Estimated doses related to 222Rn concentration in bunker for radiotherapy and storage of radioisotopes

It was done a survey in radiotherapy services underground hospitals and clinics of Venezuela and Paraguay in order to estimate the concentrations of radon and its possible consequences on worker occupational exposure. Passive dosimeters were used to assess nuclear traces (NTD type CR-39®). The concentration of 222Rn is determined based on the density of traces using the calibration coefficient of 1 tr/cm2 equivalent to 0,434 Bqm-3 per month of exposure. Assuming the most likely environmental conditions and the dose conversion factor equal to 9.0 x 10-6 mSv h -1 by Bqm-3, it was determined the average values and estimated the possible risks to health that are on average 3.0 mSva-1 and 150 micro risk cancer