咸宁市瓷砖内放射性水平测量研究

Measurement of Radioactivity Level in Ceramic Tile in Xianning City

为了确认咸宁市销售的瓷砖是否存在放射性超标,对咸宁市9种品牌瓷砖共27个样品进行了天然放射性核素比活度测量,采用BH1324 F型环境γ低本底谱仪,详细测量其中226Ra、232Th和40K的比活度及计算各自内、外照射指数。结果显示,所测瓷砖中226Ra、232Th和40K的比活度范围分别为:65.05-204.64Bq/kg、59.56-279.19Bq/kg、495.40-1398.87Bq/kg;内照指数为:0.42-0.93,外照指数为:0.71-0.97。对照国家相关规定,所测的瓷砖内放射性水平均在允许的限值范围内,且属A类建材,市民可以放心使用。

In order to confirm if the radioactivity of ceramic tiles in xianning city exceed the standard values,a total of 27 samples of 9different brands ceramic tiles were collected,the natural radioactivity of ^226 Ra,^232Th and ^40 K were measured as well as the internal and external exposure index were given out.The measurements were carried out using type of BH1324 low environment gamma-ray spectrometry detector system.The results show that the activity concentrations of ^226 Ra,^232Th and ^40 K is 65.05-204.64Bq/kg,59.56-279.19Bq/kg,495.40-1398.87Bq/kg,respectively.And the internal and external exposure index were less than 1.According to the national standards,all these ceramic tiles can be used without limitation.