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DOE-HDBK-1113-98
Module 104 Internal Dose Control
Lesson Plan
Instructor's Notes
iii. Monitoring Techniques
When performing personnel
monitoring it is very important to keep
the detector (i.e., the probe) close to the
surface being monitored and to move
the detector slowly. If the detector is
not held close to the surface being
monitored, the alpha particles may not
reach the detector. If the detector is
moved too quickly across the surface,
the electronics in the instrument will
not have time to respond to indicate the
amount of radioactive contamination
Discuss surface monitoring
present.
techniques based on the
audience makeup. For
The general method for personnel
example, general
scanning for alpha contamination is to
scan at approximately 2 inches/ sec at a  employees or radiation
workers may only be
distance of approximately inch. For
concerned with
personnel scanning for beta
personnel surveys, while
contamination, it is recommended to
radiological control
scan at 2 inches/sec at a distance of
technicians may be
inch. However, the surface being
concerned with equipment
surveyed (i.e., soil, building surfaces,
and building surface
equipment, personnel), the scanning
surveys as well as
speed, and the instrument response
personnel surveys.
time will determine the level of
contamination that can be detected.
54


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