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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
(dpm).
contamination.
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
There is a direct relationship between the counts
efficiency.
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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