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<strong>土壤中氡濃度及土壤表面氡析出率測定</strong> </p> <p style="color:#333333;font-family:"font-size:16px;background-color:#FFFFFF;"> <strong>土壤中氡濃度及土壤表面氡析出率測定</strong> </p> <p style="color:#333333;font-family:"font-size:16px;background-color:#FFFFFF;"> <strong><img src="https://cos3.solepic.com/20200914/b_4170889202009141541378393.jpg" /><img src="https://cos3.solepic.com/20200914/b_4170889202009141541351622.jpg" /><img src="https://cos3.solepic.com/20200914/b_4170889202009141541344635.jpg" /><img src="https://cos3.solepic.com/20200914/b_4170889202009141541321377.jpg" /><img src="https://cos3.solepic.com/20200914/b_4170889202009141541403181.jpg" /><img src="https://cos3.solepic.com/20200914/b_4170889202009141541381867.jpg" /></strong> </p> <strong> <p> <strong>D.1 土壤中氡濃度測定</strong> </p> <p> D.1.1 一般原則:土壤中氡濃度測量的關(guān)鍵是如何采集土壤中的空氣。土壤中氡氣的濃度一般大于數百Bq/m3，這樣高的氡濃度的測量可以采用<strong>電離室法、</strong>靜電收集法、閃爍瓶法、金硅面壘型探測器等方法進(jìn)行測量。 </p> <p> <strong>D.1.2 測試儀器性能指標要求:</strong> </p> <p> 工作條件:溫度-10～40℃ </p> <p> 相對濕度≤90%; </p> <p> 不確定度≤20%; </p> <p> 探測下限≤400Bq/m3。 </p> <p> D.1.3 測量區域范圍應與工程地質(zhì)勘察范圍相同。 </p> <p> D.1.4 在工程地質(zhì)勘察范圍內布點(diǎn)時(shí)，應以間距10m 作網(wǎng)格，各網(wǎng)格點(diǎn)即為測試點(diǎn) (當遇較大石塊時(shí)，可偏離±2m)，但布點(diǎn)數不應少于16 個(gè)。布點(diǎn)位置應覆蓋基礎工程范圍。 </p> <p> D.1.5 在每個(gè)測試點(diǎn)，應采用鋼釬打孔?？椎闹睆揭藶?0～40mm，孔的深度宜為600～800mm。 </p> <p> D.1.6 成孔后，應使用頭部有氣孔的特制的取樣器，插入打好的孔中，取樣器在靠近地表處應進(jìn)行密閉，避免大氣滲入孔中，然后進(jìn)行抽氣。正式現場(chǎng)取樣測試前，應通過(guò)一系列不同抽氣次數的實(shí)驗，確定******抽氣次數。 </p> <p> D.1.7 所采集土壤間隙中的空氣樣品，宜采用靜電擴散法、電離室法或閃爍瓶法、金硅面壘型探測器等測定現場(chǎng)土壤氡濃度。 </p> <p> D.1.8 取樣測試時(shí)間宜在8:00～18:00 之間，現場(chǎng)取樣測試工作不應在雨天進(jìn)行，如遇雨天，應在雨后24h 后進(jìn)行。 </p> <p> D.19 現場(chǎng)測試應有記錄，記錄內容包括:測試點(diǎn)布設圖，成孔點(diǎn)土壤類(lèi)別，現場(chǎng)地表狀況描述，測試前24h 以?xún)裙こ痰攸c(diǎn)的氣象狀況等。 </p> <p> D.1.10 地表土壤氡濃度測試報告的內容應包括:取樣測試過(guò)程描述、測試方法、土壤氡濃度測試結果等。 </p> <p> D.2 土壤表面氡析出率測定 </p> <p> D.2.1 儀器設備。 </p> <p> 土壤表面氡析出率測量所須儀器設備包括取樣設備、測量設備。取樣設備的形狀為盆狀，工作原理分為被動(dòng)收集型和主動(dòng)抽氣采集型兩種?，F場(chǎng)測量設備須滿(mǎn)足以下工作條件要求： </p> <p> 溫度：-10~40℃; </p> <p> 相對濕度：≤90%; </p> <p> 不確定度：≤20%; </p> <p> 探測下限：≤0.01Bq/m2.S 。 </p> <p> D.2.2 測量步驟。 </p> <p> 按照“D.1 土壤中氡濃度測定”的要求，首先在建筑場(chǎng)地按20m×20m網(wǎng)格布點(diǎn)，網(wǎng)格點(diǎn)交叉處進(jìn)行土壤氡析出率測量。 </p> <p> 測量時(shí)，須清掃采樣點(diǎn)地面，去除腐殖質(zhì)、雜草及石塊，把取樣器扣在平整后的地面上，并用泥土對取樣器周?chē)M(jìn)行密封，防止漏氣，準備就緒后，開(kāi)始測量并開(kāi)始計時(shí)(t)。 </p> <p> 土壤表面氡析出率測量過(guò)程中，應注意控制下列幾個(gè)環(huán)節： </p> <p> 1 使用聚集罩時(shí)，罩口與介質(zhì)表面的接縫處應當封堵，避免罩內氡向外擴散(一般情況下，可在罩沿周邊培一圈泥土，即可滿(mǎn)足要求)。對于從罩內抽取空氣測量的儀器類(lèi)型來(lái)說(shuō)，必須更加注意。 </p> <p> 2 被測介質(zhì)表面應平整，保證各個(gè)測量點(diǎn)過(guò)程中罩內空間的體積不出現明顯變化。 </p> <p> 3 測量的聚集時(shí)間等參數應與儀器測量靈敏度相適應，以保證足夠的測量準確度。 </p> <p> 4 測量應在無(wú)風(fēng)或微風(fēng)條件下進(jìn)行。 </p> <p> D.2.3 結果計算(使用聚集罩情況)。 </p> <p> 用下述公式求被測地面的氡析出率： </p> <p> (D.2.3)式中 R——土壤表面氡析出率(Bq/m2.s); </p> <p> Nt——t時(shí)刻測得的罩內氡濃度(Bq/m3); </p> <p> V——聚集罩所罩信的介質(zhì)表面的面積(m2); </p> <p> t——測量經(jīng)歷的時(shí)間(s) </p> <p> D.3 城市區域性土壤氡水平調查方法 </p> <p> D.3.1 測點(diǎn)布置 </p> <p> 在城市區域按2km×1km網(wǎng)格布置測點(diǎn)，部分中小城市可以按1km×1km網(wǎng)格布置測點(diǎn)。因地形、建筑等原因測點(diǎn)位置可以偏移，但不超過(guò)200m。 </p> <p> 每個(gè)城市測點(diǎn)數量在100個(gè)左右。 </p> <p> 盡量使用1：5萬(wàn)~1：10萬(wàn)(或更大比例尺)地形(地質(zhì))圖和全球衛星定位儀(GPS)，確定測點(diǎn)位置并在圖上標注。 </p> <p> D.3.2 調查方法 </p> <p> 調查前應制訂方案，準備好測量?jì)x器和其他工具。儀器在使用前必須進(jìn)行標定，如使用兩臺或兩臺以上儀器進(jìn)行調查，所用儀器同時(shí)進(jìn)行標定，以保證儀器量值的一致性。 </p> <p> 測點(diǎn)定位：調查測點(diǎn)位置用GPS定位，同時(shí)對地理位置進(jìn)行簡(jiǎn)要描述。 </p> <p> 測量深度：調查打孔深度統一定為500~800m，孔徑20~40mm。 </p> <p> 測量次數：每一測點(diǎn)應重復測量3次，以算術(shù)平均值作為該點(diǎn)氡濃度。(或每一測點(diǎn)在3m2范圍內打三個(gè)孔，每孔測一次求平均值)。 </p> <p> 其他測量要求(如天氣)和測量過(guò)程中需要記錄的事項按本附錄D.1執行。 </p> <p> D.3.3 調查的質(zhì)量保證。 </p> <p> 儀器使用前應按儀器說(shuō)明書(shū)檢查儀器穩定性(如測量標準α源、電路自檢等方法)。 </p> <p> 使用兩臺以上的儀器工作時(shí)應檢查儀器的一致性，一般兩臺儀器測量結果的相對標準偏差應小于25%。 </p> <p> 應挑選10%左右測點(diǎn)進(jìn)行復查測量，復查測量結果應一并反映在測量原始數據表中。 </p> <p> D.3.4 測量報告。 </p> <p> 城市區域土壤氡調查報告的主要內容應包括： </p> <p> 1 城市地質(zhì)概況、放射性本底概況、土壤概況; </p> <p> 2 測點(diǎn)布置說(shuō)明及測點(diǎn)分布圖; </p> <p> 3 測量?jì)x器、方法介紹; </p> <p> 4 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