SOURCE DECAY
The strength of radioactive material is measured by its activity, or
rate of decay. This activity decreases with time. The length of time
it takes a given amount of radioactive material to decay to half of its
original strength is referred to as the half-life. The half-life of the
Am-241:Be source is 432 years. The half-life of the Cs-137 source
is 30 years.
The Source Decay feature allows the operator to view how the
decrease in the radiation intensity of the source affects gauge
measurements. It displays the actual standard count, the predicted
standard count, and the error between the two sets of counts. The
gauge calculates the predicted standard count by correcting the
calibration standard count for source decay.
To access the Source Decay feature, press the 〈SPECIAL〉 key. At
the Special functions menu, access the Gauge Status/Test menu by
pressing
〈2〉. At the Gauge Status/Test menu, press 〈6〉 Source
Decay.
To scroll through the displays, press the 〈ENTER〉 key. After
displaying all the displays, the gauge returns to the Ready screen.
Predict D1 Std:xxxx
%
Difference: xx.x%
Press
ENTER
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