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External and Internal Radiation Dose Reduction cont'd |
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|  DOE-HDBK-1130-98
Module 4: ALARA Program
Instructor's Notes
b.
Methods for maximizing distance from sources of
EO4 Identify methods for
radiation
reducing external and
internal radiation dose.
The worker should stay as far away as possible from
the source of radiation.
DR: Dose Rate
1)
Stay as far away from radiation sources as practical
given the task assignment. For point sources (such
as valves and hot spots), the dose rate follows a
DRA=
principle called the inverse square law. This law
states that if you double the distance, the dose rate
falls to 1/4 of the original dose rate. If you triple the
2
DRB x Distance A
distance, the dose rate falls to 1/9 of the original
Distance2 B
dose rate.
2)
Be familiar with radiological conditions in the area.
3)
During work delays, move to lower dose rate areas.
4)
Use remote handling devices when possible.
5)
(Insert facility-specific information.)
c.
Proper uses of shielding
Shielding reduces the amount of radiation dose to
EO4 Identify methods for
the worker. Different materials shield a worker from
reducing external and
the different types of radiation.
internal radiation dose.
1)
Take advantage of permanent shielding, such as non-
radiological equipment/structures.
2)
Use shielded containments when available.
3)
Wear safety glasses/goggles to protect your eyes
from beta radiation, when applicable.
4)
Temporary shielding (e.g., lead or concrete blocks)
can only be installed when proper procedures are
used.
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