TABLE 4-4. RADIOACTIVE STANDARD SOURCES
Source
lsotope(s)
Serial
Number
Reference
Date
Base
Decay
Material
(dpm)
Calibration
_Purpose_
Elec troplated Dises (SS = stainless steel; Ni = nickel)
0c
905,90y
S-1447
s-7668
5-5-77
5-9-77
Ss
Ni
0.0049 + 0.0002!
16,420 + 490
Gamma spectrometer
Beta counter
90,90
5~-1510
6-10-77
Ni
3,060
Beta counter
90580y
905,90y
230»
235)
+ 96
s-1914
s-1915
S-10764
S-1508
11-9-78
11-9-78
6-10-77
6-10-77
Ni
Ni
ss
SS
1,320
1,700
1,630
1,250
+
+
+
+
40
90
30
25
Beta counter
Beta counter
Alpha counter
Alpha spectrometer
2365),
S-1513
6-10-77
$s
8 20
+ 20
Alpha spectrometer
Mixed
8-151]
6-10-77
8S
3,760
+ 80
Gamma spectrometer
239 bu
S-1509
6-10-77
Ni
4,040
+ 80
Alpha spectrometer
S-7669
5-9-79
Ni
4,150
+ 80
24) ay
241 am
S-7680
6-10-77
Ni
1,260 + 25
Alpha spectrometer
Alpha spectrometer
Solutions
0G
7-1-76
2,904/ml
Gammasystems
I33R0
7-1-76
13,928/ml
Gamma systems
ISTE.
5-1-76
13,159/ml
Gamma systems
Internal tracer®
1S2py
4-16-77
444,000/ml
236 p,,
7-2-78
5.17/ml
239p,
Mixed?
1281
4332
Gamma systems
10-1-76
Sept. 74
99.42 + 1%
134.5 + 1.4%
Prepare spikes
Internal tracer
6-1-74
2,434/ml
Gamma and spikes
133R4
9-19-78
12,079/ml
Gamma systems
241 ay
9-19-78
2,417/ml1
Gamma systems
241 am
au & os NM he
Petri Dishes (coral base)
Unit is pCi rather than dpm.
Source included 237Np, 38pu, and 239Pu,
Used NBS 239Pu standard 1281 to cross-calibrate 286py,
Alpha emissions pet second per gram of solution. From NBS.
Source included 229Np and 243Am. Aetivity ratio of 241Am to 243am was 0.002.
Nuclear transformations per second per gram. From NBS.
129