Kunovska Bistra, Ivanova Kremena, Badulin Victor, Cenova Martina, Angelova Antoaneta
National Centre of Radiobiology and Radiation Protection, 3 Sv.Georgi Sofiiski St, Sofia, Bulgaria.
Bulgarian Nuclear Regulatory Agency, 69 Shipchenski Prohod St., Sofia, Bulgaria.
Radiat Prot Dosimetry. 2018 Sep 1;181(1):34-37. doi: 10.1093/rpd/ncy098.
In the light of the new ICRP requirements the first National radon survey has been conducted in Bulgaria in the period 2015-16. Indoor radon concentrations were measured for 1 y in 2778 dwellings of whole Bulgarian territory in order to obtain the systematic data for the distribution of radon. The arithmetic mean is 111 Bq m-3 and the geometric mean is 81 Bq m-3 with geometric standard deviation of 2.15. On the base of the data, an annual effective dose to the Bulgarian population due to indoor radon exposure was estimated at 5.2 mSv and excess lifetime cancer risk at about 2%. The evaluation has been made using the ICRP dose coefficient of 6.7 × 10-6 (mSv h-1)/(Bq m-3), 7000 h occupancy per year and value of 0.4 for the equilibrium factor. This preliminary assessment allows consideration and planning the long-term appropriate radon and exposure reduction measures in the new national action plan.
根据国际辐射防护委员会（ICRP）的新要求，保加利亚于2015 - 16年期间开展了首次全国氡气调查。为获取氡气分布的系统数据，在保加利亚全国范围内的2778处住宅中进行了为期1年的室内氡浓度测量。算术平均值为111 Bq m-3，几何平均值为81 Bq m-3，几何标准偏差为2.15。根据这些数据，估计保加利亚人口因室内氡暴露的年有效剂量为5.2 mSv，终生患癌超额风险约为2%。评估采用了ICRP的剂量系数6.7×10-6（mSv h-1）/（Bq m-3）、每年7000小时的居住时间以及平衡因子0.4的值。这一初步评估有助于在新的国家行动计划中考虑并规划长期适当的氡气及降低暴露措施。
