Of all the 28 dwellings surveyed, 6 dwellings (21%) have indoor radon levels above 200 Bq/m~3, a limit value of indoor radon laid down by China Environmental Protection Agency.

• 在进行调查的28个居室中,有6个(占21%25)居室内氡浓度超过我国住房内氡浓度控制标准GB/T16146-1995中已建住房的室内氡浓度上限值(200Bq/m3)和国际辐射防护委员会制定的200Bq/m3的上限值。