Estimation of effective dose from radon exposure based on radon and progeny concentration characteristics in radioactive mines
To elucidate the distribution of radon and its progeny concentrations as well as to assess radon exposure doses,this study employed a SCARDEQF3220 instrument to monitor radon concentrations,both attached and unattached radon progeny,alongside environmental parameters and ventilation conditions across various typical underground locales within a radioactive mine.These locales included stopes,the single-head excavation face,adit entry,and the signal station.Such comprehensive monitoring facilitated the assessment of equilibrium factors and the proportion of unattached radon progeny,enabling precise on-site measurement of core parameters essential for estimating effective radon exposure doses.Subsequent analyses,predicated on these characteristic parameters,estimated the effective radon exposure doses for these typical mine locations.These estimations took into account production requirements and prevailing ventilation conditions,guiding the formulation of a proposal aimed at enhancing mine safety.Proposed measures encompass improved ventilation to lower radon concentrations,prevention of ore pile accumulation,application of radon-resistant coatings,and mandatory mask usage as key management strategies.The findings reveal that:(1)The measurement outcomes from typical underground locations within the radioactive mine demonstrate that the equilibrium factor varies between 0.02 and 0.29,with the unattached fraction ranging from 0.034 to 0.098.(2)Furthermore,the experimental data unveil a negative correlation between the equilibrium factors and the unattached fractions of radon progeny,suggesting that an increase in the equilibrium factor is associated with a decrease in the unattached fraction of radon progeny.(3)The analysis contrasted the estimates of radon exposure doses using the dose conversion factor recommended by the International Committee on Radiological Protection(ICRP)with those derived from the calculated dose conversion factor based on the unattached fraction of radon progeny.The estimated exposure ranges for ERn1 and ERn2 in normal production areas span from 0.17 mSv to 19.70 mSv and from 0.11 mSv to 16.52 mSv,respectively.The former exceeds the latter,yet both remain below the threshold of 20 mSv.
safety and hygiene engineering technologyradonradon progenyequilibrium factorunattached fractiondose estimation
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