54733-10BA2L
1 – 114 02.2017
9 Radiation Protection Volume 1
Distance This means the distance between the radioactive source and the
human body. The radiation intensity (dose rate) decreases – like
light – in proportion to the square of the distance, i.e. doubling the
distance to the source reduces the dose rate to one quarter.
Conclusion:
Maximum distance should be maintained when working in the vicin-
ity of equipment containing radioactive material. This is especially
true for persons that are not directly involved in this work.
Time The total time a person stays in the vicinity of a radiometric mea-
suring system and the body is exposed to radiation. The effect is
cumulative and increases therefore with the duration of the radia-
tion exposure.
Conclusion:
Any work in the vicinity of radiometric measuring system must be
prepared carefully and organized such that it can be carried out in
the shortest time possible. Having the proper tools is of particular
importance.
Shielding The material surrounding the source provides the shielding effect.
As the shielding effect depends, following an exponential function,
on the product of thickness multiplied by the density, it follows that
materials with a high specific weight are to be used for shielding
purposes. The device designer usually calculates suitable dimen-
sions.
Conclusion:
Before mounting or dismounting the shielding, make sure that the
radiation exit channel is locked in the closed position.
During use Installation, dismantling, relocation, maintenance, testing involving
the radioactive source and its shielding shall ONLY be performed
under the supervision of the Radiation Safety Officer.
For more information please contact BERTHOLD TECHNOLOGIES.
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