【摘要】 目的调查南水北调东线山东段通水前沿线主要湖区水中的放射性水平。方法总α、总β采用饱和厚度相对测量法,226Ra采用射气法,137Cs、60Co、238U、232Th、40K用高纯锗γ谱仪测量,90Sr用硫酸盐EDTA络合沉淀法。结果总α、总β活度浓度均值分别为9.69×10-2、2.82×10-1Bq·L-1;90Sr、137Cs活度浓度均值分别为5.50×10-3、7.60×10-4Bq·L-1,60Co未测出;238U、226Ra、232Th和40K的活度浓度均值分别为1.37×10-2、6.48×10-3、13.95×10-4和1.21×10-1Bq·L-1。结论流经位于微山湖东侧郗山村的河水中总α、238U的放射性水平偏高,南水北调山东段主要湖区水中的放射性总体处在本底水平。更多还原

【Abstract】 Objective To study the radioactivity levels in the main lakes of Shandong basin in east line of South to North water diversion. Methods The Gross-alpha and gross-beta activities were determined by using alpha-/beta-discrimination liquid scintillation counting (alpha-/beta-LSC) by direct measurement of the dried resin after extraction;~ 226 Ra using NIST radon emanation standards; ~ 137 KG*5/7Cs,~ 60 Co,~ 238 U,~ 232 Th,~ 40 K with gamma-ray spectrometry using a HPGe-γ detector;~ 90 Sr using general deposition by sulphate and EDTA. Results The average levels of gross-alpha、gross-beta are 9.69×10~ -2 、2.82×10~ -1 Bq·L~ -1 respectively. The average levels of ~ 90 Sr、~ 137 Cs are 5.50×10~ -3 ,7.60×10~ -4 Bq·L~ -1 respectively. There is no counts in detecting ~ 60 Co by using the HPGe-γ detector. The average levels of ~ 238 KG*5/7U,~ 226 Ra,~ 232 Th and ~ 40 K are 1.37×10~ -2 、6.48×10~ -3 、13.95×10~ -4 and 1.21×10~ -1 Bq·L~ -1 respectively. Conclusion The levels of gross-alpha and ~ 238 KG*5/7U in Chishan village are higher than the average levels in the main lakes of Shandong basin. The average radioactive levels of others in the main lakes of Shandong basin are about to the background levels.更多还原