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18 ATOMLAB 500 DOSE CALIBRATOR
The system consists of a low pressure ionization chamber, electrometer with extraordinary
Linearity and an auto-ranging touch-screen color display. It provides fast, accurate radionuclide
measurements with performance that easily complies with the most stringent regulatory
requirements.
Activity measurements are performed by the microprocessor controlled electrometer located
within the chamber assembly. The chamber is shielded with .25" (6.3 mm) lead. It can be
located up to eight feet away from the display unit. Chamber bias is generated by an electronic
high voltage supply, eliminating the need for expensive battery changes. The display can rest on
a bench or mount on a wall.
Description
There are 12 isotope selection touch keys pre-programmed for the most commonly used radionu-
clides. Any of those keys can be reprogrammed by the user for a desired isotope. There are 88
isotope-specific dial values listed in the library. Dial values can easily be changed if required.
Activity is displayed on the touch-screen color display in either Curie or Becquerel units.
Background correction is performed at the touch of a button. Range selection is automatic from
.01 microcurie to 100 curies of Tc-99m or 25 curies of F-18.
The Detector
The Atomlab detector unit is a well type ionization detector capable of measuring activity as low as
0.01 µCi and as high as 100 curies of Tc-99m or 25 curies of F-18. The detector is surrounded on
all sides and on the bottom with .25-inch lead to both shield you from the source you are measur-
ing and shield the dose calibrator from any ambient radiation. The well type detector 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 detector well. This is
necessary, for example, when measuring syringe doses when the volume is unimportant. The
detector has electronics and the calibration built into it (the calibrator is built into the detector.)
Therefore, you can connect any Atomlab 500 display to a detector and have a calibrated system.
Detector Well Liner
Placed within the well is a plastic liner to protect the detector from contamination in the event
of the source leaking during measurement. The dose calibrator should always be used with the
well liner.
Source Holder
Radioactive sources are measured by placing them within the well opening of the ionization
detector using the geometry within the detector. Samples contained within vials should be held
in the bottom cup of the sample holder sample holder or syringe/vial dipper. The sample holder
places the radioactive source in the location which is at the proper measurement. Samples within
syringes should be placed in the syringe holder ring on the sample holder. Sources should be
orientated vertically in the source holder. Sources should be placed in the dose calibrator well
within 5 to 15 cm from the bottom of the detector well, as measured without the well liner in
place. The response of the dose calibrator varies +/-0.5% within this region.
Current Measurement
The ionization current is measured by a microprocessor-controlled high impedance electrometer
located within the base of the detector unit.
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