Dose Calibrator with Slim Probe for Hot Cell Syringe Measurement

Dose Calibrator with Slim Probe for Hot Cell Syringe Measurement

Product Introduction

The Dose Calibrator with Slim Probe addresses a specific but critical need in hot cell operations: accurate measurement of pre-filled syringes. Standard dose calibrators are designed for vials and often produce inaccurate readings for syringe geometries because the radioactive material is concentrated in a small volume at the tip rather than distributed throughout the chamber. This instrument features a thin, elongated ionization chamber that accepts standard 1 mL, 3 mL, 5 mL, and 10 mL syringes directly. The slim probe measures just 25 mm in diameter, allowing it to pass through typical hot cell manipulator ports and position syringes correctly for optimal geometry. The detector installs permanently inside the hot cell, with the control unit and display outside for safe remote operation.

Application Range

This dose calibrator is specifically optimized for nuclear medicine departments that prepare patient-specific doses in syringes. Primary applications include measuring F-18 FDG doses for PET/CT, quantifying Tc-99m-labeled compounds (MDP, sestamibi, MAG3, etc.) for SPECT studies, verifying I-131 solution doses for thyroid therapy, and measuring Lu-177 doses for PRRT treatments. The slim probe design is particularly valuable for hot cells with restricted interior space, where a standard vial-style chamber would be difficult to position. The instrument also supports syringe-based quality control procedures, such as measuring residual activity in empty syringes after patient administration and verifying fill volumes during automated dose dispensing. In research hot cells, the slim probe accommodates specialized syringe geometries used for radiolabeling studies and novel tracer development.

Performance and Benefits

The Slim Probe Dose Calibrator achieves geometry-specific accuracy of ±5% for syringe measurements — a significant improvement over standard calibrators, which can produce errors of 20% or more when measuring syringes using vial calibration factors. The ionization chamber is positioned so that the syringe tip (where most of the activity resides) sits at the chamber's center of sensitivity, ensuring consistent readings regardless of syringe fill volume. The instrument includes factory-set calibration factors for syringe geometries of all common medical isotopes, and users can easily adjust for different syringe brands or models. The slim probe's small diameter reduces its intrusion into the hot cell workspace, leaving more room for other equipment, manipulators, and stock vials. The remote display unit, positioned outside the hot cell, shows the measured activity in large, easy-to-read digits. A built-in geometry selection menu allows the user to choose the specific syringe type and isotope combination, and the instrument automatically applies the correct calibration. The response time is under 5 seconds for most isotopes, enabling rapid measurement of multiple doses during busy preparation periods. The calibrator includes auto-ranging capability covering activities from 0.1 μCi to 5 Ci, and a background subtraction function compensates for residual activity in the hot cell environment. For quality assurance, the instrument performs daily constancy checks using a long-lived check source and provides alerts when calibration verification is due. The data logging system stores up to 500 syringe measurements with complete metadata — isotope, activity, syringe type, user ID, timestamp — for regulatory compliance and dose tracking. The USB port allows export to laboratory information systems. For nuclear medicine departments, the key benefits are improved dose accuracy for syringe-based administration (which is how most radiopharmaceuticals are given), reduced measurement variability between different technologists, and simplified workflow because syringe measurements no longer require transfer to vials. The slim probe design also reduces hand exposure because the syringe never needs to be removed from its protective shield for measurement — the entire shielded syringe inserts directly into the chamber. This combination of accuracy, safety, and convenience makes the Slim Probe Dose Calibrator an essential tool for any hot cell that prepares patient-specific syringes.