Uranium, radium and tritium groundwater monitoring at INFN-Gran Sasso National Laboratory, Italy

Abstract

Uranium groundwater anomalies, which were observed in cataclastic rocks crossing the underground Gran Sasso National Laboratory before the L’Aquila earthquake (April 6th, 2009), have been studied versus radium and tritium contents. The radionuclide analysis supports the role of endogenic fluid dynamics for uranium content in groundwater rather than percolation processes, due to meteoric events occurring above the water table of the Gran Sasso aquifer. The uranium anomalies represent a key geochemical signal of a progressive increase of deep fluids fluxes at middle-lower crustal levels associated with the geodynamics of the earthquake. Moreover, the uranium represents a more precise strain-meter than radon as its presence can be modulated during the preparation phase of the earthquake, and only successively released by micro- fracturing during the main shock and aftershocks

Low-level 226Ra determination in groundwater by SF-ICP-MS: optimization of separation and pre-concentration methods

“…The aim of the present work has been to develop a robust technique for the 226 Ra analysis of groundwater samples collected from the Gran Sasso (GS) aquifer (central Italy) (Plastino et al 2013). Within the framework of the Environmental Radioactivity Monitoring for Earth Sciences (ERMES) project carried out at the Instituto Nazionale di Fisica Nucleare (INFN) Gran Sasso National Laboratory, 1-L groundwater samples have been collected weekly since 2008 at ten different sites located in the underground laboratory (Plastino et al 2010;Plastino et al 2011).…”