Automess 6150AD1 User Manual

the half-life of the check source (30 years in the case of Cs-137) and the period of time you want to
correct for. For Cs-137, you can take the correction factor c as a function of time from the table below.
Example (how to correct for the age of the check source):
age of check source: 5 years
=> correction factor c = 1.122 (see table below)
check reading R:
75 µSv/h
corrected check reading Rc :
75 µSv/h
1.122 = 84.15 µSv/h
Correction Factor c
for Cs-137 (half-life 30.0 years)
t is the period of time (in years) since the reference date
t / years
c
t / years
c
t / years
c
0.0
1.000
0.5
1.012
10.5
1.275
20.5
1.606
1.0
1.023
11.0
1.289
21.0
1.625
1.5
1.035
11.5
1.304
21.5
1.643
2.0
1.047
12.0
1.320
22.0
1.662
2.5
1.059
12.5
1.335
22.5
1.682
3.0
1.072
13.0
1.350
23.0
1.701
3.5
1.084
13.5
1.366
23.5
1.721
4.0
1.097
14.0
1.382
24.0
1.741
4.5
1.110
14.5
1.398
24.5
1.761
5.0
1.122
15.0
1.414
25.0
1.782
5.5
1.136
15.5
1.431
25.5
1.803
6.0
1.149
16.0
1.447
26.0
1.823
6.5
1.162
16.5
1.464
26.5
1.845
7.0
1.176
17.0
1.481
27.0
1.866
7.5
1.189
17.5
1.498
27.5
1.888
8.0
1.203
18.0
1.516
28.0
1.910
8.5
1.217
18.5
1.533
28.5
1.932
9.0
1.231
19.0
1.551
29.0
1.954
9.5
1.245
19.5
1.569
29.5
1.977
10.0
1.260
20.0
1.587
30.0
2.000
03/2004
Operating Manual 6150AD
Page
37
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Automess 6150AD1 Specifications

General

Brand	Automess
Model	6150AD1
Category	Measuring Instruments
Language	English