Compare the displayed activity with the decayed calibrated
activity (for an example of how to calculate a decayed activ-
ity see "Isotope Selection Key Calibration", later in this
chapter). For a properly calibrated source above 100 µCi,
the displayed value should be within a few percent of the
decayed calibrated value.
If you do not have a Cs-137 source, use a calibrat-
ed Co-57 source and press the $key to perform the
above steps.
STANDARD ACTIVITY MEASUREMENT
The following procedure allows you to make a typical
Activity Measurement with your Atomlab 100.
1) Place the radioisotope to be measured into the Sample
Holder and carefully lower it into the Chamber Well.
2) Press the Isotope Selection key corresponding to the
isotope to be measured.
3) The Activity Display should now show the activity of the
selected isotope.
MOLY BREAKTHROUGH TEST
A Moly Breakthrough test is an evaluation of the amount of
Mo-99 contamination in a vial or syringe of Tc-99m. Tc-99m,
a decay product of Mo-99, is obtained from a generator by
leaching it from the column of Mo-99 after it is formed.
The test method has been derived from the fact when
Mo-99 decays, high energy gamma photons (~750 keV)
are produced which can "breakthrough" a lead wall with a
thickness sufficient to totally absorb the lower energy
Tc-99m gamma. Therefore, when a Tc-99m source is placed
in a properly shielded lead container and inserted into the
Chamber Well of the Atomlab 100, any measured radiation
will be due to Mo-99 gamma transmission.
ATOMLAB Dose Calibrator Operation Manual Chapter 5
Biodex Medical Systems 5-4 Release 2.0
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