發(fā)布時間：2018-08-05 17:03

【摘要】：根據(jù)g衰變綱圖,研究將g射線強度的測量問題轉(zhuǎn)化為表面a射線的強度測量問題,從而實現(xiàn)建材的快速無損檢測。進(jìn)行了各類建材表面a、b輻射水平和其天然放射性核素g比活度關(guān)系的研究和不同飾材表面b輻射水平的飽和厚度研究。結(jié)果發(fā)現(xiàn):由于天然放射系中最大能量b粒子的射程大于單塊飾材,不能用表面b輻射水平進(jìn)行無損檢測判斷;花崗石的表面a輻射水平與外照射指數(shù)的擬合關(guān)系為:Ig= 0.38+49.84a+288.24a2,擬合曲線和實測值的符合率為95%;拋光磚的表面a輻射水平與外照射指數(shù)的擬合關(guān)系為:Ig=0.42+343.55a 32999.66a2,擬合曲線和實測值的符合率為90%。積累更多的數(shù)據(jù)將進(jìn)一步提
[Abstract]:According to the g decay diagram, the measurement of g ray intensity is transformed into the surface a ray intensity measurement, so that the fast nondestructive testing of building materials can be realized. The relationship between the radiation level of aqb and the g specific activity of natural radionuclides and the saturation thickness of the b radiation level on the surface of various kinds of building materials were studied The results show that because the range of the largest energy b particle in the natural radiation system is larger than that of the single piece of material, the surface b radiation level cannot be used for nondestructive testing. The fitting relation between the surface a radiation level of granite and the external radiation index is: 1: IgR = 0.38 49.84a 288.24a2, the coincidence rate between the fitting curve and the measured value is 95, and the fitting relation between the surface a radiation level of polished tiles and the external radiation index is 0.42 343.55a 32999.66a2, the fitting curve of the curve is: 0.42 343.55a, 32999.66a2 The coincidence rate between the line and the measured value is 90. Accumulating more data will be further improved
【作者單位】： 四川省放射衛(wèi)生防護(hù)所 四川大學(xué)物理系輻射物理及技術(shù)教育部重點實驗室 四川省放射衛(wèi)生防護(hù)所
【基金】：四川省青年科技基金資助項目(03ZQ026-034)
【分類號】：TU564

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