/sec/sq om = (He/sa_cr)(3.7 x 1¢4}
t
Ty,
\
and
1
t
EB, = et
r
4
4
t
\
where
et
’
EB
= averare germa energy in Mev/photon,
Therefore,
A,
=
Let
(1403.7
x 14)
—t *
(K) (Ey/r_ )(B)(R) (rg)
=
3.7 3s? xi 10h 1a!
KEL BR
'
I,
= 1 r/hr at 0 +9 days
K
= 0.12
(ref 7)
B
= 1.45
(ref 6)
R
= 0.60
(ref 10)
E.
= 0.344 Mev/photon at O+ 8&8 days.
‘
photons/sec/sqy em,
The value of the averape ganma energy was experimentally determired
from a Shot 5 sample at 0+ ® days.4/ The zanma spnectrum experienced
little change over the period 0+ &to 0 + 10 days and its applicability
to Shot 1 calculations has heen indcicated.*
tharefore,
Th
tf
Le
t
A.
*
t
2
4
(3.7 x 104)(1)
(0.12)(0.344){1.45 (0.60)
=
1203 x 106 photons/sec/sq cm at 0 + 9 days
Private communication from C.S.Cook, USNRDL
145
\
.
j
7