статья в журнале

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ENVIRONMENTAL MONITORING AND ASSESSMENT

ISSN:01676369

2021

10.1007/s10661-021-09337-y

This paper provides a new approach that simplifies the monitoring of Pb-214 activity concentration on aerosols in the atmospheric surface layer. The approach allows obtaining data on Pb-214 activity concentration with the discreteness of 2 h. The experimental setup described in the paper made it possible to achieve a minimum detectable activity level of 0.4 Bq m(-3). Using this approach, the data on the diurnal variability of Pb-214 activity concentration in the atmosphere of Sevastopol city for a period of 18 months were obtained. The Pb-214 activity concentration varied from < 0.4 (less than 1% of the data series) to 8.9 Bq m(-3), mean value 2.0 +/- 1.0 Bq m(-3). The analysis of the temporal variability of Pb-214 activity concentration on different time scales (diurnal, seasonal) was carried out. Annually averaged diurnal variation curve of Pb-214 activity concentration showed a peak at 6:00 local time and a minimum at 18:00. The maximum variability in the seasonal averaged diurnal cycle of Pb-214 activity concentration is observed in summer (+/- 30% of the daily average value) and the minimum in winter (+/- 13%). The maximum seasonal average value of Pb-214 activity concentration is observed in winter (2.5 Bq m(-3)) and the minimum in summer (1.4 Bq m(-3)). A quantitative estimate of the annual effective dose due to exposure to outdoor radon was obtained by using Pb-214 data, and it was 0.03 mSv a(-1).

Lead-214 (Pb-214)Online monitoringDiurnal cycleSeasonal variabilitygamma-ray spectroscopyEffective dose

2021-09-25 10:38:35