Results of the national radon indoors survey in Bulgaria

Ivanova, Kremena and Stojanovska, Zdenka and Chobanova, Nina and Tsenova, Martina and Angelova, Antoaneta (2017) Results of the national radon indoors survey in Bulgaria. In: Third East-European Radon Symposium, 15-19 May 2017, Sofia,Bugarija. (Unpublished)


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Purpose: To present the results of the annual average indoor radon concentrations from National survey in Bulgarian regions. Variability of measured data between 28 regions was investigated in order to achieve the preliminary assessment the distribution of indoor radon concentration through Bulgarian territory. Argument: The National survey on average radon concentration in Bulgarian dwellings was carried out from 2015 to 2016, with the co-operation of the Regional Health Inspectorate under the National Radon Program. Data were collected through personal interviews with residents and deployment of alpha track detectors for one year through two phases. The first phase was from March 2015 to December 2015 and second from December 2015 to April 2016 approximately. For each region 100 detectors were distributed and spread to villages in regions depending on the population. The measurements were completed in 2775 dwellings. The distribution of indoor radon levels has been found to be log-normal with a geometric mean (GM) of 81.6 Bq•m−3 and a standard deviation of 2.1. The highest value of the radon concentration found was 1314 Bq•m−3 in the Sliven region. Region with high GM of 184 Bq•m−3 and a standard deviation of 1.7 is Yambol in Southeast Bulgaria. In about 6% of the houses, the radon concentration was found to be in excess of the recommended reference value of 300 Bq•m−3, suggested by the Council of the European UnionCommission in in new EU Directive 2013/59/Euratom. Conclusion: The data from National survey are the first systematic results and are received to complete the National Program, which will finish in 2017. The preliminary results clearly show that the national action plan to address long-term risks from radon exposures should be developed taking into account the results achieve in this program and in accordance with the new Directive 2013/59/Euratom.

Item Type: Conference or Workshop Item (Speech)
Subjects: Natural sciences > Physical sciences
Divisions: Faculty of Medical Science
Depositing User: Zdenka Stojanovska
Date Deposited: 20 Jun 2017 14:01
Last Modified: 20 Jun 2017 14:01

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