摘要
本文主要报道１９９３年２－１２月间对北京市５个燃煤电厂的燃煤、粉煤灰和北京加气混凝土厂生产的粉煤灰砖、加气混凝土块样品中（２２６）Ｒａ、（２３２）Ｔｈ、（４０）Ｋ含量进行调查的方法和结果。共采集燃煤样品５５个，粉煤灰样品２６个，粉煤灰砖和加气混凝土块样品各８个。测量采用ＦＨ－１９３６型低本底γ谱仪。测量结果：（２２６）Ｒａ、（２３２）Ｔｈ、（４０）Ｋ含量平均值，煤中分别为２８．９、３５．９、８０．４Ｂｑ／ｋｇ；粉煤灰中分别为１０１、１１０、３４７Ｂｑ／ｋｇ；粉煤灰砖样品中分别为４７．６、７２．９、２８８Ｂｑ／ｋｇ；加气混凝土块样品中分别为４７．８、７０．１、２１６Ｂｑ／ｋｇ。还对北京市加气混凝土厂３种不同类型的粉煤灰建材砌成的职工宿舍楼室内γ辐射剂量率进行了调查测量，８个测点测量值的范围为（６７．４—８４．７）ｎＧｙ／ｈ，３类房间的室内平均值为７８．２ｎＧｙ／ｈ，与北京市砖平房和砖混楼房的室内均值相比很接近，属正常值范围。调查结果表明，北京市粉煤灰作为建材原料，如能合理控制使用，不会造成室内γ辐射剂量率的显著增高。
This paper reports the methods and results of survey on content of (226)Ra,(232)Thand (40)K in samples of coal, ash from 5 coal-fired power plants in Beijing and ash bricks, airadded concrete from Beijing air-added concrete plant from February to December, 1993. 55coal Samples, 26 ash Samples, 8 ash brick samples and 8 air-added concrete samples werecollected. These samples were analysed by type FH-1936 low background γ-spectromenter.The average value of (226)Ra,(232)Th and (40)K of coal is 28. 9,35. 9 and 80. 4 Bq/kg, respectively; 101, 110 and 347 Bq/kg,for ash;47. 6,72. 9 and 288 Bq/kg, for ash brick and 47. 8,70. 1 and 216 Bq/kg for air-added concrete, respectively. In addition,γ radiation dose rateinside buildings of workers,dwelling houses of the Beijing air-added concrete plant made ofash building materiars were investigated and analysed. The range and the average value of 8measurement values is (67. 4─84. 7) nGy/h and 78. 2 nGy/h, respectively. It is approach tothe average value inside bungalow of bricks and a building of two or more storeys made ofbricks and concrete in Beijing and within normal range. The results show that it might notcause obviously increase of γ radiation dose rate inside buildings when the ash were rationallyused as the raw materials of building.
出处
《辐射防护》
CAS
CSCD
北大核心
1996年第4期309-316,共8页
Radiation Protection
关键词
煤
粉煤灰
建材
天然放射性
Coal,
Ash
Building Material
Natural Radioactivity
Content
Measurement
