Mobile Low-Level Waste Assay System

Category: Characterization > Monitors > Radiation Monitors
Reference # : Model No :

The ORTEC ISO-CART-85 is a mobile, high-resolution gamma spectroscopy system engineered for the in-field assay of low-level radioactive waste, particularly suited for “free-release” decommissioning applications. At its core is the IDM-200-V—an integrated high-purity germanium (HPGe) detector featuring a large-area crystal and a maintenance-free Stirling cycle cryocooler, eliminating the need for liquid nitrogen. The system is mounted on the ISO-CART-II transport platform, which offers adjustable geometry, mobility, and stability. Coupled with the ISOPLUS software, the ISO-CART-85 facilitates calibrated gamma analysis across a variety of container types, soils, and surfaces, using modular collimators to adapt the field of view for varying shielding and sample characteristics.

Benefits

The ISO-CART-85 offers unmatched flexibility and convenience for non-destructive assay (NDA) in mobile or field environments. Its battery-powered, mechanically cooled HPGe detector allows long-duration, high-resolution measurements without cryogenics. The modular collimator system minimizes system weight while adapting shielding to background conditions, improving measurement precision. The ISOPLUS software provides traceable calibrations, intuitive container and soil measurement workflows, and supports both supervised and simplified operator modes. Combined, these features allow users to achieve low Minimum Detectable Activities (MDAs) in realistic count times, enabling regulatory compliance in situ—without the need for sample return or centralized laboratory analysis.

Limitations

While the ISO-CART-85 excels in field deployment, it does have limitations. The accuracy of its assay depends heavily on user-specified geometry, matrix parameters, and environmental background radiation, which can introduce modeling uncertainties if inaccurately configured. Its battery life, though extendable, may be a constraint during prolonged or multi-site operations. Furthermore, while the modular collimation system is designed to balance shielding and weight, achieving the lowest MDAs in high-background conditions may still require physically heavier configurations. Finally, although designed for ease of use, effective operation still demands trained personnel familiar with radiation measurement principles and software-driven calibration techniques.

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