Density Meter LB 444 SECTION 9. RADIATION PROTECTION
86
IF YOU ARE LICENSED:
If sufficient space is available, the source can be replaced in the shielding in-
stalled at the measuring location. To this end, bring the new source in its trans-
port shielding close to the measuring location. Prepare a suitable, clean space, if
possible with an auxiliary shielding (shielding vessel, lead bricks, concrete
stones, etc.) and place the source holder and the source there on a piece of pa-
per to protect it against dirt.
Depending on the construction, you either have to open the lock on the shielding
and turn the lever to center position between ON and OFF until the hexagon
head bolt of the source holders becomes visible, or remove the locking plate, so
that you can unscrew the source holder.
Source Replacement
Proceed as follows for standard point source shieldings (Figure 30):
1. Open the lock of the shielding (1) halfway, so that you can unscrew the
source holder (2) together with the source (3) using a socket wrench.
2. You may touch the source holder at the far end of the threaded part with your
hands. Hold it far away from your body and put it down behind an auxiliary
shielding.
3. Unscrew the source from the source holder using a socket wrench (SW 10).
Hold the source holder using a second socket wrench (SW 12). For this work,
you should use the shielding housing as auxiliary shielding between source
and body.
3
2
1
Figure 30: Source holder
4.
Take hold of the source using a pair of pliers and put it into the transport
shielding or another shielding
immediately.
Do not touch the source to prevent a high partial body dose. Make sure the
source is not mixed up with the new or another source.
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