composition is
.
*
-=
204 x 1078 from 79 activation anaivsis measurements cver a 10
m
year gerilod.
:
-
o.
;
1A73
The observed standard deviation is 20.46 «
oo,
_
deviation of the mean
is 29.905 «x 10
-3
10
and
the standard
~.
Interlaboratory standards containing 29, and
‘I in a basic XI solution
at three difiterent isotopic ratios were received at the Battelle Pacific
Northwest Laboratory (PNL) from Dr. O.K. Manuel of the University of Missouri
(12).
These standards were analyzed at 2NL 3y the activation analysis method
described in this paper and in Dr. Manuel's laboratory by an activation analvsis
method that uses mass spectrometric Xe isotope ratio determinations (13).
Surements
+
Gocd
at
.
doth
.
,
Laboratories were
agreement between the
based on
.
:
Laboratories was
the
NBS
129
I
.
standard
.
observed over a
Mea-
,
(SRM=-4949),
129
4
.
“““I concentration
range of 10 , as shown in Table fl.
TABLE LI
Interlaboractory Comparison of Activation Analysis Resuits
127,
129,
(me)
(atoms )
Sample
Lab*
tMR=10-(129,53)No. 1
UMR
10.0 (gravimetric)
PNL
1143
UMR=10-(129,53)No. 2
UMR
1.0 (gravimetric)
UMR-10-(129,53)No. 3
UMR
1.0 (gravimetric)
*UMR:
PNL:
PNL
1.0+0.3
PNL 0.8+0.3
University of Missouri, Rolla
Pacific Northwest Laboratory
?
129,
127,
(atom ratio)
5.2920.29x107°
3.040.7x1019
5,620.4x107>
2.720.lx10l2
§,720.6x1077
5.41077
§.4x1079
,
2.220.7x1019 5,741.8x107?
|
oe:
so
a