4»EPA
United States
Environmental Protection
Agency
Environmental Monitoring
Systems Laboratory
P.O. Box 93478
Las Vegas NV 89193-3478
EPA/600/R-92/193
September 1992
Research and Development
Radium in Water
Intercomparison Study
A Statistical Evaluation of the
July 17, 1992 Data
5168GR92NRD-1B
-------
Radium in Water
Intercomparison Study
July 17, 1992
Environmental Protection Agency
*
Environmental Monitoring Systems Laboratory
Las Vegas, Nevada
-------
UNITED STATES ENVIRONMENTAL PROTECTION AGENCY
OFRCE 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 Radium in Water; July 17, 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.
-------
EMSLrLVIntercomparison Study: Radium in Water, 17-Jul-1992 1/13
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 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.
-------
EMSLrLV Intel-comparison Study: Radium in Water, 17-Jul-1992
2/13
Radium-226
Statistical Summary
137 Participants
The known value of this nuclide is 24.9 pCi/1 with an expected precision of 3.7; the control limits
are 18.5 to 31.3; the warning regions are 18.5 to 20.6 and 29.2 to 31.3
34(24.8 %) Failed to respond «,
4(2.9 %) Outliers '
8(5.8 %) Out of control *'
but not an outlier
Statistic
. 79(57.7 %) Within all limits
Respondents
12(8.8 %) 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
23.86
4.75
22.60
19.92
-4.17
-0.22
24.50
-1.61
-0.08
Grand Avg 24.17
3.60
12.96
14.89
-2.93
-0.20
24.63
-1.07
-0.07
12(11.7 %) More than 3 norm. S.D.
12(11.7 %) Between 2 and 3 norm. S.D.
.52(50.5 %) Within 1 norm. S.D.
of known value
27(26.2 %) Between 1 and 2 norm. S.D.
-------
3/13 EM8L-LV Inter-comparison Study:
Radium-226
Lab
A
AE
AF
AI
AJ
AK
AL
AP
AW
AZ
BA
BC
BG
BH
BK
BL
BM
BO
C
CA
CE
CG
CJ
CK
CS
DB
DE
DT
DZ
E
ffiH.
HHt
EO
ER
FE
FN
FP
GG
ON
GQ
FTP!
HK
HL
HP
TO
=
0 a
Res. 1
25.5
23.6
23.0
24.7
25.6
17.2
22.9
26.0
16.0
26.6
24.3
19.5
20.9
20.8
25.0
24.2
23.0
24.8
22.0
22.6
24.1
23.3
22.0
114'
23.4
21.6
22.6
25.0
24.5
23.4
' , /
f f ff^
24.7
26.4
24.0
30.4
33.0
'
22.9
27.2
23.3
21.3
28.5
Res. 2 Res. 3
25.6
25.3
22.7
25.4
24.9
16.7
19.5
27.8
12.4
25.5
23.9
22.3
20.4
21.7
24.8
24.8
22.1
24.4
22.1
23.3
25.2
25.5
24.0
' '1U ;
24.7
20.8
22.6
24.0
23.9
25.4
'>, , ' '"
'' ' ' ''' ' <.''' '
23.6
24.5
24.0
27.8
34.0
'
24.0
27.2
23.3
18.5
28.5
24.4
24.2
23.0
24.5
24.5
17.4
26.4
27.8
22.1
23.1
26.1
22.0
17.6
22.4
24.5
23.5
21.9
24.7
24.7
21.1
18.3
23.6
24.0
£&£<
25.8
20.3
22.7
25.7
25.7
24,0
','""""":
" $ffff
25.8
25.2
25.0
27.5
40.0
'
24.3
28.0
25.9
22.1
28.5
No data submitted
Insufficient
data
x =
Radium in Water,
Exper. Rng anal
Sigma (R + SR) Average
0.67
0.86
0.17
0.47
0.56
0.36
3.45
1.04
4.90
1.79
1.17
1.54
1.78
0.80
0.25
0.65
0.59
0.21
1.53
1.12
3.71
1.19
1.15
;, ft&t
1.20
0.66
0.06
0.85
0.92
1.03
T,i ;',''
">/<"<><* / -^ ^
1.10
0.96
0.58
1.59
3.79
_.
0.74
0.46
1.50
1.89
0.00
0.192
0.271
0.048
0.144
0.176
0.112
1.193
0.287
2.045
0.559
0.351
0.447
0.527
0.255
0.080
0.208
0.176
0.064
0.431
0.351
1.193
0.351
0.319
0.239
0.383
0.208
0.016
0.271
0.287
0.319
--
f ,
0.351
0.303
0.160
0.463
1.224
0.223
0.128
0.415
0.575
0.000
25.17
24.37
22.90
24.87
25.00
17.10
22.93
27.20
16.83
25.07
24.77
21.27
19.63
21.63
24.77
24.17
22.33
24.63
22.93
22.33
22.53
24.13
23.33
net
24.63
20.90
22.63
24.90
24.70
24.27
ff'* '
j"~ "'"^ ' ('/
24.70
25.37
24.33
28.57
35.67
-
23.73
27.47
24.17
20.63
28.50
TAG SYMBOLS
Determined to be an
outlier
17-Jul-1992
Normalized deviation
(grand-avg) (known) Tag
0.47
0.09
-0.60
0.33
0.39
-3.31
-0.58
1.42
-3.43
0.42
0.28
-1.36
-2.12
-1.19
0.28
0.00
-0.86
0.22
-0.58
-0.86
-0.77
-0.02
-0.39
- -5.85
0.22
-1.53
-0.72
0.34
0.25
0.04
i, ',,
. ... .. ..., ...^
0.25
0.56
0.08
2.06
5.38
-0.20
1.54
0.00
-1.66
2.03
It s Above
II s Below
0.12
-0.25
-0.94
-0.02
0.05
-3.65
-0.92
1.08
-3.78
0.08
-0.06
-1.70
-2.47
-1.53
-0.06
-0.34
-1.20
-0.12
-0.92
-1.20
-1.11
-0.36
-0.73
«04fr X
-0.12
-1.87
-1.06
0.00
-0.09
-0.30
", , *
",""#%
-0.09
0.22
-0.27
1.72
5.04 fl
*
* :
-0.55
1.20
-0.34
-2.00
1.69
«
control limit
control limit
-------
EMSL-LV Intel-comparison Study: Radium in Water,
17-Jul-1992
4/13
Radium-226
Lab
HY
I
"ik"
m
j
JE
JG
JS
JX
JTf
K
KL
KZ
L
LB
LM
LS
LT
LZ
M
ME
MN
MO
MET'
N
NA
NES
NO
«0*
NT
JOT
OF
OE
OS
ox
OY
P
PB
FE
PG
PP
PV
FW
Res. 1
22.3
24.3
f j f *
% ff
21.3
25.3
28.7
24.7
20.0
25.9
- ' 40.8 ;
23.4
29.8
19.7
24.4
_,
20.0
27.5
29.2
27.1
25.5
, '' $ ',
' , ,
24.3
f f f * '
f * ' ' *
26.8
f .*** _,
21.4
" ''/ " '" '; "',
22.8
' ' ''
25.6
25.6
21.5
22.9
25.9
f
24.7
26.7
12.6
f
Res. 2
22.6
25.2
', /, ,""'!;
17.3
25.0
28.8
20.4
22.0
25.3
/, 42.$
24.7
29.1
20.3
24.6
'''
,' -
19.0
29.4
30.7
25.3
25.8
f '
"''/
' * f f
26.6
ff
-s ' " 'i.
26.7
ff ' ^
ff* f f f
21.9
'', '"+';''', ''"'
23.3
' ..
26.3
26.2
21.1
21.7
25.0
X
29.3
29.5
14.6
'"
Res. 3
19.6
25.5
';''-&-'*
is"o
24.9
28.8
21.5
20.0
24.2
/ ' ** ttttf ja
* ** *P w j&3(
24.2
31.5
20.1
25.0
^
> ' ' ' '* -
20.0
34.9
30.5
26.2
25.2
'" " > "
x f f f
' '<- - ',- :
25.0
/-/ '; '-': -//,
''''' ' ", '
27.2
f : f* S
22.4
t'fffi fffffjff
20.2
j, j. f
26.0
25.6
20.9
22.5
25.4
f ff
29.5
26.0
13.0
,
= No data submitted
0 s
Insufficient
data
X S
Exper.
Sigma
1.65
0.62
'-1""', \ ''>'-/
2.14
0.21
0.06
2.23
1.15
0.86
'»' ~%M?
0.66
1.23
0.31
0.31
/ *
/^
0.58
3.84
0.81
0.90
0.30
' '»
'
1.18
'
'
0.26
, ,
0.50
' '
1.66
,;
0.35
0.35
0.31
0.61
0.45
2.72
1.85
1.06
Rng anal
(R + SR) Average
0.479
0.192
' ' '#' '/. '* ^ ',
'/ ' S' -"
0.639
0.064
0.016
0.686
0.319
0.271
; flt^wK- - -,
0.208
0.383
0.096
0.096
',
^ f Jf> ,
0.160
1.345
0.239
0.287
0.096
*, ' -' '.,
f f f f-
0.367
/
* f s
0.080
'' /
0.160
'..'" ''*, ' ' '/,
0.495
*
0.112
0.096
0.096
0.192
0.144
0.766
0.559
0.319
*
21.50
25.00
"$ /' ' '
18.87
25.07
28.77
22.20
20.67
25.13
4ia
24.10
30.13
20.03
24.67
/ ,
' '/
19.67
30.60
30.13
26.20
25.50
*
25.30
',
"-
26.90
' ,;,;
21.90
f X f 'f
22.10
25.97
25.80
21.17
22.37
25.43
'' ,
27.83
27.40
13.40
TAG SYMBOLS
Determined
to be an outlier
Normalized deviation
(grand-avg) (known) Tag
-1.25
0.39
'Jta^t&'t"^'',
-2.48 "
0.42
2.15
-0.92
-1.64
0.45
-' - , 'fAT
-0.03
2.79
-1.94
0.23
' ' '
,
-2.11
3.01
2.79
0.95
0.62
f ^ f * f
'<
0.53
, - / ,
1.28
'*, ' ' '
\' ,:1.06^
-f"//'" '"" ,"" *
-0.97
'
0.84
0.76
-1.41
-0.84
0.59
'
1.71
1.51
-5.04
'
tt = Above
11 s Below
-1.59
0.05
* '$%>,£'' **'-..
-2.82
0.08
1.81
-1.26
-1.98
0.11
-7.ifc' ,x
-0.37
2.45
-2.28
-0.11
' - - , *'
*
-2.45
2.67
2.45
0.61
0.28
, , ' ,
*
,, ' * '
0.19
* .. *
*
0.94
v , *
*
-1.40
«M~:si *
-1.31
*
0.50
0.42
-1.75
-1.19
0.25
*
1.37
1.17
-5.38 II
»
control limit
control limit
-------
5/13 EM8L-LV Intel-comparison Study: Radium in Water, 17-Jul-1992
Radium-226
Lab Res. 1
PX
Q
QB
QQ
QU
QX
QY
QZ
R
RA
RC
RD
RF
RM
RV
RW
RZ
S
9A
SC
SD
SF
SI
8L
SM
SS
m
m
sz
T
TA
S
TI
TO
IK
TQ
TS
U
w
=
0 s
27.0
25.9
22.5
15.0
24.6
26.1
23.8
22.8
25.3
16.0
24.9
34.8
26.9
19.0
27.3
21.6
26.8
27.7
28.5
17.7
-
25.2
24.3
fj
23.7
25.3
22.7
16.2
4.9
22.7
28.0
25.0
24.2
Res. 2
25.7
25.9
20.3
14.6
24.8
27.4
23.7
24.4
25.1
19.6
25.8
33.5
31.8
21.9
30.6
22.0
26.2
'
26.0
34.7
17.1
29.2
23.7
; x »j -
f *f *
24.7
24.8
23.4
ff f ""
20.4
'
ft*
23.8
-
20.6
26.4
Res. 3
27.0
24.7
20.6
>
13.8
24.1
26.4
23.5
24.1
24.4
17.1
23.2
33.5
29.9
17.5
30.7
22.2
26.3
A
25.7
27.7
17.8
-
28.1
22.4
-s '"'*?
25.9
25.9
23.4
23.5
'**
24.0
'
23.3
25.7
No data submitted
Insufficient
data
x =
Exper.
Sigma
0.75
0.69
1.19
0.61
0.36
0.68
0.15
0.85
0.47
1.84
1.32
0.75
2.47
2.24
1.93
0.31
0.32
1.08
3.83
0.38
' , "
2.07
9.97
d-
* ,' *"
'.*,
1.10
0.55
0.40
-
3.66
u»
0.70
'
2.22
1.12
Rng anal Normalized deviation
(R + SR) Average (grand-avg) (known) Tag
0.208
0.192
0.351
0.192
0.112
0.208
0.048
0.255
0.144
0.575
0.415
0.208
0.782
0.702
0.543
0.096
0.096
0.319
1.224
0.112
0.639
0.303
0.2X)8
..
0.351
0.176
0.112
1.315
&M7
0.208
0.702
0.351
26.57
25.50
21.13
14.47
24.50
26.63
23.67
23.77
24.93
17.57
24.63
33.93
29.53
19.47
29.53
21.93
26.43
'
26.47
30.30
17.53
'
27.50
23.47
24.77
25.33
23.17
20.03
4.33
23.50
22.97
25.43
TAG SYMBOLS
Determined
to be an
outlier
1.12
0.62
-1.42
-4.54
0.15
1.15
-0.24
-0.19
0.36
-3.09
0.22
4.57
2.51
-2.20
2.51
-1.05
1.06
1.07
2.87
-3.11
1.56
-0.33
*tm - -
', -
0.28
0.54
-0.47
-1.94
**»
-0.31
-0.56
0.59
ft 3 Above
II = Below
0.78
0.28
-1.76
-4.88 T
-0.19
0.81
-0.58
-0.53
0.02
-3.43 U
-0.12
4.23 ft
2.17
-2.54
2.17
-1.39
0.72
»
0.73
2.53
-3.45 11
*
1.22
-0.67
", *
-0.06
0.20
-0.81
*
-2.28
* :
0.63 x
-0.66
0
-0.91
0.25
control limit
control limit
-------
EMSL-LV Intercc
Radium-226
Lab Res. 1 Res. 2
X 24.7 27.3
Y 24.7 20.7
'mpariffon Study; Radium
Exper. Rng anal
Res. 3 Sigma (R + SR)
30.4 2.85 0.910
20.4 2.40 0.686
in Water, 17-Jul-1992 6/13
Normalized deviation
Average (grand-avg) (known)
27.47 1.54 1.20
21.93 -1.05 -1.39
'
Tag
Data sorted by Laboratory Average
Average Tag
4.33 x
8.67 x
11.67 x
13.40 U
14.47 U
16.83 U
17.10 U
17.53 11
17.57 U
18.87
19.47
19.63
19.67
20.03
20.03
20.63
20.67
20.90
21.13
21.17
21.27
21.50
21.63
21.90
21.93
21.93
22.10
22.20
22.33
22.33
22.37
22.53
22.63
22.90
s No data submitted
0 = Insufficient data
Lab
TN
SW
CK
PV
QU
AW
AK
SI
RC
ID
RV
BG
LS
H
KZ
HL
JS
DB
QB
OY
BC
HY
BH
NT
Y
RZ
OF
JG
CA
BM
P
CE
DE
AF
Average Tag
22.93
22.93
22.97
23.17
23.33
23.47
23.50
23.67
23.73
23.77
24.10
24.13
24.17
24.17
24.27
24.33
24.37
24.50
24.63
24.63
24.63
24.67
24.70
24.70
24.77
24.77
24.77
24.87
24.90
24.93
25.00
25.00
25.07
25.07
TAG SYMBOLS
Lab
C
AL
U
TA
CJ
88
TQ
QZ
GQ
R
K
CG
HK
BL
E
FE
AE
QX
RD
CS
BO
L
EO
DZ
SZ
BK
BA
AI
DT
RA
I
AJ
J
AZ
Average Tag
25.13
25.17
25.30
25.33
25.37
25.43
25.43
25.50
25.50
25.80
25.97
26.20
26.43
26.47
26.57
26.63
26.90
27.20
27.40
27.47
27.47
27.50
27.83
28.50
28.57
28.77
29.53
29.53
30.13
30.13
30.30
30.60
33.93 ft
35.67 ft
40.13 x
ft s Above control
Lab
JX
A
N
T
ER
W
PB
Q
ME
OX
OS
M
S
sc
PX
QY
NG.
AP
PP
X
HE
SM
PG
HP
FN
JE
RW
RM
LZ
KL
SD
LT
RF
FP
JY
limit
x = Determined to be an outlier $ & Below control limit
-------
7/13 EMSL-LV Intel-comparison Study: Radium in Water, 17-Jul-1992
Radium-226
% Frequency distribution of responding labs(expected prec. vs known value)
10- - -
* -' exp.prec. -2 ' ^6^ ' +2 exp.prec. * ' *
value
% Frequency distribution of responding labs(std. dev. vs mean value)
10-"
OJ^
std. dev. -2 0 +2 std. dev.
mean
value
-------
EMSL-LV Intel-comparison Study: Radium in Water, 17-Jul-1992
8/13
Radium-228
Statistical Summary
137 Participants
The known value of this nuclide is 16.7 pCi/1 with an expected precision of 4.2; the control limits
are 9.4 to 24.0; the warning regions are 9.4 to 11.8 and 21.6 to 24.0
48(35.0 %) Failed to respond ;
4(2.9 %) Out of control *
but not an outlier
Statistic
. 78(56.9 %) Within all limits
Respondents
7(5.1.%) 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
16.25
3.27
10.69
20.12
-2.72
-0.14
16.37
-2.00
-0.10
Grand Avg 16.25
3.27
10.69
20.12
-2.72
-0.14
16.37
-2.00
-0.10
4(4.5 %) Mora than 3 norm. S.D. -,^
7(7.9 %) Between 2 and 3 norm. S.D.
57(64.O %) Within 1 norm. S.D.
of known value
21(23.6 %) Between 1 and 2 norm. S.D.
-------
9/13 EMSL-LV Intel-comparison Study: Radium in Water, 17-Jul-1992
Radium-228
Lab
A
AE
AF
AI
AJ
AK
AL
AP
AW
AZ
BA
BC
BG
BH
BK
BL
BM
BO
C
CA
CE
CG
CJ
CK
CS
DB
DE
DT
DZ
E
urtt
*MP
USH?'
mrrmm.
EO
ER
FE
FN
FP
GG
08t
GQ
TTK
HK
HL
HP
TO
Res. 1
16.2
13.4
16.6
17.3
16.9
15.4
19.4
23.5
17.7
18.0
17.7
19.8
f
14.9
14.6
17.2
16.8
18.1
15.8
20.0
15.2
17.0
8.5
7.4
16.1
15.2
17.3
12.8
''
15.7
15.9
.. ,-
18.0
13.3
11.1
12.2
15.7
9.8
14.5
Res. 2
16.0
12.8
18.6
14.0
17.4
16.0
15.8
17.6
18.5
16.4
15.5
17.3
16.5
14.8
-
16.9
14.8
17.4
15.9
20.3
11.9
18.0
8.7
6.5
16.8
15.2
19.7
12.7
' ' '
' '
15.6
15.3
.. '
16.8
10.4
11.3
12.0
15.4
9.8
14.5
Res. 3
15.5
12.0
16.4
17.5
17.8
16.3
20.4
15.8
17.2
14.7
16.1
21.0
'
18.9
15.5
17.3
16.1
16.8
18.5
19.7
13.3
17.0
8.3
6.8
17.3
15.3
20.2
12.9
'"
-------
EMSL-LV Intel-comparison Study: Radium in Water, 17-Jul-1992
10/13
Radium-228
Lab
-By;
i
fa
ID
J
JE
JG
JS
JX
JY
K
KL
KZ
L
LB
IM
LS
LT
TM
M
ME
MN
MO
MS
MT
N
HA
NE
NG
NT
N#-
OF
0S£
OS
ox
OY
P
PB
FB
PCt
PP
PV
PW
=
0 a
Res. 1
, ' ';,/"; ?%; y ;
14.8
11.3
18.3
16.6
15.2
12.0
20.3
16.6
11.8
21.5
16.0
15.8
28.0
16.9
'
21.4
15.1
,,
' ' 'a
f
' ' ,', ',
18.0
' ' " '' ', ''',
11.5
18.4
' ' '''"' '
18.5
/
19.8
17.1
20.1
18.5
16.8
'
/ ,
11.1
f * *
Res. 2 Res. 3
f >
21.1
15.2
, ; f.
>'*? - , '
17.7
* ,
f ff f
12.5
17.9
f tyf f f
20.2
j. *
19.2
16.5
21.7
23.1
17.6
_.
15.8
,
No data submitted
Insufficient
data
x =
Exper. Rng anal Normalized deviation
Sigma (R + SR) Average (grand-avg) (known) Tag
.-. ' /ff /f
2.14
0.57
0.40
1.66
1.14
2.00
1.52
2.35
2.54
1.21
3.06
0.17
4.04
0.80
, ; ' ,
0.35
1.13
'' f
' /
* ' f * *
0.21
'
, - *
0.53
x1 ' jjf
0.25
* j.ff f
1.55
0.65
0.50
0.81
2.39
0.40
'
2.35
'v'ii^V
0.520
0.155
0.098
0.436
0.295
0.563
0.422
0.661
0.703
0.338
0.816
0.042
1.238
0.225
'
0.098
0.281
/ '
',
' ''
0.056
0.141
"'
0.070
0.436
0.183
0.141
0.225
0.647
0.113
0.661
'^iA?t"%;"''^'!
" 17.27
f f Aft f " S sf t
11.93
18.53
18.50
14.70
14.00
18.93
18.87
14.03
22.60
14.87
15.70
24.33
16.07
, \
21.07
15.80
' - / '.*>''-
'
$ <
17.93
, ''
11.90
''
18.13
*,' / '' / ';
18.60
.
19.17
16.57
20.83
21.17
17.20
'
13.37
TAG SYMBOLS
Determined to
bean
outlier
/£&%', '&,"
0.42
-1.78
0.94
0.93
-0.64
-0.93
1.11
1.08
-0.91
2.62
-0.57
-0.23
3.34
-0.07
*,
1.99
-0.18
-,
- ', /
0.70
--
-1.79
0.78
/ _,
0.97
.
1.20
0.13
1.89
2.03
0.39
-1.19
11 = Above
& = Below
vV;'C'>*v-
0.23
' ' j'Y' %. »'/'
-1.97
0.76
0.74
-0.82
-1.11
0.92
0.89
-1.10
2.43
-0.76
-0.41
t-
3.15 ₯
-0.26
- / " *
1.80
-0.37
*
m
, *
0.51
*
-1.98
*
0.59
4-
0.78
*
1.02
-0.05
1.70
1.84
0.21
*
*
-1.37
control limit
control limit
-------
11 /
13 EM8L-LV Intercomparison Study: Radium in Water, 17-Jul-1992
Radium-228
Lab
PX
IT
Q
fVCk
*&9
QQ
QU
QX
QY
QZ
It
BA
RC
RD
RF
RM
RV
RW
RZ
S
SA
SC
SD
-------
EMSL-LV Intercomparison Study: Radium
in Water, 17-Jul-1992 12
/IS
Radium-228
Lab
X
Exper. Rng anal
Res. 1 Res. 2 Res. 3 Sigma (R + SR)
24.4 _ 26.0 ff ^27.7 ,\£*.m , 5^L»
Normalized deviation
Average (grand-avg) (known)
26.03 f ^ f m 4.04 f _ ff ^3.85^
Tag
J_
Data sorted by Laboratory Average
Average
6.90
8.50
9.80
9.93
11.73
11.77
11.80
11.90
11.90
11.93
12.03
12.30
12.67
12.73
12.80
13.00
13.37
13.47
14.00
14.03
14.30
14.50
14.50
14.50
14.70
14.80
14.87
14.97
15.10
%
10" - -
-6
Tag Lab
U C8
U CK
HL
RF
HE
GQ
FP
TI
NG
n>
QU
RV
RW
AE
DZ
U
PV
CG
JS
K
Q
T
SI
HP
JG
HK
KZ
BK
S
Average Tag
15.23
15.43
15.47
15.60
15.70
15.73
15.80
15.90
15.90
15.90
15.97
16.07
16.27
16.30
16.37
16.37
16.43
16.57
16.63
16.67
16.70
16.73
16.73
16.77
17.07
17.13
17.20
17.20
17.27
17.33
Lab
DE
EO
ER
TQ
L
RM
ME
BO
AK
A
SD
LT
AI
QY
W
AZ
BA
OX
RZ
TA
SC
DB
CA
BH
QZ
BM
PB
AF
I
RD
Average Tag
17.33
17.37
17.43
17.67
17.80
17.93
18.13
18.13
18.23
18.50
18.53
18.53
18.60
18.80
18.87
18.93
18.97
19.07
19.17
19.37
19.67
20.00
20.83
21.07
21.17
21.37
22.20
22.60
24.33 ft
26.03 ft
Lab
CJ
AJ
C
FN
AW
N
RC
NT
SW
JE
J
AL
OF
ss
JY
JX
AP
DTL
OS
BC
SM
CE
OY
M
P
SZ
QX
KL
LS
X
Frequency distribution of responding labs(expected prec. vs known value)
T - |-l.-|lllllml|-
"4 exp.'prec. '2 ^J^
value
s No data submitted TAG SYMBOLS
_ ___ _ -
+2 exp. prec. *4
ft s Above control
0 3 Insufficient data x & Determined to be an outlier U s Below control
+6
limit
limit
-------
13/13
EMSL-LV Intel-comparison Study: Radium in Water, 17-Jul-1992
Radium-228
Frequency distribution of responding labs(std. dev. vs mean value)
10-
-*
-4 std. dev. -2
mean
value
+2 std. dev. +4
+6
------- |