Berthold LB 134 - Page 137

LB 134 11. Appendix
127
LB 1342
6)
Limit
values
1)
Efficiencies, response, calibration factors and
decision thresholds and detection limits
A-100
2)
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
threshold
in
Bq/cm²
5)
Detection
limit
in
Bq/cm²
4)5)
Re-188
b-g
0.50
10
101.1
101.11
0.010
0.010
0.021
Au-198
b-g
0.50
10
37.8
37.77
0.027
0.027
0.056
Tl-201
b-g
0.50
10
1.4
1.39
0.719
0.741
1.521
Tl-204
b-g
0.50
100
37.2
37.15
0.027
0.028
0.057
U-238sec
b-g
0.25
1
48.1
48.12
0.021
0.021
0.044
Pu-238
b-g
0.25
0.1
3.6
3.63
0.276
0.284
0.583
Am-241
b-g
0.25
0.1
5.6
5.57
0.180
0.185
0.380
Po-210
a
0.25
1
21.6
21.60
0.046
0.005
0.014
U-238sec
a
0.25
1
27.8
27.79
0.036
0.004
0.011
Pu-238
a
0.25
0.1
20.7
20.68
0.048
0.005
0.015
Pu-239
a
0.25
0.1
18.3
18.29
0.055
0.006
0.017
Am-241
a
0.25
0.1
20.6
20.58
0.049
0.005
0.015
Alpha
a
0.25
20.0
20.00
0.050
0.006
0.016
1) Limit values taken from the German Radiation Protection Ordinance 2001, Annex III, Table 1, column 4
2) Values relative to the activity and 100 cm² source area (DIN 44801)
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