THE DETECTOR
The Atomlab Detector Unit is a well type ionization chamber
capable of measuring activity as low as 0.01 µCi and as
high as 9999. mCi of Tc-99m. The chamber is surrounded
on all sides and on the bottom with .25-inch lead to both
shield you from the source you are measuring and shield
the dose calibrator from any ambient radiation.
THE CHAMBER
The well type chamber was carefully selected to provide a
nearly "4 pi" measuring geometry which means that the
radiation detector nearly surrounds the radionuclide. This
allows the Atomlab Dose Calibrator to measure the activity
of a sample no matter what its volume or shape, as long as
it fits into the Chamber Well. This is necessary, for example,
when measuring syringe doses when the volume is unim-
portant.
CHAMBER WELL LINER
Placed within the well is a plastic liner to protect the cham-
ber from contamination in the event of the source leaking
during measurement.
CURRENT MEASUREMENT
The ionization current is measured by a microprocessor-
controlled high impedance electrometer located within the
base of the Detector Unit.
REAR PANEL
On the rear panel of the Detector Unit are the connectors
for power and data communication with the Display Unit.
The Detector Unit can be located up to three meters away
from the Display Unit.
ATOMLAB Dose Calibrator Operation Manual Chapter 4
Biodex Medical Systems 4-2 Release 2.0
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