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Biodex Medical Systems, Inc. © 2016 155
The Automated Decay Test allows the user to set the number of counting points and the
interval for each count that will be automatically taken. Once started, the Automated Decay Test
will take readings without intervention. The Automated Decay Test can be paused to use the
dose calibrator for measuring functions and still return to the Automated Decay Testing operation.
You can perform the automated decay linearity test taking readings by hours or half-life for the
isotopes to be used. You also have a choice for the calculation method using a normalized
reading or an averaging method for the calculation. These choices are made as part of setting the
test parameters prior to starting the linearity test. There is a <Setup Options> button that is part of
the setting test parameters. You can set the activity that you want the test to end below. The system
defaults to 10 µCi.
To Perform An Automated Decay Test:
1. From the Linearity Testing menu, select <Automated Decay Test>. The Automated Decay
Test screen is now displayed.
2. Select <Set Test Parameters>. The Automated Decay Test screen is displayed.
3. Select <Setup Options>. The Automated Decay Setup Options screen is displayed. From this
screen, you can decide to perform the test using any of several methods including:
• Normalized reading by hours: allows the user to set the reading interval at a set number of
hours and set the time to be used for the normalized reading.
• Normalized reading by half-life of the isotope selected: allows the user to set the reading
interval by half-life and select which half-life reading will be used as the normalized reading.
• Averaging calculation method with readings at a set number of hours: allows the user to
set the number of hours between readings before the system calculates the results using
the averaging method described in Appendix J, Linearity.
• Averaging calculation method by half-life: allows the user to set the number of half-lives
between readings before the system calculates the results using the averaging method
described in Appendix J, Linearity.
4. Touch to highlight the linearity calculation method desired, normalized reading or
averaging method.
5. Touch to highlight the reading interval units desired, by hours or by half-lives
6. Test Ends Below defaults to 10 µCi this can be changed by touching <Test Ends Below>,
which brings up a keypad to enter the activity at which the test should end. You can set this
number between 10 and 50 µCi.
7. Touch <Enter> to return to the Automated Decay Test set reading interval screen.
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