Dose Calibrator for Hot Cell Quality Assurance of Radiopharmaceuticals

The Dose Calibrator for Quality Assurance is specifically designed to support the comprehensive quality testing required for radiopharmaceuticals before patient administration. Beyond simple activity measurement, this instrument performs automated decay correction, percent purity calculation, and comparison against expected values. The software includes protocols for common QA tests including generator eluate breakthrough measurement (alumina breakthrough), radiochemical purity assessment (using the calibrator as a counter for chromatography strips), and radionuclidic identity verification. All results are stored in a searchable database with complete chain-of-custody records. The detector installs inside the hot cell for direct measurement of samples without transfer.

This dose calibrator is designed for nuclear medicine departments that perform radiopharmaceutical quality assurance in accordance with USP, European Pharmacopoeia, or other regulatory standards. Specific QA applications include measuring Tc-99m generator eluate for molybdenum breakthrough (must be <0.15 μCi Mo-99 per mCi Tc-99m), assessing radiochemical purity of Tc-99m-labeled compounds (must exceed 90% for most agents), verifying radionuclidic identity for multidose vials, testing for aluminum ion concentration in generator eluate (must be <10 μg/mL), and measuring pH of radiopharmaceutical preparations. The instrument also supports routine quality control for F-18 FDG, including measurement of radiochemical purity and residual solvent analysis when used with specialized accessories.

The Dose Calibrator for Quality Assurance achieves measurement accuracy of ±5% for standard activity measurements and provides specialized capabilities for QA testing. For molybdenum breakthrough measurement in Tc-99m eluates, the instrument uses a two-step protocol: first measure the eluate with no shielding (measures combined Tc-99m and Mo-99 activity), then measure again with a 4 mm lead shield that attenuates Tc-99m photons but passes Mo-99 photons. The software automatically calculates the breakthrough ratio and compares it to the regulatory limit, producing a pass/fail result. The measurement sensitivity for Mo-99 is 0.01 μCi, well below the regulatory threshold. For radiochemical purity assessment, the instrument includes a chromatography strip holder that positions the strip at the optimal geometry for counting. The user spots the strip, develops it, cuts it into segments, and measures each segment in the calibrator. The software calculates the percent activity in each segment and compares it to acceptance criteria. The same holder can be used for thin-layer chromatography (TLC) and instant thin-layer chromatography (ITLC) strips. For radionuclidic identity verification, the instrument uses energy discrimination (for instruments with multichannel analyzer capability) or half-life measurement (for standard instruments). The user measures the sample at two different times, and the software calculates the observed half-life and compares it to the expected half-life for the claimed radionuclide. The instrument includes a comprehensive quality control database that stores results for all tests with full traceability. For each lot of radiopharmaceutical, the database maintains records of eluate breakthrough, radiochemical purity, pH, and aluminum concentration. The system alerts users when test results approach or exceed acceptance limits and provides graphical trends over time to identify developing problems with generators or labeling procedures. All QA records can be printed or exported for regulatory inspection. For nuclear medicine departments, the primary benefit is simplified regulatory compliance: the instrument automates complex QA calculations, enforces standard protocols, and maintains complete documentation. The ability to perform QA testing inside the hot cell reduces exposure and contamination risk compared to testing at an external bench. For quality assurance managers, the database of historical results enables trend analysis that can identify problems before they lead to patient dose failures. The Dose Calibrator for Quality Assurance transforms what is often a tedious, error-prone manual process into an efficient, automated workflow.