Chapter 2 Safety
Mini-Switch LB 471
2.6 Safety Installations
2.6.1 Source Shieldings
The shielding with the source installed may be taken into opera-
tion by specially licensed persons who have been trained on han-
dling radioactive materials only after consultation and coordination
with the radiological safety officer.
The radiation exit channel must only be opened by authorized per-
sons after consultation with the radiological safety officer.
Modification of or tampering with the shielding construction are
prohibited.
Co-60 or Cs-137 point sources
are used for the system. They
are tightly welded into a sturdy stainless steel capsule, so that the
radioactive substance cannot escape and contamination is pre-
vented. The capsule with the source
is fixed on a holder
and
installed into the shielding.
The shielding consists of a lead cylinder with radiation exit channel
, surrounded by a steel jacket. The locking core
is fixed to a
lever
. The padlock
secures the open / closed position and
protects the source against unauthorized removal.
Locking core
Radiation channel
Point sources
Source holder
Lever
Padlock
Cover plate front
When turning the lever
, the locking core is rotated as well and
the radiation exit channel is opened towards the detector. The ar-
row on the lever
is pointing towards “OPEN”.
Figure 1:
Point source shielding
radiation channel open
Sectional drawing
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