【摘要】 应用γ能谱测定了西安市蜂窝煤中天然放射性核素226Ra2、32Th和40K的含量,并初步分析了取暖期蜂窝煤燃烧对室内氡及钍射气浓度的贡献,以及所致居民剂量.结果表明,西安地区蜂窝煤的天然放射性核素226Ra含量在31.8~109.7 Bq/kg,平均69.8 Bq/kg;232Th含量12.9~89.6Bq/kg,平均37.3 Bq/kg;40K含量232.2~583.4 Bq/kg,平均363.9 Bq/kg.蜂窝煤燃烧1 h对室内氡贡献为0.98 Bq/m3,对室内钍射气贡献为0.53 Bq/m3.燃煤释放氡所致男性和女性居民的剂量当量分别为15.91和13.98μSv.燃煤释放钍及子体所致男性和女性居民的剂量当量分别为0.29和0.25μSv.西安市冬季蜂窝煤取暖不会对居民构成辐射危害.更多还原

【Abstract】 Gamma ray spectrometry was used to measure the activity concentrations of ²²⁶Ra,²³²Th and ⁴⁰K in honeycomb briquette.The contents of ²²⁶Ra and ²³²Th of honeycomb briquette were used to calculate the contribution of honeycomb briquette burning to indoor radon and thoron and their radiation dose to the residents.The analysis show that the concentration of ²²⁶Ra,²³²Th and ⁴⁰K of honeycomb briquette collected from Xi′an ranges from 31.8 to 109.7 Bq/kg,12.9 to 89.6 Bq/kg,and 232.2 to 583.4 Bq/kg,with the mean value of 69.8,37.3 and 363.9 Bq/kg respectively.The contribution of honeycomb briquette burning to indoor radon and thoron is 0.98 and 0.53 Bq/m³.The equivalent dose to male and female residents of indoor radon from honeycomb briquette is 15.91 and 13.98 μSv.The equivalent dose to male and female residents of thoron from honeycomb briquette is 0.29 and 0.25 μSv.Honeycomb briquette burning can not cause harmful radioactive effects on residents in Xi′an.更多还原