活性炭吸附-液閃法測量建材氡析出率的研究
發(fā)布時間:2019-04-19 02:16
【摘要】:為實現(xiàn)建材樣品氡析出率的自動化測量,本文研究了一種活性炭吸附-液閃測量建材氡析出率的方法,并通過比較活性炭吸附-液閃法與活性炭吸附-γ能譜法在氡析出率標(biāo)準(zhǔn)裝置、鈾礦砂水泥磚及發(fā)泡磚表面測量值之間的差異,驗證該方法的準(zhǔn)確性。測量結(jié)果表明:活性炭吸附-液閃法可在一定條件下忽略反擴散的影響;根據(jù)制備的C-LS-Rn標(biāo)準(zhǔn)源可得其刻度系數(shù)為72.36min~(-1)·Bq~(-1),對氡的計數(shù)效率為120%;累積時間為72h的最小可探測氡析出率為8.15×10~(-4) Bq/(m~2·s);該方法與活性炭吸附-γ能譜法測量結(jié)果的相對偏差為10%左右,在可接受范圍內(nèi)。
[Abstract]:In order to realize automatic measurement of radon exhalation rate of building material samples, a method of measuring radon exhalation rate of building materials by activated carbon adsorption-liquid scintillation is studied in this paper. The accuracy of this method is verified by comparing the difference between activated carbon adsorption-liquid flash method and activated carbon adsorption-緯 spectrometry in radon exhalation rate standard device, uranium ore sand cement brick and foaming brick surface measurement. The measurement results show that the influence of anti-diffusion can be ignored by activated carbon adsorption-liquid flash method under certain conditions. The calibration coefficient of the prepared C-LS-Rn standard source is 72.36 min ~ (- 1) Bq~ (- 1), and the efficiency of radon counting is 120%. The minimum detectable radon exhalation rate of 72 h is 8.15 脳 10 ~ (- 4) Bq/ (m2 路s);). The relative deviation between this method and that of activated carbon adsorption-緯 spectrometry is about 10%, which is within acceptable range.
【作者單位】: 南華大學(xué)核科學(xué)技術(shù)學(xué)院;
【基金】:國家自然科學(xué)基金資助項目(11275094) 中國科學(xué)院戰(zhàn)略性先導(dǎo)科技專項資金資助項目(XDA10010500)
【分類號】:X837
[Abstract]:In order to realize automatic measurement of radon exhalation rate of building material samples, a method of measuring radon exhalation rate of building materials by activated carbon adsorption-liquid scintillation is studied in this paper. The accuracy of this method is verified by comparing the difference between activated carbon adsorption-liquid flash method and activated carbon adsorption-緯 spectrometry in radon exhalation rate standard device, uranium ore sand cement brick and foaming brick surface measurement. The measurement results show that the influence of anti-diffusion can be ignored by activated carbon adsorption-liquid flash method under certain conditions. The calibration coefficient of the prepared C-LS-Rn standard source is 72.36 min ~ (- 1) Bq~ (- 1), and the efficiency of radon counting is 120%. The minimum detectable radon exhalation rate of 72 h is 8.15 脳 10 ~ (- 4) Bq/ (m2 路s);). The relative deviation between this method and that of activated carbon adsorption-緯 spectrometry is about 10%, which is within acceptable range.
【作者單位】: 南華大學(xué)核科學(xué)技術(shù)學(xué)院;
【基金】:國家自然科學(xué)基金資助項目(11275094) 中國科學(xué)院戰(zhàn)略性先導(dǎo)科技專項資金資助項目(XDA10010500)
【分類號】:X837
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