2.
Beta d/m 120 days after burst
Ayonp
A, (120 _) -1.2
=
-1.2
(t. - 4)
rot
fio
120
i?
5.10 x 10° d/m
3
TotalJ
disintegrations - 120 days to infinity
7200 Ayo9 (120)*9
8.65 x 10? doo
L.yl
i.
x
10°
a/ft*
Beta disintegrations - Sample date to 120 days.
This may
be formulated
Ny - Np
72004, (t, - ty) 1.2
=
1
-
(to - ty)
0.2
1
(120)
0.2
or from ] and 3
Ny - No
=
(8.68
”
4.1)
x 108
-
4.27 x 108 a/rt?
9
ay we
s
Sn -
ee
sSAY ,
=
~
-
:
7 SSS AALS:
oR
~
os
x
:
SAS
“SS
s
“
.
:
=o
Spe OR RA;
~~
Te
sO
seONTEe .