Radon concentrations in caves of Parque Estadual do Alto Ribeira (PETAR), SP, Brazil: preliminary results

摘要

Radon concentrations assessment in the most frequented caves of PETAR, Parque Estadual do Alto Ribeira (High Ribeira River Turistic State Park), created in 1958 and situated south of Sao Paulo State, Brazil are carried out with Makrofol E nuclear track detectors, installed in the most frequently visited caves. Preliminary results from October 2003 to July 2004 show radon concentrations varying from 512+-86 to 6607+-179 Bq m~(-3). The complete assessment will be achieved by March 2005.