宝鸡燃煤电厂原煤及粉煤灰中天然放射性水平

本文调查测量了宝鸡电厂原煤（3个样品）、粉煤灰（17个样品）、底灰（6个样品）中天然放射性核素^226Ra、^232Th和^40K的比活度，分析了燃煤产生的底灰和粉煤灰中上述核素的含量特征，及其与原煤相比的浓集倍数。宝鸡电厂原煤和粉煤灰样品中天然放射性核素^226Ra、^232Th和^40K的比活度水平与北京电厂和上海电厂的接近。依据国家标准（GB6566-2001），对宝鸡电厂粉煤灰用作建筑材料的可行程度进行了评价，得出当建材原料100％为粉煤灰时，约有29％的样品超过国家标准的限制值。所以，应对用作建材原料的粉煤灰作放射性检测，选用合格的部分，控制高比活度粉煤灰在建材原料中的配比，以确保达到合理使用的效果。

NATURAL RADIOACTIVITY LEVEL IN COAL AND ASH COLLECTED FROM BAOJI COAL-FIRED POWER PLANT

Specific activities of natural radionuclides ~(226)Ra, ~(232)Th and ~(40)K were assessed in coal(3 samples),fly ash(17 samples)and bottom ash(6 samples) collected from Baoji coal-fired power plant.This paper analyzed the characteristics of ~(226)Ra, ~(232)Th and ~(40)K contents in bottom ash and fly ash,and studied the concentration factors of these radionuclides in ash in relation to those in coal.The level of natural radionuclides ~(226)Ra, ~(232)Th and ~(40)K of coal collected from Baoji coal-fired power plant are in the range of radionuclides contents of Chinese coal.The natural radioactivity level of fly ash collected from Baoji coal-fired power plant is close to Beijing and Shanghai coal-fired power plants.The paper farther assessed the possibility of fly ash of Baoji coal-fired power plant used as building materials according to the state standard.The results show that there are 29% samples exceeding the state limit when fly ash used as building materials.So the usage of fly ash in building material should be controlled.