Berthold LB 134 - Page 135

LB 134 11. Appendix
125
LB 1342
6)
Limit
values
1)
Efficiencies, response, calibration factors and
decision thresholds and detection limits
ISO 7503-1
3)
Nuclide
CH
eff
src
in
Bq/cm²
Efficiency
in
%
Response
in
s
-1
Bq
-1
cm
2
Calibration
factor in
s Bq cm
-2
Decision thr.
in
Bq/cm²
5)
Detection limit
in
Bq/cm²
4)5)
I-131
b-g
0.50
10
74.4
63.24
0.016
0.017
0.034
Cs-137+
b-g
0.50
1
70.6
60.01
0.017
0.018
0.036
Pm-147
b-g
0.25
1
28.9
12.27
0.082
0.085
0.173
Sm-153
b-g
0.50
10
84.8
72.06
0.014
0.014
0.030
Er-169
b-g
0.25
100
61.4
26.11
0.038
0.039
0.080
Re-186
b-g
0.50
1
68.1
57.88
0.017
0.018
0.036
Re-188
b-g
0.50
10
75.6
64.24
0.016
0.017
0.034
Au-198
b-g
0.50
10
74.1
63.00
0.016
0.017
0.034
Tl-201
b-g
0.50
10
2.8
2.36
0.423
0.436
0.894
Tl-204
b-g
0.50
100
65.8
55.94
0.018
0.019
0.038
U-238sec
b-g
0.25
1
107.3
45.61
0.022
0.023
0.047
Pu-238
b-g
0.25
0.1
7.8
3.31
0.302
0.311
0.638
Am-241
b-g
0.25
0.1
11.8
5.01
0.200
0.206
0.423
Po-210
a
0.25
1
42.3
17.99
0.056
0.006
0.017
U-238sec
a
0.25
1
62.0
26.34
0.038
0.004
0.012
Pu-238
a
0.25
0.1
44.5
18.92
0.053
0.006
0.016
Pu-239
a
0.25
0.1
35.9
15.25
0.066
0.007
0.021
Am-241
a
0.25
0.1
43.6
18.51
0.054
0.006
0.017
Alpha
a
0.25
40.0
17.00
0.059
0.007
0.018
1) Limit values taken from the German Radiation Protection Ordinance 2001, Annex III, Table 1, column 4
3) Values relative to the surface emission rate and 170 cm² sensitive detector area according to DIN ISO 7503-1
4) Decision threshold and minimum detectable activity (MDA) are in accordance with ISO 11929-1
calculated with a measuring time of 200 s for the background and 30 s for the sample measurement
5) Background count rate used from 0.1 cps for alpha and to 10 cps for beta-gamma measurements
6) Valid from LB 134 software version 1.00