biodex ATOMLAB 500, Operation And Service Manual, Page: 91 / 212

Accuracy Test
For the Accuracy Test, three readings are completed and averaged. Accuracy means a
determination of the dose calibrator’s absolute error resulting from a measurement of a
suitable NIST - traceable radionuclide activity. Traceable sources are available from NIST and
from many radioisotope suppliers. At least two sources with different principal photon
energies (such as Co-57, Cs-137 or Co-60) should be used. One should have principal photon
energy between 100 keV and 500 keV.
Figure 6.31. The Accuracy Test Screen.
To Perform An Accuracy Test:
1. From the QA Dose Calibrator screen touch <Accuracy Test>. The Accuracy Test
screen is displayed (see Figure 6.31).
2. Touch <Select Sealed Source> and select the desired source as previously described.
Figure 6.32. Sealed Source List Screen.
NOTE: The user must have previously entered the sealed source into memory.
NOTE: The user can select a default sealed source to be the first source displayed when
the Constancy screen is entered. Set the default in Sealed Source Set Up. Otherwise, the
first source displayed will be the first source on the Sealed Source List.
3. Touch <Zero Background> to zero the background if desired.