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    權威專家駁"核霧染"之說--新華網采訪北大教授潘小川與核與輻射安全中心副總工陳曉秋實錄

    主持人:各位網友大家好,歡迎您收看新華訪談。中國氣象局1月14日發布2013年《中國氣候公報》,公報當中顯示2013年的霾天創52年來最多。其中,江蘇、安徽、浙江、河南、河北、北京、天津等地的部分地區霾日數超過100天。近日一條突然躥紅的網帖稱"空氣中含有放射性元素鈾是目前國內大范圍霧霾的原因"。"核霧染"這個新詞開始"走紅"網絡。核霧染這個提法到底靠不靠譜?霧霾會對公眾健康帶來什么樣的影響?今天新華網為大家邀請到北京大學公共衛生學院教授潘小川和環境保護部核與輻射安全中心副總工程師陳曉秋兩位專家走進我們的演播室,歡迎兩位。

    陳曉秋:主持人好。

    潘小川:你好。

    霧霾難散只因鈾?

    隨著霧霾天氣的持續,一個新名詞"核霧染"開始進入人們的視野。近日一個突然躥紅的網帖提出了一個爆炸性說法:"空氣中含有放射性元素鈾,這是目前國內大范圍霧霾的原因"。發帖者宣稱,霾經久不散是因為空氣中漂浮著大量帶電的粉塵顆粒,而這表明空氣中存在放射性物質。

    不少讀者來信對此提出了疑問。為此,本版邀請環境保護部核與輻射安全專家委員會委員、原子能科學研究院研究員劉森林為大家一一解惑。

    讀者:據傳,我國內蒙古鄂爾多斯地下發現大型鈾礦和煤炭資源,因為兩者共存于同一地區,從而形成了所謂鈾煤,也就是煤中含有鈾元素。發帖者稱,煤炭中雜質攜帶了10%的鈾礦石。對于這一說法,您是否認同?

    劉森林:煤炭里含鈾10%就是鈾礦了,從目前查到的資料來看,我國鈾煤的鈾含量基本上都在2%以下。

    讀者:發帖者稱,霧霾里存在放射性物質,即鈾。對于這種說法,您做何判斷?

    劉森林:天然鈾到處都存在,空氣、土壤、水及建材里都有。但是空氣中放射性的主要來源是氡,鈾是極其微量的。事實上,室外空氣中氡和鈾帶給人們的輻射劑量都很小,但是鈾的相對貢獻更小。

    "核霧染"——霧霾是放射性污染嗎?

    作者:環境保護部核與輻射安全中心研究員 陳曉秋

    本文通過介紹輻射環境監管的相關信息,特別是針對人為活動導致天然輻射水平升高的一些研究,與讀者共享礦產資源開發利用輻射環境監管的信息。

    一、"核霧染"——"霧霾綜合癥"

    多數關心核與輻射安全的人,都看過曾獲奧斯卡獎提名的影片——《中國綜合癥》(The China Syndrome)。片名《中國綜合癥》意指:如果美國核電廠反應堆熔化,則會熔穿地球直到對面的中國,這是一個非常滑稽的玩笑。該片于1979年3月16日上映, 恰好是美國賓夕法尼亞三哩島核電站發生核事故的前12天。正是三哩島事件,使得該部影片一鳴驚人,產生了巨大的轟動效應。

    "中國綜合癥"這個術語首見于1971年,核物理學家拉爾夫.蘭普(Ralph Lapp)用這個術語描述:熔穿反應堆壓力容器,穿透下層水泥,大量熱燃料進入反應堆下的地層,熔穿一個洞到中國。實際上,這是不可能的,而且是一種極其不可能的設想。

    近日一條突然躥紅的網帖稱"空氣中含有放射性元素鈾是目前國內大范圍霧霾的原因"。承蒙好友的推薦,在網上搜索和閱讀了關于"核霧染"的幾篇博文,《中國煤炭的崩潰和核霧染災難》、《中國核霧染災難和肺癌大爆發》和《從海灣戰爭癥候群再談中國核霧染災難》。看后頗有感受,盡管"核霧染"之說存在科學和邏輯錯誤,正如上述博文作者給中國青年報記者的回復稱"有可能最終事實證明我把霧霾歸于鈾輻射是錯的,那沒有什么,錯了就錯了",但為何"核霧染"這個新詞能夠"走紅"網絡?究其原因,主要是霧霾不利于健康已成為共識,公眾對不斷出現的霧霾天氣憂心忡忡,而不能得到迅速地緩解和根除。此外,公眾對于電離輻射的認知遠不及非放射性污染物,實在經不起將霧霾歸因于"核霧染"這樣的恐嚇。因此,將這種現象稱為"霧霾綜合癥"似乎也不為過。

    二、霧霾中存在著放射性核素不足為奇

    人類受到天然輻射源電離輻射照射是持續性的、不可避免的。天然(電離)輻射照射主要來自兩個方面:進入地球大氣層的高能宇宙射線粒子和地殼中原生的、在環境中到處存在的放射性核素,包括土壤、空氣、水、食物和人體內存在的放射性核素。因此,在霧霾中存在著放射性核素也不足為奇。

    聯合國原子輻射影響委員會(UNSCEAR)對天然輻射...

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