two standard ionization chambers. Together, the chambers
and the sources provide a high degree of accuracy and
redundancy. Periodically, the source activity is measured in
the two standard chambers and the results are compared to
the expected decayed activity.
The Atomlab Dose Calibrator must first pass all electronic
testing and operate for three days prior to calibration.
Calibration then takes place with the Co-60 working stan-
dard. The calibration value is stored in a special memory
chip on the chamber circuit board. Calibration is then veri-
fied by measuring the activity of all the working standards,
including Co-60, Cs-137, Ba-133, and Co-57.
Finally, a Tc-99m source in a 10 ml vial of saline is calibrat-
ed in the two standard ionization chambers. After calibra-
tion, the response to the Tc-99m standard is measured and
verified to be within 2%.
ATOMLAB Dose Calibrator Operation Manual Appendix F
Biodex Medical Systems F-2 Release 2.0
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