Strontium — 90
Result:
,
Yr
Error Term:
+
E+ De
Ry
+ Roe U ® 2.22
=
pCi/unit
(4-1}
vO+T-B
(4-2)
C-T:-8
where,
Cc
=
gross counts
D
=
decay of 904
T
=
count time, minutes
Ry
=
85 Sr recovery
B
=
background, cpm
Ro
=
yttrium gravimetric recovery
E
=
efficiency, cpam/dpm
U
=
units (volume or weight)
Y
=
ingrowth 90y
2.22 =
conversion factor, dpm/pCi
Gross Alpha and Beta
Result:
F (=CT - e|
(4-3)
U
Error Term:
+ 2
vOrTB
C-—T*B
.
The counting factor:
1
ae
E « 2,22
(4-4)
Liguid Scintiliation for Alpha and Beta
(= -5)
— -—B
T
—_—_—-—
E*U * 2.22
;
Result:
Error Term:
pCi/unit
C
—+8
T
+ 9
(4-5)
(4-6)
Alpha Spectrometry
N
V
Result:
—
No
Error Term:
+ 2 (A, or Ad)
]IP)
=
Ay.
TVA)1 = A 2
(4-7}
_!
(4-8)
—
Vo
—
4
No
127