Well-type detectors optimized for best counting efficiency

The Multi Crystal uses high-performance NaI well-type detectors that minimize variance effects caused by sample volume and position to guarantee best counting efficiencies. The crystals cover an energy range from 10 to 510 KeV suitable to detect e.g. 125I, 57Co, 131I, 51CR, 75Se or 99TC. A 6 mm lead shield surrounds each detector, providing 12 mm lead shielding between detectors to decrease interferences such as crosstalk between samples or background radiation.

High throughput, long service life

The 12-detector version of the system enables analysis of 204 samples in 17 minutes (1 minute counting time per sample). More than 1.300 samples/h can be measured using the 24-detector model. A complete series of measurements can be prepared in advance using multiple sample racks. As the Multi Crystal contains no moving parts, sample jamming and expensive belt repairs are never a problem.

Safe and reliable measurement

The sample rack concept of the Gamma Counter prevents contamination entering the instrument, e.g. via tubes contaminated on the outside. The tubes are placed in racks for signal measurement which can be cleaned and decontaminated easily. And, to satisfy quality management requirements, both the stand-alone version of the software as well as MikroWin support QM functions, including efficiency, absolute & relative background, relative detector efficiency and high voltage adjustment. In order to facilitate instrument QC, single-tube or 12-tube 125I or 57Co sources of 2 KBq/tube are available.

Convenient software options and LIMS connectivity

Several software options are available for measurement and data analysis:

  • The system can work in stand-alone mode, no computer needed. Just attach a keyboard, screen and printer directly to the gamma counter, and start measuring.
  • LBIS provides a Windows-based intuitive graphical user interface delivering straightforward instrument control and data analysis, and makes it easy to get started and get going. LBIS supports a wide variety of applications, such as competitive (RIA) and immunometric (IRMA) assays with superior curve fitting algorithms. Convenient import/export functionality enables to upload patient information and to download result.
  • The MikroWin software is a complete solution providing instrument control, data collection, analysis and reporting. MikroWin enables evaluation of any kind of screening assays using controls, classifications and calculation groups. Sophisticated curve fitting routines (linear or nonlinear) enable sample quantification and reliable results even at low concentrations. The Advance version of the software provides 21 CFR Part 11 compliance and additional QC features, such as configurable user hierarchies, audit trail with automated Log-file generation, automated file-name generation, control history for validation, and assay LOT-No. Verification.