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12.3 Radiation Dose Calculations
112
12.3 Radiation Dose Calculations
When preparing work on radiometric measuring systems, it is im-
portant to calculate the radiation exposure to be expected in ad-
vance, for this has consequences on the required safety precau-
tions.
The expected radiation exposure can be calculated quite easily and
with sufficient accuracy, provided you know the isotope and the
activity of the source used. You can take this information from the
source documentation or from the type label on the shielding.
The radiation exposure to be expected for a shielded source is cal-
culated as follows:
s
r
t
k
A
=
D
Dose
2
⋅
⋅
⋅
A is the activity of the source and k the respective specific Gamma
radiation constant (see the table below). The distance from the
measuring point to the source is r and the duration of stay at this
point is t. s is the shielding factor of the shielding used; it is listed
in the shielding brochure or can be calculated. s = 1 when calculat-
ing the dose rate for work with an unshielded source.
NUCLIDE
k
DIMENSIONS
Co-60 0.35
Cs-137 0.09
Sv * m
h * MBq
µ
2
Calculation example
The dose in a distance of 50 cm of a Co-60 source with an activity
of 350 MBq and a time of 30 minutes in this distance has to be cal-
culated. The source is shielded by a shielding with a shielding fac-
tor of 30:
Sv
8.2
=
30
MBq
)
5
.
0
(
5
.
0
35
.
0
350
2
2
⋅
⋅
⋅
⋅
⋅
⋅
=
h
m
h
m
Sv
MBq
D
µ
Содержание LB 442
Страница 1: ...Radiometric Bulk Flow Meter LB 442 Id No 32815BA2 Rev Nr 02 10 10 2001...
Страница 2: ......
Страница 117: ...Section 13 Appendix 115 Section 13 Appendix 13 1 Certificates 13 1 1 ATEX Certificate for Evaluation Unit...
Страница 118: ...13 1 Certificates 116...
Страница 119: ...Section 13 Appendix 117...
Страница 120: ...13 1 Certificates 118...
Страница 121: ...Section 13 Appendix 119...
Страница 122: ...13 1 Certificates 120 13 1 2 ATEX Certificate for Detector...
Страница 123: ...Section 13 Appendix 121...
Страница 124: ...13 1 Certificates 122...
Страница 125: ...Section 13 Appendix 123...
Страница 126: ...13 1 Certificates 124 13 1 3 ATEX Certificate for Wall Housing...
Страница 127: ...Section 13 Appendix 125...
Страница 128: ...13 1 Certificates 126...
Страница 129: ...Section 13 Appendix 127 13 1 4 Declaration of Conformance...
Страница 132: ...13 3 Tachometer Installation 130 13 3 Tachometer Installation...
Страница 133: ...Section 13 Appendix 131...
Страница 134: ...13 3 Tachometer Installation 132 13 3 1 Tachometer...
Страница 138: ...13 4 Mechanical Drawings 136 13 4 4 Free Fall Measurement...
Страница 139: ...Section 13 Appendix 137 13 4 5 Point Detector...
Страница 145: ...Section 13 Appendix 143 13 4 11 Evaluation Unit...
Страница 148: ...13 5 Wiring Diagram 146 13 5 3 19 Frame...