abl and abh samples - national physical...
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ABL and ABH samples
NPL Environmental Radioactivity Comparison Workshop
Arvic Harms
21 February 2006
Radionuclides in ABL and ABH
• 7 nuclides:
55Fe, 89Sr, 90Sr, 238U, 238Pu, 239Pu and 241Am
• Two concentration levels:
ABL 1 – 20 Bq kg-1
ABH 1 – 20 Bq g-1
ABL and ABH composition
ABL (Bq kg-1) ABH (Bq g-1)
55Fe 15.8(3) 6.89(12)89Sr 17.8(3) 12.83(20)90Sr 8.900(19) 10.189(16)238U 1.24(3) 1.059(24)238Pu 15.28(5) 2.607(9)239Pu 13.29(6) 6.06(3)241Am 11.99(4) 3.691(13)
Treatment of data
(i) Deviation D from NPL value (%)
(ii) u-test (P = 0.01) and relative uncertainty ratio RR
u < 2.58 ‘in agreement’
u < 2.58 but RR is an outlier ‘possibly in agreement’
u > 2.58 ‘discrepant’
−=
−= 1100100
N
L
N
NLD
N
L
R2
N
2
LuL
uNR
uu
NLu =
+
−
=
Uncertainty ratio outlier
Relative uncertainty ratio U-238 ABL
0
5
10
15
20
Lab
8 MS
Lab
35La
b 8 A
S
Lab
56La
b 47
MS
Lab
29
Lab
34
Lab
40
Lab
17
Lab
13
Lab
4
Lab
22La
b 47
AS
Lab
25
Lab
28R
el.
un
cert
ain
ty r
ati
o
Fe-55 results
ABL
4 results
75% of the results ‘in agreement’
Deviation mean: (10 ± 29) % Deviation median: 13%
ABH
7 results
100% of the results ‘in agreement’
Deviation mean: (-1 ± 20) % Deviation median: 2%
Fe-55 ABL
Deviation Fe-55 ABL
-50
0
50
Lab
34
Lab
7
Lab
21
Lab
28
Devia
tio
n (
%)
Fe-55 ABH
Deviation Fe-55 ABH
-50
0
50
Lab
7
Lab
38
Lab
60
Lab
55
Lab
59
Lab
32
Lab
21
Devia
tio
n (
%)
Sr-89 results
ABL
5 results
60% of the results ‘in agreement’
Deviation mean: (-27 ± 71) % Deviation median: -10%
ABH
6 results
50% of the results ‘in agreement’
Deviation mean: (-8 ± 27) % Deviation median: -6%
Sr-89 ABL
Deviation Sr-89 ABL
-50
0
50
Lab
56
Lab
35
Lab
22 3M
Lab
22 Eic
h
Lab
21
Devia
tio
n (
%)
Sr-89 ABH
Deviation Sr-89 ABH
-50
0
50
Lab
22 3M
Lab
55
Lab
38
Lab
22 Eic
h
Lab
60
Lab
32
Devia
tio
n (
%)
Sr-90 results
ABL
13 results
46% of the results ‘in agreement’
Deviation mean: (1 ± 39) % Deviation median: -5%
ABH
13 results
54% of the results ‘in agreement’
Deviation mean: (3 ± 11) % Deviation median: 0%
Sr-90 ABL
Deviation Sr-90 ABL
-50
0
50
Lab
56
Lab
35
Lab
62
Lab
25La
b 22
3MLa
b 22
Eich
Lab
8
Lab
28
Lab
29
Lab
21
Lab
40
Lab
13
Lab
7D
evia
tio
n (
%)
Sr-90 ABH
Deviation Sr-90 ABH
-50
0
50
Lab
49La
b 22
Eich
Lab
22 3M
Lab
38
Lab
55
Lab
32
Lab
60
Lab
28
Lab
36
Lab
14
Lab
8
Lab
59
Lab
7
Devia
tio
n (
%)
U-238 results
ABL
15 results
80% of the results ‘in agreement’
Deviation mean: (0 ± 7) % Deviation median: -3%
ABH
13 results
85% of the results ‘in agreement’
Deviation mean: (-2 ± 6) % Deviation median: -3%
U-238 ABL
Deviation U-238 ABL
-50
0
50
Lab
29
Lab
22
Lab
13La
b 47
MS
Lab
56La
b 47
AS
Lab
17
Lab
34La
b 8 A
S
Lab
4
Lab
40
Lab
35La
b 8 M
S
Lab
25
Lab
28D
evia
tio
n (
%)
U-238 ABH
Deviation U-238 ABH
-50
0
50
Lab
28
Lab
47
Lab
60
Lab
17
Lab
55
Lab
38
Lab
21
Lab
22
Lab
59
Lab
32La
b 8 A
S
Lab
4La
b 8 M
SD
evia
tio
n (
%)
Pu-238 results
ABL
16 results
88% of the results ‘in agreement’
Deviation mean: (-5 ± 7) % Deviation median: -3%
ABH
14 results
79% of the results ‘in agreement’
Deviation mean: (5 ± 10) % Deviation median: 3%
Pu-238 ABL
Deviation Pu-238 ABL
-50
0
50
Lab
62
Lab
19
Lab
28
Lab
29
Lab
25
Lab
56
Lab
41
Lab
35La
b 40
Lab
4
Lab
22
Lab
13
Lab
8
Lab
34
Lab
47
Lab
17D
evia
tio
n (
%)
Pu-238 ABH
Deviation Pu-238 ABH
-50
0
50
Lab
49
Lab
28
Lab
55
Lab
60
Lab
59
Lab
47
Lab
22
Lab
38
Lab
4
Lab
32
Lab
17
Lab
8
Lab
14
Lab
21D
evia
tio
n (
%)
Pu-239 results
ABL
17 results
82% of the results ‘in agreement’
Deviation mean: (-0.5 ± 2.8) % Deviation median: 0%
ABH
13 results
92% of the results ‘in agreement’
Deviation mean: (-2 ± 10) % Deviation median: -1%
Pu-239 ABL
Deviation Pu-239 ABL
-50
0
50
Lab
62La
b 19
Lab
25La
b 40
Lab
56La
b 22
Lab
29La
b 47
Lab
41
Lab
8
Lab
4La
b 13
Lab
34La
b 26
Lab
35La
b 17
Lab
28D
evia
tio
n (
%)
Pu-239 ABH
Deviation Pu-239 ABH
-50
0
50
Lab
49
Lab
28
Lab
22
Lab
14
Lab
60
Lab
59
Lab
55
Lab
47
Lab
4
Lab
38
Lab
32
Lab
17
Lab
8D
evia
tio
n (
%)
Am-241 results
ABL
14 results
86% of the results ‘in agreement’
Deviation mean: (3.5 ± 3.8) % Deviation median: 3%
ABH
16 results
88% of the results ‘in agreement’
Deviation mean: (2.3 ± 4.4) % Deviation median: 1%
Am-241 ABL
Deviation Am-241 ABL
-50
0
50
Lab
47
Lab
41
Lab
25
Lab
22
Lab
13
Lab
17
Lab
28
Lab
21
Lab
42
Lab
4
Lab
40
Lab
29
Lab
34
Lab
26D
evia
tio
n (
%)
Am-241 ABH
Deviation Am-241 ABH
-50
0
50
Lab
14
Lab
60
Lab
38La
b 8 X
R2
Lab
32
Lab
59
Lab
22La
b 8 L
EPLa
b 8 X
R1
Lab
28
Lab
17
Lab
21
Lab
55
Lab
47
Lab
4La
b 8 A
SD
evia
tio
n (
%)
ABL summary
Results
76% ‘in agreement’
4% ‘probably in agreement’
20% ‘discrepant’
Problematic nuclides: 89Sr and 90Sr
Less problematic: 55Fe, 238U, 238Pu, 239Pu and 241Am
ABH summary
Results
79% ‘in agreement’
1% ‘probably in agreement’
20% ‘discrepant’
Problematic nuclides: 89Sr and 90Sr
Less problematic: 55Fe, 238U, 238Pu, 239Pu and 241Am
Mean deviation ABL and ABH with 99% confidence limits
Mean deviation ABL and ABH with 99% confidence limits
-50
0
50
Sr-89
L
Sr-89
HPu-
238 L
U-2
38 H
Pu-23
9 H
Fe-55
H
U-2
38 L
Pu-23
9 L
Sr-90
LAm
-241
H
Sr-90
HAm
-241
LPu-
238 H
Fe-55
LD
evia
tio
n (
%)
Median deviation ABL and ABH
Median deviation ABL and ABH
-50
0
50
Sr-89
L
Sr-89
H
Sr-90
LPu-
238 L
U-2
38 H
U-2
38 L
Pu-23
9 HPu-
239 L
Sr-90
HAm
-241
H
Fe-55
HPu-
238 H
Am-2
41 L
Fe-55
LD
evia
tio
n (
%)
Naji plot
Square of the absolute uncertainty ratio versus the z-score
The parabolae represent u-test values of 1.64, 1.96 and 2.58, (P = 0.10, 0.05 and 0.01, respectively)
Data points outside the area bounded by the u = 2.58
parabola are discrepant
2
2
=
−=
N
L
Nu
uR
u
NLz
A
Naji plot ABL
ABL
0
500
1000
-100 -50 0 50 100
z test value
(Ra)2
Naji Plot ABH
ABH
0
500
1000
-100 -50 0 50 100
z test value
(Ra)2
Pu-238 / Pu-239 ratio ABL
Pu-238 / Pu-239 ratio ABL
0.80
0.90
1.00
1.10
1.20
1.30
1.40
Lab
28La
b 35
Lab
29La
b 41
Lab
56La
b 25
Lab
4La
b 40
NPL
Lab
34La
b 13
Lab
17
Lab
8La
b 22
Lab
47La
b 62
Lab
19R
ati
o
Pu-238 / Pu-239 ratio ABH
Pu-238 / Pu-239 ratio ABH
0.30
0.35
0.40
0.45
0.50
0.55
0.60
Lab
49
Lab
55
Lab
47
Lab
17
Lab
60
Lab
59
NPL
Lab
8
Lab
38
Lab
32
Lab
22
Lab
4
Lab
28
Lab
14R
ati
o
Sr-90 2000-2005
Sr-90 2000-2005
-50
0
50
Devia
tio
n (
%)
2000-2003
2005
Pu-238 2000-2005
Pu-238 2000-2005
-50
0
50
Devia
tio
n (
%)
2000-2003
2005
Pu-239 2000-2005
Pu-239 2000-2005
-50
0
50
Devia
tio
n (
%)
2000-2003
2005
Am-241 2000-2005
Am-241 2000-2005
-50
0
50
Devia
tio
n (
%)
2000-2003
2005
Thank you