LIVRA has designed, built, and provides gamma spectrometry monitors for paper-filter measurements. This is patented equipment capable of performing high-performance real-time measurements, with integration times ranging from 10 minutes to 5 days.
The equipment consists of a detector core with a scintillation crystal, typically LaBr₃(Ce) or SrI₂(Eu), placed inside a high-efficiency shield. The aspirated air is circulated through a paper filter on which particles or aerosols are deposited, and these are continuously and automatically measured by the gamma-spectrometry detector.
The equipment operates fully autonomously and unattended: it automatically performs scheduled filter changes, acquires spectrometric data, transmits them, and processes them continuously 24/7 without any intervention. The system has been designed to be highly robust, requiring minimal and infrequent maintenance.
The devices are equipped with battery systems to handle potential power outages. Data transmission is carried out through various communication systems (fiber optic, 5G, satellite communication, etc.).
Using our analysis systems, the minimum detectable activity concentrations (MDAC) for Cs-137 are up to the following values, assuming a constant concentration throughout the measurement period:
| LaBr3 (2x2) | SrI2 (2x2) | ||
| With 5-day measurements | 0.002 Bq/m3 ( 2.0 mBq/m3) | 0.0008 Bq/m3 (0.8 mBq/m3) | |
| With 60 h measurements | 0.00015 Bq/m3 (0.15 mBq/m3) | 0.00006 Bq/m3 (60 µBq/m3) | |
| With 24 h measurements | 0.0002 Bq/m3 (0.2 mBq/m3) | 0.0001 Bq/m3 (0.1 mBq/m3 |
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Technical specifications of the Paper-filter aerosol measurement equipment |
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This week we are participating in the International Conference on Nuclear and Radiological Emergencies (EPR2025, 1-4 December 2025, Riyadh, Saudi Arabia)