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2.4 Instrument Description
14
Shielding
The effectiveness of the shielding and the smooth operation
of the lock must be checked every six months!
Measuring frames for Co and Cs sources
are equipped with a
lead-filled steel pipe as shielding, the outer diameter being 105
mm, and a radiation exit channel having a width of 8 mm. When
the exit channel is closed, the radiation hits the steel shielding.
The open radiation exit channel is exactly aligned with the scintilla-
tion counter that is installed on the opposite side.
Measuring frames for Americium sources
do not require such
strict shielding precautions, since the radiation emitted by Ameri-
cium is much easier to shield off.
Radiation exit channel
40 mm
Changing
Distance from
Shielding with rod source
Opening/
the rod
bottom 40 mm
closing the
source
radiation exit
channel
Figure 5: Shielding in foot of measuring frame
On one side of the shielding (see Figure 5) there is the opening for
changing the rod source which is secured by a special lock and a
padlock.
Summary of Contents for LB 442
Page 1: ...Radiometric Bulk Flow Meter LB 442 Id No 32815BA2 Rev Nr 02 10 10 2001...
Page 2: ......
Page 118: ...13 1 Certificates 116...
Page 119: ...Section 13 Appendix 117...
Page 120: ...13 1 Certificates 118...
Page 121: ...Section 13 Appendix 119...
Page 122: ...13 1 Certificates 120 13 1 2 ATEX Certificate for Detector...
Page 123: ...Section 13 Appendix 121...
Page 124: ...13 1 Certificates 122...
Page 125: ...Section 13 Appendix 123...
Page 126: ...13 1 Certificates 124 13 1 3 ATEX Certificate for Wall Housing...
Page 127: ...Section 13 Appendix 125...
Page 128: ...13 1 Certificates 126...
Page 129: ...Section 13 Appendix 127 13 1 4 Declaration of Conformance...
Page 132: ...13 3 Tachometer Installation 130 13 3 Tachometer Installation...
Page 133: ...Section 13 Appendix 131...
Page 134: ...13 3 Tachometer Installation 132 13 3 1 Tachometer...
Page 138: ...13 4 Mechanical Drawings 136 13 4 4 Free Fall Measurement...
Page 139: ...Section 13 Appendix 137 13 4 5 Point Detector...
Page 145: ...Section 13 Appendix 143 13 4 11 Evaluation Unit...