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34 percent of Galician secondary schools exceed maximum recommended radon levels

Researchers from the University of Santiago de Compostela (USC) have analysed levels of radon, a natural radioactive gas, in 58 secondary schools in Galicia. The results show that 34% of these schools exceed the limit of 400 Bequerels/m3 recommended by the European Union. Excessive inhalation of radon is associated with lung cancer.

"Out of all the secondary schools where samples were taken, 34% had radon levels in excess of 400 Bequerels/m3 in some of their classrooms or offices", Juan Jos Llerena, co-author of the study and a member of the USC's Radiation Analysis Laboratory, tells SINC. "In addition, 15% had some point where figures were in excess of 800 Bq/m3", warns the expert.

In order to carry out the study, which has been published recently in the Journal of Environmental Radioactivity, the team took 374 measurements using activated carbon canisters and other detectors (requiring both long and short periods of exposure) in 58 secondary schools in the four provinces of Galicia.

"Corrective measures must be put into place in Galicia as well as other regions of Spain, and the number of centres available to measure radon and extend these preventive measures and actions to nurseries and primary schools must also be increased", says another of the study's authors, Ignacio Durn, who is the group coordinator.

The European Union recommends maximum air radon levels of 400 Bq/m3 inside buildings. If this level is exceeded, actions should be taken to reduce it. This regulation applies to properties built before 1990. The recommended levels for those built after this date are 200 Bq/m3.

The World Health Organisation goes even further, and has reduced the safe limit to 100 Bq/m3, since a positive correlation has been found between the levels of this gas inside buildings and lung cancer.

Measure and correct without causing panic

The researchers' intention is not to alarm the population,

Contact: SINC
FECYT - Spanish Foundation for Science and Technology

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34 percent of Galician secondary schools exceed maximum recommended radon levels
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