United States
Environmental Protection
Agency
Environmental Monitoring
Systems Laboratory
P.O. Box 93478
Las Vegas NV 89193-3478
EPA600/R-92/154
August 1992
Research and Development
Strontium in Water
Intercomparison
A Statistical Evaluation of the
May8, 1992 Data
                                  5168GR92NRD-14

-------
            Strontium in Water
          Intercomparison Study
              May 8, 1992
      Environmental Protection Agency
Environmental Monitoring Systems Laboratory
            Las Vegas, Nevada

-------
            UNITED STATES ENVIRONMENTAL PROTECTION AGENCY
                        OFFICE OF RESEARCH AND DEVELOPMENT
               ENVIRONMENTAL MONITORING SYSTEMS LABORATORY-LAS VEGAS
                                  P.O. BOX 93478
                            LAS VEGAS, NEVADA 89193-3478
                                   (702/798-2100)
Dear Participant,

   Enclosed are the results of the Nuclear Radiation Assessment Division (EMSL-LV)
Intercomparison Study for Strontium in Water; May 8, 1992.

   Please take a few minutes to review this report and the analytical data your
laboratory submitted to us.  If there are any apparent  discrepancies, please notify
us immediately.

   We encourage you to make use of the computer-automated data-entry system that
has been in place for some  time now.  As the number of participants increases, and
it becomes unrealistic for us to receive results by mail or FAX, the computer system
will be our only avenue for accepting data.

   If you have any questions or comments,  please send a message via the data-entry
system or contact Frank Novielli at 702/798-2159 or Patricia Honsa at 702/798-2141.
                                          Sincerely,
                                          Frank Novielli
                                          Senior Chemist
                                          Radioanalysis Branch
Enclosure

-------
                . NOTICE

This material has been funded wholly by
the U.S. Environmental Protection Agency.
It has been subject to the Agency's review,
and it has been approved for publication
as an EPA document.

-------
          EMSL-LV Intercompariaon Study: Strontium in Water,  8-May-1992       1/11


 -  The following pages consist of separate sections for each of the nuclides in this study with four
parts per section.  After the first, each part is separated from the next by a new page or a thick
horizontal bar.  The first page of each section is a statistical summary for the nuclide and starts
with a statement of the known value, the control limits, and the warning limits.
   The warning limits are placed at two normalized standard deviations above and below the
known value and the control limits are three normalized standard deviations above and below
the known value.  If you keep control charts, these values will be useful for anticipating problems
with the accuracy of your analytical methods.

   The coin shaped pie chart at the top of the summary page shows the fate of all the samples
sent out in number and percentage terms.  The pie chart starts at the top and rotates clockwise.
The first sector represents those participants who submitted analytical results within both the
warning and control limits. The next sector represents those who are in the warning region but
not out of control. The third sector represents those who are out of control, but have passed the
the outlier test. The fourth sector represents those who have failed the outlier test. The last
sector represents those participants who have failed to respond properly. This is the case if no
analytical results were returned, or less than three determinations were  reported, or if the results
were received too late.  The reeding on the edge of the coin is spaced at one percent intervals, and
the sector shading becomes darker as the data reliability decreases. Sectors with zero width are
not shown.
   The table in the center shows a number of statistical quantities calculated from the  submitted
data based on the mean and median values in relation to the known value, both before and after
outlier removal. The lower pie chart uses the same construction as the upper chart and shows
the distribution of properly submitted data in terms of deviation from the known value  divided
into sectors representing one, two, three, and greater than three normalized standard deviations.

   The second part is  an alphabetical listing, in lab-code order, of submitted data and several
calculated quantities.  An entry that is shaded has been rejected because of one of the reasons
listed above or failure  of the outlier test. The fifth and sixth columns are a measure of laboratory
precision. The Range  analysis is a normalized value that you may use to keep precision control
charts. If this value is between  2.0 and 3.0, your analytical process precision is in the warning
zone; if it exceeds 3.0 it is out of control. The eighth and ninth columns are the differences from
the mean  of all non-outliers and from the known value, respectively. A tag symbol may appear in
the last column. Each page with tags has a symbol definition summary at the bottom.  If there is
no tag symbol, the data is within the control limits, but it may be in the Warning zone.
   The third part is a three-column listing of result average, tag symbol, and lab-code in average
order excluding those labs not responding properly. In this order, all outliers and out-of-control
results appear at the top or bottom of the list.

   The last part is two bar chart displays showing frequency distributions of responding
participants. The first chart places the known value at the center and a bar at each 0.2 unit of
expected precision. The second  chart places the mean of the reported measurements at the center
and a bar at each 0.2 unit of standard deviation. In both cases, a bar includes those results within
0.1 unit up to the maximum of six. Any results more than six units from the center value are
shown cumulatively by a shaded bar one past the sixth unit. If the central tendency of the known
value distribution falls away from the center, an error in accuracy is indicated. If the distribution
is broad, poor precision is indicated. The mean value distribution is similar but uses the average
and standard deviation of reported results  as its basis.

-------
            EMSL-LV Intel-comparison Study: Strontium in Water, 8-May-1992
                                   2/11
Strontium-89                        Statistical Summary                      114 Participants
The known value of this nuclide is 29.0 pCi/1 with an expected precision of 5.0; the control limits
are 20.3 to 37.7; the warning regions are 20.3 to 23.2 and 34.8 to 37.7
29(25.4 %) Failed to respond «%
6(5.3 %) Outliers '
8(7.0 %) Out of control •'
     but not an outlier


         Statistic
                 63(55.3 %) Within all limits
Respondents
—— 8(7.O %) In warning zone
           but within control


              Non-outliers
Mean
Std. Dev.
Variance
% Coef. of Var.
% deviation of mean from known value
Norm. dev. of mean from known value
Median
% deviation of median from known value
Norm. dev. of median from known value
     27.55
     11.87
    140.97
     43.10
     -5.02
     -0.12
     28.33
     -2.30
     -0.06
    Grand Avg 28.05
                 5.49
                30.11
                19.56
                -3.27
                -0.17
                28.33
                -2.30
                -0.12
15(17.6 %) More than 3 norm. S.D. -,
7(8.2 %) Between 2 and 3 norm. S.D.'
            ;45(52.9 %) Within 1 norm. S.D.
                           of known value
    • 18(21.2 %) Between 1 and 2 norm. S.D.

-------
3/11 EMSL-LV Intercomparison Study:
Strontium-89
Lab
A
AB
AE
AF
AI
AJ
AK
AL
AU
AW
Air
AZ
BA
BB
BC
BG
BH
BL
BM
BO
C
CA
CE
CJ
CK
CO
CQ
OS
CX
D
DD
DE
DG
DO
DT
E
EB
EH
EL
FE
FU
HK
HI?
I
• =
0 s
Res. 1
30.0
•* / j f
26.0
27.0
33.0
33.0
30.0
29.0
34.0
14.0

JGM*
34.0

25.0
' .•
37.0
27.0
27.0
27.0
28.0
24.0

25.0
26.0
23.0
27.0
&&•
32.0
23.0
28.0
24.0
30.0
28.0
28.0
28.0
34.0
29.0
26.0
31.0
24.0
27.0

35.0
Res. 2
28.0
''
28.0
28.0
33.0
29.0
30.0
29.0
33.0
16.0
'__'•-
&#
32.0
'
28.0
f
36.0
27.0
27.0
25.0
28.0
26.0
* * f
25.0
28.0
33.0
29.0
• '" 3U0=
38.0
29.0
26.0
24.0
30.0
29.0
28.0
26.0
33.0
31.0
26.0
31.0
25.0
27.0

34.0
Res. 3
28.0

30.0
30.0
33.0
27.0
35.0
28.0
33.0
20.0

- „ ' &&-'
29.0
v " f
26.0
'
37.0
28.0
28.0
29.0
29.0
22.0
~
22.0
29.0
14.0
28.0
''' " 't&.
34.0
27.0
26.0
24.0
29.0
30.0
26.0
27.0
33.0
33.0
25.0
30.0
25.0
26.0
•* '
34.0
No data submitted
Insufficient
data
X a
Exper.
Sigma
1.16
f
2.00
1.53
0.00
3.06
2.89
0.58
0.58
3.06
'
$M
2.52

1.53

0.58
0.58
0.58
2.00
0.58
2.00

1.73
1.53
9.50
1.00
0,00
3.06
3.06
1.15
0.00
0.58
1.00
1.15
1.00
0.58
2.00
0.58
0.58
0.58
0.58

0.58
Strontium in Water, 8-May-1992

Rng anal Normalized deviation
(R + SR) Average (grand-avg) (known) Tag
0.236
'
0.473
0.354
0.000
0.709
0.591
0.118
0.118
0.709

0.000
0.591
'
0.354

0.118
0.118
0.118
0.473
0.118
0.473
J
0.354
0.354
3.371
0.236
0.000
0.709
0.709
0.236
0.000
0.118
0.236
0.236
0.236
0.118
0.473
0.118
0.118
0.118
0.118

0.118
28.67
'
28.00
28.33
33.00
29.67
31.67
28.67
33.33
16.67
f
&00
31.67
- '
26.33
'
36.67
27.33
27.33
27.00
28.33
24.00

24.00
27.67
23.33
28.00
1.00
34.67
26.33
26.67
24.00
29.67
29.00
27.33
27.00
33.33
31.00
25.67
30.67
24.67
26.67

34.33
TAG SYMBOLS
Determined
to be an
outlier
0.21
. - ' * {
-0.02
0.10
1.71
0.56
1.25
0.21
1.83
-3.94
>
-8,68
1.25
"
-0.59
'f
2.98
-0.25
-0.25
-0.36
0.10
-1.40

-1.40
-0.13
-1.63
-0.02
' -0,37
2.29
-0.59
-0.48
-1.40
0.56
0.33
-0.25
-0.36
1.83
1.02
-0.83
0.91
-1.17
-0.48

2.18
IT = Above
11 s Below
-0.12
'"""-. *>
-0.35
-0.23
1.39
0.23
0.92
-0.12
1.50
-4.27 4
*
*M X j
0.92
*
-0.92
*
2.66
-0.58
-0.58
-0.69
-0.23
-1.73
»
-1.73
-0.46
-1.96
-0.35
^.70 X ;
1.96
-0.92
-0.81
-1.73
0.23
0.00
-0.58
-0.69
1.50
0.69
-1.15
0.58
-1.50
-0.81
»
1.85
control limit
control limit

-------
EMSL-LV Intercomparison Study;
Strontium-89
Lab
'J&i's
1C
J
JE
JS
JY
K
'___,,
KL
KX
L
LM
LS
LT
ME
MN
MQ
MS
N
NT
NJ
KflP-
OA
OL
PB
JPCT;
••pip'
PV
JU,

QK
QL
QM
QU
QW
QX
QZ
R
RE
RM
RN
RR
Btf
Res. 1
;.-,, „,, ^ , '";,/
30.0
29.0
29.0
27.0
31.0
20.0
, ' " ' *,
38.0
30.0
32.0
,,,^;;,..;^.;,;,

14.0
* SJ ** •* S
30.0
/, '
36.0
30.0
29.0
25.0
16.0
', $&'
31.0
24.0
32.0
-' '' / ,",, -
/ '' ,
37.0
21.0
', '" '","'' '''f.
30.0
44.0
21.0
' ', ' '
s>''
10.0
27.0
27.0
Af ' ' ''''-'
29.0
19.0
28.0
'''-'-, '&%&'>'
Res. 2
'/, ''~- -
31.0
28.0
34.0
27.0
29.0
21.0

32.0
32.0
32.0
'/,// xx'
, ' '
14.0
33.0
/ ' '
34.0
30.0
27.0
29.0
14.0
&0'' -
31.0
30.0
32.0
ff _, ^ fff f f fff f f f f
< f /&*+ /'/'/;
36.0
22.0
'r/'»'>7lk
29.0
43.0
24.0
?/' ' ' f * f
' ," ' ,''
10.0
25.0
28.0
,'
32.0
21.0
27.0
''jftisW
t ', ^ISi"^ , r
Res. 3
•* f
29.0
28.0
36.0
27.0
28.0
25.0
'$ '''
30.0
30.0
33.0
''.-;-' '-
-
14.0
30.0
'f /
39.0
29.0
31.0
26.0
9.0
"^47.0
30.0
28.0
32.0
"'"''",', /'
'* ''/' '" * ;,
39.0
23.0
' &•$&/'; v-
28.0
47.0
21.0
-" / '
,-,,
15.0
26.0
26.0
* '
33.0
22.0
27.0
' • t/iflft "'
JvcSvU
• 3 No data submitted
0 9
Insufficient
data
X =
Exper.
Strontium in Water,
Rnganal
8-May-1992
4/11
Normalized deviation
Sigma (R + SR) Average
; - ,_,',
1.00
0.58
3.61
0.00
1.53
2.65
. '
4.16
1.15
0.58
,-
_, f
0.00
1.73
•*
2.52
0.58
2.00
2.08
3.61
'- 0,S8
0.58
3.06
0.00
f f
% ' -
1.53
1.00
' ' -
1.00
2.08
1.73
*

2.89
1.00
1.00

2.08
1.53
0.58
SSI
-// -' V^''/"
0.236
0.118
0.827
0.000
0.354
0.591
' '. ' ' ' ' '' "
0.945
0.236
0.118
•> Jf S ,
'
0.000
0.354
'
0.591
0.118
0.473
0.473
0.827
0.118' ' / >,
0.118
0.709
0.000
'

0.354
0.236
" , / ', *
0.236
0.473
0.354
,

0.591
0.236
0.236

0.473
0.354
0.118
•f\ AjM^y f j i
f ' ff
30.00
28.33
33.00
27.00
29.33
22.00
*
33.33
30.67
32.33
fff f' f ' f
f •*
14.00
31.00
-
36.33
29.67
29.00
26.67
13.00
?.6T''
30.67
27.33
32.00
x ^
••
37.33
22.00

29.00
44.67
22.00


11.67
26.00
27.00
'
31.33
20.67
27.33
100.30
TAG SYMBOLS
Determined
to be an outlier

(grand-avg) (known) Tag
' 4 1 '{f *;„'"' : ; ,
0.68
0.10
1.71
-0.36
0.44
-2.10
. '/.ff •*
1.83
0.91
1.48
' ' :
'
-4.87
1,02
'
2.87
0.56
0.33
-0.48
-5.21
«7,06 „ -
0.91
-0.25
1.37
',
' ' ' ' s '>
3.22
-2.10
',,',"/'
0.33
5.76
-2.10


-5.68
-0.71
-0.36
-
1.14
-2.56
-0.25
' , '2,7,si!! , '
1t s Above
^ s Below
" ' ', ', ' ,,* •*
0.35
-0.23
1.39
-0.69
0.12
-2.42
' •"
1.50
0.58
1.15
#'
*
-5.20 Jl
0.69
*
2.54
0.23
0.00
-0.81
-5.54 U
•7.30 X
0.58
-0.58
1.04
; f
'', y
2.89
-2.42
*
0.00
5.43 TT
-2.42
*
*
-6.00 '1
-1.04
-0.69
•
0.81
-2.89
-0.58
27.48 X.
control limit
control limit

-------
5/11
EMSL-LV Intercomparison Study:
Strontium in Water, 8-May-1992

Strontium-89
Lab
S
SC
SD
SF
SI
SK
9M
SS
ST '
SY
sz
T
TA '
TB
TE
TGI
1H
11
TJ£
TL
u
W
Y
Z
Res. 1
27.0
25.0
19.0
20.0
35.0

^
30.0

29.0
40
27.0



•'

31.0

28.0
1$.
17.0
41.0
30.0
Res. 2
30.0
26.0
20.0
26.0
33.0


28.0

30.0
&G-
29.0
f

••
•'
,
28.0
..
35.0
t&
19.0
38.0
31.0
Exper.
Res. 3 Sigma
31.0 2.08
25.0 0.58
18.0 1.00
13.0 6.51
26.0 4.73
/
'
31.0 1.53
f
29.0 0.58
' 40 .0J&
29.0 1.15
f
' f
f ** >
,
,
30.0 1.53
, ,
37.0 4.73
- <• 1*0 0*00
18.0 1.00
34.0 3.51
29.0 1.00
Rng anal
(R + SR)
0.473
0.118
0.236
2.020
1.120


0.354

0.118
0.13.8
0.236


-


0.354

1.120
0,000
0.236
0.827
0.236
Average
29.33
25.33
19.00
19.67
31.33


29.67

29.33
433
28.33
f



f
29.67

33.33
L00
18.00
37.67
30.00
Normalized deviation
(grand-avg) (known)














'
'








0.44
-0.94
-3.14
-2.90
1.14

*
0.56

0.44
*&2fc
0.10
,
,

•'
'
0.56

1.83
-&87
-3.48
3.33
0.68
0.12
-1.27
-3.46
-3.23
0.81

'
0.23

0.12
-8J4
-0.23



•'

0.23

1.50
-0.70
-3.81
3.00
0.35
Tag


U
11

•
» \

* \

X i

* :
*
* \
« !
* \

*

X \
T


Data sorted by Laboratory Average
Average
1.00
1.00
3.00
4.33
7.67
11.67
13.00
14.00
16.67
18.00
19.00
19.67
20.67
22.00
22.00
22.00
23.33
24.00



















Tag
X
X
X
X
X
u
u
u
u
u.
u
Ji






• ^ No data submitted
0 = Insufficient data
Lab
U
cs
AZ
SZ
NT
QX
NJ
LT
AW
W
SD
SF
RN
QM
Q
K
CO
DE
Average
24.00
24.00
24.67
25.33
25.67 '
26.00
26.33
26.33
26.67
26.67
26.67
27.00
27.00
27.00
27.00
27.33
27.33
27.33
Tag


















Lab
CJ
CA
FU
SC
EL
QZ
D
BC
NI
HK
DD
R
JS
E
BO
RR
OL
DT
Average


















27.33
27.33
27.67
28.00
28.00
28.33
28.33
28.33
28.33
28.67
28.67
29.00
29.00
29.00
29.33
29.33
29.33
29.67
TAG SYMBOLS
x = Determined to be an outlier
Tag


















ft = Above
•11 s Below


















control
control
Lab
BM
BL
CK
CQ
AE
T
J
C
AF
AL
A
QK
N
DO
SY
S
JY
TI
limit
limit .

-------
EM8L-LV Intercomparison Study: Strontium in Water, 8-May-1992
Strontium-89

6/11

Data sorted by Laboratory Average
Average Tag Lab Average Tag Lab
29.67 SS 31.00 EH
29.67 MS 31.33 SI
29.67 DG 31.33 RM
29.67 AJ 31.67 BA
30.00 Z 31.67 AK
30.00 1C 32.00 PB
30.67 OA 32.33 L
30.67 KX 33.00 JE
30.67 FE 33.00 AI
31.00 ME 33.33 TL

Average Tag
33.33
33.33
33.33
34.33
34.67
36.33
36.67
37.33
37.67
44.67 ft
108.33 x
Lab
KL
EB
AU
I
CX
MQ
BH
PV
Y
QL
RU
% Frequency distribution of responding labs(expected prec. vs known value)

I M. I
L - _____• _•_ •••••••••lii.if..
"6 "4 ovn nfoo ~2 0 +2
* " I* Ir-rt/vnm
value
% Frequency distribution of responding labs(std. dev.
. g, ••• •• • •
Q 1 	 -..--• -I--..III.II ll. 1
-6 "* std. dev. -2 0 +2
mean
value
• s No data submitted TAG SYMBOLS
0 ^ Insufficient data x = Determined to be an outlier
•
exp. prec. **

vs mean value)

• _T—
std. dev. +*
ft = Above
41 = Below
• MS
+6



• *»
• I •
control limit
control limit

-------
            EMSL-LV Intel-comparison Study: Strontium in Water, 8-May-1992
                                   7/11
Strontium-90                        Statistical Summary                      114 Participants
The known value of this nuclide is 8.0 pCi/1 with an expected precision of 5.0; the control limits
are 0.0 to 16.7; the warning regions are 0.0 to 2.2 and 13.8 to 16.7
22(19.3 %) Failed to respond %
6(5.3 %) Outliers •
         Statistic
                ; 82(71.9 %) Within all limits
Respondents
4(3.5 %) In warning zone
       but within control


          Non-outliers
Mean
Std. Dev.
Variance
%Coef. ofVar.
% deviation of mean from known value
Norm. dev. of mean from known value
Median
% deviation of median from known value
Norm. dev. of median from known value
     13.00
     37.50
   1406.19
    288.54
     62.45
      0.13
      7.67
     -4.17
     -0.01
 Grand Avg 7.74
             1.96
             3.83
            25.28
            -3.25
            -0.13
             7.67
            -4.17
            -0.17
6(6.5 %) More than 3 norm. S.D. ..
                               '
4(4.3 %) Between 2 and 3 norm. S.D.
            . 78(84.8 %) Within 1 norm. S.D.
                           of known value
      * 4(4.3 %) Between 1 and 2 norm. S.D.

-------
8/11 EMSL-LV Intercomparison Study:
Strontium in Water,
8-May-1992
Strontium-90

Lab
A
AB
AE
AF
AI
AJ
AK
AL
AU
AW
AY
AZ
BA
BB
BC
BG
BH
BL
BM
BO
C
CA
CE
CJ
CK
CO
CQ
OS
ex
D
DD
DE
DG
DO
DT
E
EB
EH
EL
FE
FU
GG
HK
HP
I

Res. 1
8.0
••,
6.0
8.0
6.0
5.0
5.0
10.0
9.0
14.0
7.0
7.0
8.0
8.0
8.0
7.0
8.0
8.0
8.0
6.0
9.0
7.0
8.0
6.0
7.0
8.0
7.0
' -*&*
12.0
8.0
7.0
6.0
7.0
7.0
6.0
8.0
7.0
8.0
8.0
8.0
7.0
,
7.0
. • ;
9.0

Res. 2
8.0

7.0
7.0
7.0
7.0
6.0
9.0
9.0
12.0
7.0
7.0
8.0
8.0
7.0
7.0
9.0
9.0
9.0
7.0
8.0
6.0
7.0
7.0
6.0
6.0
7.0
23.0
8.0
8.0
7.0
6.0
8.0
7.0
6.0
8.0
8.0
8.0
7.0
8.0
9.0
-:' -
7.0
f
9.0

Res. 3
7.0

7.0
8.0
7.0
7.0
5.0
9.0
9.0
11.0
7.0
7.0
8.0
8.0
9.0
8.0
8.0
9.0
7.0
6.0
8.0
7.0
8.0
6.0
7.0
11.0
8.0
- **&
9.0
8.0
7.0
6.0
8.0
7.0
6.0
8.0
8.0
7.0
8.0
9.0
10.0

7.0
'
10.0
• s No data submitted
0 3
Insufficient
data
x s
Exper.
Sigma
0.58
$
0.58
0.58
0.58
1.15
0.58
0.58
0.00
1.53
0.00
0.00
0.00
0.00
1.00
0.58
0.58
0.58
1.00
0.58
0.58
0.58
0.58
0.58
0.58
2.52
0.58
, ' &8&
2.08
0.00
0.00
0.00
0.58
0.00
0.00
0.00
0.58
0.58
0.58
0.58
1.53

0.00

0.58
Rnganal
(R + SR)
0.118
- -
0.118
0.118
0.118
0.236
0.118
0.118
0.000
0.354
0.000
0.000
0.000
0.000
0.236
0.118
0.118
0.118
0.236
0.118
0.118
0.118
0.118
0.118
0.118
0.591
0.118
O.I1&
0.473
0.000
0.000
0.000
0.118
0.000
0.000
0.000
0.118
0.118
0.118
0.118
0.354

0.000

0.118
Normalized deviation
Average
7.67

6.67
7.67
6.67
6.33
5.33
9.33
9.00
12.33
7.00
7.00
8.00
8.00
8.00
7.33
8.33
8.67
8.00
6.33
8.33
6.67
7.67
6.33
6.67
8.33
7.33
23.33
9.67
8.00
7.00
6.00
7.67
7.00
6.00
8.00
7.67
7.67
7.67
8.33
8.67
'
7.00

9.33
TAG SYMBOLS
Determined
to be an- outlier
(grand-avg)
-0.03
'' r ' "'-•' '"
-0.37
-0.03
-0.37
-0.49
-0.83
0.55
0.44
1.59
-0.26
-0.26
0.09
0.09
0.09
-0.14
0.21
0.32
0.09
-0.49
0.21
-0.37
-0.03
-0.49
-0.37
0.21
-0.14
&40
0.67
0.09
-0.26
-0.60
-0.03
-0.26
-0.60
0.09
-0.03
-0.03
-0.03
0.21
0.32
'
-0.26
'
0.55
(known) Tag
-0.12
*•
-0.46
-0.12
-0.46
-0.58
-0.92
0.46
0.35
1.50
-0.35
-0.35
0.00
0.00
0.00
-0.23
0.12
0.23
0.00
-0.58
0.12
-0.46
-0.12
-0.58
-0.46
0.12
-0.23
&31 K \
0.58
0.00
-0.35
-0.69
-0.12
-0.35
-0.69
0.00
-0.12
-0.12
-0.12
0.12
0.23
«
-0.35
»
0.46
It 3 Above control limit
•II s Below Control limit

-------
EMSL-LV Intercomparison Study:
Strontium in Water,
8-May-1992
9/11
Strontium-90

Lab
IA
1C
J
JE
J<*
JS
JY
K
KH
KL
KX
L
LM
t&,''
LT
M
ME
MN
MQ
MS
N
NI
NJ

isn?'
OA
OL
PB
PC-
PP
PV
Q
QJ
QK
QL
<1M
Qfl
QX
QZ
R
RM
RN
RR
nur.
• =
0 3

Res. 1
* / '' - -'
8.0
8.0
9.0
, > ,'
7.0
6.0
7.0
- ' - , ':-'
9.0
7.0
8.0
,'
» ' ' ' ' '
12.0
">;,
8.0
,' /
6.0
9.0
7.0
8.0
15.0
j- .- .• ^x •*

6.0
6.0
8.0
-'; '' '„"''/ "''
8.0
4.0
11.0
7.0
8.0
10.0
33.0'V
f s 
-------
10/11
EMSL-LV Intel-comparison Study:
Strontium in Water, 8-May-1992

Strontium-90

Lab
S
SC
SD
SF
SI
SK
SM
SS
ST
SY
sz
T
TA
TJD
*&
TH
H
TL
U
W
Y
Z

Res. 1
7.0
7.0
6.0
15.0
9.0


8.0
..
7.0
21.0
8.0
50.0
*"


1.0
6.0
15.0
8.0
6.0
8.0

Res. 2
6.0
6.0
7.0
14.0
8.0
f

8.0
*" f *' *'
8.0
$&&
8.0
•$&&
-
-
'
2.0
5.0
14.0
8.0
5.0
8.0

Res. 3
6.0
6.0
6.0
17.0
10.0
f
'*,',
8.0
	
7.0
5J&0
7.0
5^0
• '
'
' ,x '
1.0
5.0
15.0
8.0
8.0
8.0
Exper.
Sigma
0.58
0.58
0.58
1.53
1.00


0.00
f
0.58
8J1
0.58
4.62

'

0.58
0.58
0.58
0.00
1.53
0.00
Rnganal
(R -f- SR)
0.118
0.118
0.118
0.354
0.236

•"
0.000
.•
0.118
OJ27
0.118
0.945



0.118
0.118
0.118
0.000
0.354
0.000
Normalized deviation
Average
6.33
6.33
6.33
15.33
9.00
,
•* f
8.00
_,
7.33
24.00
7.67
55.33


•*
1.33
5.33
14.67
8.00
6.33
8.00
(grand-avg) (known)
-0.49
-0.49
-0.49
2.63
0.44
•*
'
0.09
X
-0.14
5.63
-0.03
16.49
' "
'
/
-2.22
-0.83
2.40
0.09
-0.49
0.09
-0.58
-0.58
-0.58
2.54
0.35
'
f
0.00

-0.23
5.54
-0.12
18-40



-2.31
-0.92
2.31
0.00
-0.58
0.00
Tag





*
" »

' *„

x i

X
*
9-
*






Data sorted by Laboratory Average
Average
1.33
4.67
5.33
5.33
5.67
6.00
6.00
6.00
6.33
6.33
6.33
6.33
6.33
6.33
6.33
6.33
6.67
6.67
• s No




.














Tag


















Lab
TI
PV
TL
AK
OA
MQ
DT
DE
Y
SD
SC
S
QZ
CJ
BO
AJ
RN
QX
Average


















data submitted
0 = Insufficient data
X s
6.67
6.67
6.67
6.67
6.67
6.67
6.67
7.00
7.00
7.00
7.00
7.00
7.00
7.00
7.00
7.00
7.33
7.33
Tag


















Lab
NI
KX
K
CK
CA
AI
AE
RR
RM
QJ
OL
HK
DO
DD
AZ
AY
SY
N
Average Tag


















TAG SYMBOLS
Determined to be an outlier
7.33
7.33
7.33
7.33
7.33
7.67
7.67
7.67
7.67
7.67
7.67
7.67
7.67
7.67
7.67
7.67
8.00
8.00
ft = Above
ll> = Below


















control
control
Lab
ME
JY
JS
CQ
BG
T
R
KL
JE
EL
EH
EB
DG
CE
AF
A
Z
W
limit
limit
-------
EMSL-LV Intel-comparison Study: Strontium in Water, 8-May-1902 11/11
Strontium-90
Data sorted by Laboratory Average
Average Tag Lab Average Tag Lab Average Tag Lab
8.00 SS 8.33
8.00 QK 8.33
8.00 PB 8.33
8.00 J 8.33
8.00 E 8.67
8.00 D 8.67
8.00 BM 8.67
8.00 BC 9.00
8.00 BB 9.00
8.00 BA 9.00
8.33 PP 9.00
8.33 1C 9.33
9.33
FE
GO
C
BH
L
FU
BL
SI
QL
MS
AU
I
AL
9.67 CX
11.33 Q
12.00 LT
12.33 AW
14.00 NJ
14.67 U
15.33 SF
23.33 x CS
24.00 x SZ
30.67 x NT
33.67 x QM
55.33 x TA
363.00 x RU
% Frequency distribution of responding labs( expected prec. vs known value)
Oft« _-___..—___._.___._._._.
20 	 .... 	 ... H
in. llll
m
-T-H"


1

	
'6 '4 exp.prec. -2 ^6^ +2
value
% Frequency distribution of responding labs(std. dev.


h
10. ... ... .... .... II
10 .. 	 	 	 ...H
T»lt




— I
exp. prec. +* +*
vs mean value)





• ...

	 __ 1
-'* ' -'4 std/dev. -2 ' mean ' +2 std.dev. *• +*
value
• s No data submitted TAG SYMBOLS
0 = Insufficient data x & Determined.to be an outlier
ft s Above control limit
JJ- = Below control limit
-------