Model 3430 Plus & 3440 Plus
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 function allows the operator to view how the
decrease in the radiation intensity of the source affects gauge
density measurements. It displays the actual density standard count,
the predicted standard count, and the percent difference between the
two sets of counts. The gauge calculates the predicted standard
count based upon the density standard count at the time the gauge
was calibrated and the number of days that have elapsed since
calibration.
To access the Source Decay function, press 〈5〉 at the Extended
menu shown on page 9–1. The gauge displays:
To return to the Extended menu, press the 〈ENTER/START〉 or
〈ESC〉 key.
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