Density Meter LB 444 SECTION 9. RADIATION PROTECTION
85
Safety Instructions
Shielding Installation
ONLY persons specifically licensed by the US Nuclear Regulatory Commission
or an Agreement State may install, move, repair or relocate a device or shielding
containing a radioactive source.
The work must be performed according to the instructions and under the super-
vision of the Radiation Safety Officer.
It has to be ensured that
&
the lock of the shielding is closed and secured, so that no unshielded radia-
tion can exit
&
the shielding is not modified or damaged
&
the function of the locking mechanism is checked following installation of
the shielding
&
the function check is repeated every six months
&
a new source number has to be attached on the shielding or the type label
replaced when replacing a source.
Point Source Replacement
ONLY
persons specifically licensed by the US Nuclear Regulatory Commission
or an Agreement State may replace radioactive sources. This means that these
persons have to work with an unshielded source for a short time. Therefore, they
have to carry a pocket dosimeter indicating the level of radiation, so that the ac-
tual radiation exposure during this work can be documented.
Point sources have to be fixed on a source holder which are then screwed into
the shielding, positioning the source in the center of the shielding.
Prerequisite
for this work is that the personnel is familiar with the exact shielding con-
struction; therefore, the respective drawings must be available.
Preparation
All necessary work has to be prepared such that it can be carried out quickly, so
that exposure to the unshielded source is kept to a minimum. Using a drawing of
the shielding, you should plan the best procedure and have the following tools
handy: You must wear a personal dosimeter.
a) Allan keys and wrenches of the required size.
b) 2 pairs of pliers to take hold of source and source holder.
c) Replacement labels and rivets.
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