4
45
fable
6.
Interlaboratory calibration of 239,2405, standard solution
L.L.L. No. 1100, Hoff et al.(1973) and IAEA standards.
rene
en eae
are
239, 2460p,
Laboratory
(apm/m1l)
L.L.L.
1303 + 28
L.L.L.
1320 + 20
L.L.L.
1265 +
M.C.L.
1255 +15
L.F.E.
L.R.E.
E.1.C.
M.C.L.
Mean Value
Technique
5
Counting Standard
Direct Assay Counter
Efficiency 49.6%
HE 241-Am
Pulse Height Analysis
242Pu Environmental
Standard
Mass Spectrometry
242pu Mass Spec-
trometry Standard
Pulse Height Analysis
7?36pu standard
1330 + 27
1273 + 64
Pulse Height Analysis
Pulse Height Analysis
236Pu
236Pu (H.A.S.L. Cali-
1207 + 54
Pulse Height Analysis
1272 +
6
Mass Spectrometry
242Pu Mass Spec-
trometry Standard
bration Standard)
236pu (LLL.L. Calibration Standard)
(equal weights on all data)
1278
(Mean)
(weighted)
414
1270
Error S.D.
(Single Determination)
Error S.D.
S.D.
(Single Determination)
(Mean)
S.D.
Mean Value
Reference Tracer
£39
412
+4
Standards
Recommended Value
Sample No.
Sample Type
AG-I-1
Seaweed
SD-B-1
Sediment
*
*
238pu
(pCi/a)
3.8
+0.1
0.042
+.004
239,240py
(pCi/q)
27.0%
+0.1
0.96*
+0.03
L.R.E. Value
238py
(pCi/gq)
3.1**
+0.1
N.D.
Average of 18 different laboratory results.
Average of four determinations.
+240py
(pCi/q)
23.4**
+1.0
0.95*
£.07