An information system for radioactivity level in aquatic environments

In this work a monitoring system, pro information relative to the radioactivity level in aquatic environments, is presented. The radioactivity information is obtained from the measured spectrum, using an algorithm for photopeak determination based on wavelet denoising methods. This algorithm improves significantly the analysis capability of a short-term spectrum with poor statistical information. The measurement data are collected by the underwater part of the system, which has built-in photomultiplier tube, preamplifier and power supply, together with the electronics for data acquisition, storage and transmission. The system can perform in-situ measurements of natural or anthropogenic radionuclides in water and can be installed on any oceanographic buoy and remotely operated or autonomous underwater vehicles. In case of an ROV/AUV installation, the system operates in a continuous monitoring and data storage mode for preliminary studies at specific aquatic areas, while use in a buoy installation is currently under development.