biodex ATOMLAB 500, Operation And Service Manual, Page: 141 / 212

Figure 7.15. Half Life Verification Screen Ready for Test.
11. If desired, touch <Zero Background> along the bottom menu. The Zero Background screen
is displayed.
Figure 7.16. Zero Background Screen.
Touch <Zero Background> and the background count will begin. If there has been no
activity in the chamber, a “Completed” message is immediately displayed and the system
returns to the Half Life Verification screen.
12. Place the isotope sample into the dose calibrator chamber.
13. Touch <Start Recording> to take the first reading. The program will automatically record the
first activity and record the next activity reading at the programmed time. Leave the source
in the chamber and the system will complete the test. The time remaining is displayed for
each reading.
Figure 7.17. Half Life Verification Screen – Start Recording Function.
14. If <Abort Recording> is touched, the current test will be aborted.