Abstract: One of the aims of the First Intercomparison on Natural Radioactivity Under Field Conditions was to test different instruments and detectors for the measurement of radon gas and external gamma radiation (dose rate) in filed conditions, where the levels of natural radiation are quite high. The event was organized by the Radon group of University of Cantabria, (Spain) LaRUC, and was held in the end of May 2011, in the area of an old uranium mine of ENUSA, near Saelices el Chico (Salamanca, Spain). The following activities were performed: External gamma dose rate; Radon indoors with active and passive detectors; Radon outdoors; Radon in water; Radon exhalation rate from building materials; Radon exhalation rate from soil and Radon in soil gas. This work presents the main results of the intercomparison obtained by our group in all the exercises.

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