福島核事故對(duì)海陽(yáng)核電廠(chǎng)本底調(diào)查的影響
發(fā)布時(shí)間:2018-04-27 06:11
本文選題:福島核事故 + 氣溶膠。 參考:《蘇州大學(xué)》2013年碩士論文
【摘要】:目的:掌握福島核事故對(duì)海陽(yáng)核電廠(chǎng)本底調(diào)查的影響。 方法:于2010年12月至2011年6月,定期采集海陽(yáng)核電廠(chǎng)周?chē)?個(gè)固定監(jiān)測(cè)點(diǎn)的氣溶膠、沉降灰和空氣131I樣品測(cè)量,連續(xù)測(cè)量5個(gè)固定監(jiān)測(cè)點(diǎn)的Y劑量率; 1.使用大流量采樣器采集氣溶膠樣品,使用中流量采樣器采集空氣131I樣品,使用水盆法采集沉降灰樣品; 2.采用Model919E HPGe多道γ能譜儀測(cè)量氣溶膠和沉降灰中134Cs、137Cs、58Co、60Co、54Mn、103Ru和110mAg及空氣中131I的放射性水平; 3.采用BH1216低本底α、β測(cè)量?jī)x測(cè)量氣溶膠和沉降灰中總α、總β和90Sr的放射性水平; 4.采用YB-Ⅳ型高壓電離室Y劑量率儀于5個(gè)固定測(cè)量點(diǎn)連續(xù)測(cè)量Y劑量率; 5.比較事故前后樣品測(cè)量的數(shù)據(jù),分析福島核事故對(duì)海陽(yáng)核電廠(chǎng)環(huán)境輻射本底調(diào)查造成的影響。 結(jié)果: 1.氣溶膠樣品中在事故后第二個(gè)月監(jiān)測(cè)到134Cs、137Cs,,其中134Cs的范圍為58.2~85.7μBq/m3,均值為74.9μBq/m3,137Cs的范圍為19.8~68.3μBq/m3,均值為46.3μBq/m3;在事故發(fā)生當(dāng)月和第二個(gè)月監(jiān)測(cè)到了90Sr,其范圍為27.6~48.6μBq/m3,均值為38.3μBq/m3;總α、總β無(wú)明顯變化;’8Co、60Co、54Mn、103Ru和110mAg均未檢出。 2.沉降灰樣品中在事故發(fā)生后137Cs的范圍為0.08~0.20Bq/(m2.M),均值為0.14±0.05Bq/(m2.M);90Sr的范圍0.05~0.11Bq/(m2.M),均值0.076Bq/(m2.M);總α、總β無(wú)明顯變化;未監(jiān)測(cè)到134Cs、58Co、60Co、54Mn、103Ru和110mAg。 3.空氣131I樣品在事故發(fā)生后,由于測(cè)量不及時(shí)未檢測(cè)出。 4.核事故發(fā)生后15天內(nèi)連續(xù)Y輻射空氣吸收劑量率,大辛家村測(cè)點(diǎn)的范圍為80.1~81.7nGy/h,均值為81.0nGy/h;寨前村測(cè)點(diǎn)的范圍為65.6~66.8nGy/h,均值為66.1nGy/h;海陽(yáng)市環(huán)保局測(cè)點(diǎn)的范圍為81.5~82.7nGy/h,均值為82.4nGy/h。 結(jié)論: 1.日本福島核事故對(duì)海陽(yáng)核電廠(chǎng)環(huán)境輻射本底調(diào)查的影響時(shí)期主要是在事故發(fā)生當(dāng)月和第二個(gè)月; 2.日本福島核事故對(duì)海陽(yáng)核電廠(chǎng)環(huán)境輻射本底調(diào)查的影響主要核素是氣溶膠134Cs和137Cs,其次是沉降灰的137Cs,再其次是氣溶膠的90Sr; 3.日本福島核事故排放的58Co、60Co、54Mn、103Ru和110mAg對(duì)海陽(yáng)核電廠(chǎng)周?chē)鸁o(wú)影響,空氣131I的放射性水平小于2.16mBq/m3。
[Abstract]:Objective: to study the effect of Fukushima nuclear accident on background investigation of Haiyang nuclear power plant. Methods: from December 2010 to June 2011, aerosols from 5 fixed monitoring sites around Haiyang Nuclear Power Plant were collected regularly, and the aerosol deposition and air 131I samples were measured, and the Y dose rates of 5 fixed monitoring points were continuously measured. 1. The aerosol samples were collected by the large flow sampler, the air 131i samples were collected by the medium flow sampler, and the settling ash samples were collected by the water basin method. 2. The radioactivity levels of 134CsO137Csl5Co60CoO60CoCX 54MnO103Ru and 110mAg and 131I in aerosol and precipitated ash were measured by Model919E HPGe multichannel 緯 -energy spectrometer. 3. The radioactivity levels of total 偽, total 尾 and 90Sr in aerosol and precipitated ash were measured by BH1216 low background 偽, 尾. 4. YB- 鈪
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