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.
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