Determination of the Re-188 Calibration Number for the Capintec CRC- 25PET Dose Calibrator
Mitchell Ashley Klenner1,2, Aron Poole1,2
1Radiopharmacy Laboratory, The Kinghorn Cancer Centre, 370 Victoria St, Darlinghurst, NSW 2010, Australia.
Background:
During the development of novel Re-188 radiopharmaceuticals, it was discovered that no calibration settings were published to calibrate Re-188 on the Capintec CRC-25PET dose calibrator.
Methods:
Sodium [188Re]perrhenate was eluted from an OncoBeta 188W/188Re generator to measure activity on a Capintec CRC-25R dose calibrator using established dose calibrator settings provided by the manufacturer. The eluent was then used to tune the calibra on settings on a Capintec CRC-25PET dose calibrator, accounting for geometry. Radionuclidic purity of the [188Re]perrhenate source was verified via gamma spectroscopy.
Results:
The calibrator number for Re-188 was determined to be 469 x 10 for the Capintec CRC-25PET dose calibrator, which differed from the manufacturer provided calibra on number of 496 x 10 for the Capintec CRC-25R dose calibra on model. W-188 breakthrough was characterised as < 0.01%.
Conclusion:
This previously unreported calibration number can be used to determine the activity of Re- 188 labelled radiopharmaceuticals using the Capintec CRC-25PET dose calibrator model.
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