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DOE-HDBK-1106-97
Lesson Plan
Instructor's Notes
C. Measuring Radioactive Contamination
EO3: IDENTIFY the
Because radioactive contamination is radioactive material,
units used to measure
the units are the same, e.g., disintegrations per minute
Radioactive contamination.
(dpm).
When measuring the amount of radioactive contamination
(material) on a surface, the units most commonly used are
disintegrations per minute per 100 centimeters squared
(dpm/100 cm2).
1. Direct reading
Contamination monitors measure radiation emitted by the
radioactive material. The units are normally counts (as
seen by the monitor) per minute (cpm).
2. Discuss counts per minute (cpm) versus disintegrations per
minute (dpm).
Explain counter efficiency.
There is a direct relationship between the counts recorded
and the actual activity (disintegrations) present. The
counter efficiency (expressed as the ratio of cpm/dpm) is
divided into the measured cpm to obtain the activity.
10


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