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APPENDIX C:
Atomlab 500 Dose Calibrator Specifications
Overview
This Appendix provides the physical and operating specifications of your Atomlab 500 Dose
Calibrator.
Measurement Range
For Tc-99m, 0.01 µCi to 100 curies, auto-ranging or 25 curies of F-18.
Display Ranges
Units are user selectable:
ci bq
00.00-1999 µCi 00.00-19.99 MBq
2.00-19.99 mCi 20.0-199.9 MBq
20.0-199.9 mCi 200-1999. MBq
200-9999 mCi 2.00-399.9 GBq
10.00-100.00 Ci 400.0-3700.0 GBq
Response Time
Auto Selection: Display updates once per second.
1-2 seconds >200 microcuries Tc
3 seconds >20 microcuries Tc
50-100 seconds <20 microcuries Tc
NOTE: Response time for activity of less than 20 microcuries can be decreased by reducing the
measurement threshold. Reducing the measurement threshold decreases response time at the
cost of higher fluctuation.
NOTE: All activities listed in specifications are for Tc-99m; for the specifications concerning
other isotopes, please convert to Tc-99m equivalent. The Tc-99m equivalent of an isotope can be
found by multiplying the source activity by the Tc-99m dial value, then dividing by the
isotope dial value. The Tc-99m equivalent is the activity of a Tc-99m source which would
produce the same current as the isotope source when placed in the well detector.
Accuracy
Overall accuracy of activity determination for isotopes Co-57, Co-60, Ga-67,
Tc-99m, In-111, i-131, Ba-133, Cs-137, and TI-201, using the factory set
calibration values are within 3% or 0.3 microcuries, whichever is greater.
NOTE: Intercomparison of calibrated sources and the Atomlab 500 requires combining the
uncertainties of both the Atomlab 500 and the calibrated source to determine expected
agreement.
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