透明膠帶妙用多 可拍Ｘ光片

[TC]

透明膠帶妙用多 可拍Ｘ光片

中央社／巴黎二十二日法新電

　科學家指出，透明膠帶不僅透明，還有透視功能，因為這種產品可用來拍攝 X光片。

　研究人員發現，由一捲膠帶截取一段會釋放出微量的脈衝波，足以拍攝手指和手骨的影像。

　加州大學洛杉磯分校一個研究小組提出這項奇特的發現，激發他們進行研究的靈感源自一九五零年代蘇聯科學的論調。蘇聯科學家發現，以適當的速度撕下膠帶時，會產生能量頻譜上 x射線部分的脈衝。

　研究報告將刊登在明天出版的英國「自然」期刊。研究人員利用一台自動撕膠帶機器，以每秒三公分的速度，撕下一捲標準規格、不傷照片的 3M膠帶。

　在真空狀態下，他們測量到足可供攝影的 X光。

　研究共同撰稿人卡瑪拉接受「法新社」電話訪問時說：「我們一度不相信它，實在讓人難以置信。」他意指研究小組一開始存疑。

　「我們對著手，照了幾張照片，看到骨頭影像，證實了它的可能性。我們照了許多張照片，真是太棒了。」

=======================================

真空中撕透明膠帶 會釋放X光

更新日期:2008/10/24 09:52 【中國時報　潘勛／美聯社紐約廿二日電】

　美國物理學家發現，只要在真空室內撕下常見的透明膠帶，就會釋出大量的Ｘ射線。專家甚至用這樣產出的Ｘ射線拍下自己手指的Ｘ光照片，此外還為這項發現申請專利，打算未來研發新型Ｘ光成像機。

　事實上，在五十多年前，有些蘇聯科學家便報告說，把透明膠帶由玻璃上撕下來時，會出現Ｘ光。但美國新的研究成果顯示，在適當條件下，人力就可以弄出很多Ｘ射線。

　加州大學洛杉磯分校研究生艾斯科巴與其同儕把這項發現發表在廿三日出刊的最新一期《自然》周刊。艾斯科巴指出，只要能掌控這種程序，或許能造出便宜的Ｘ光成像機，供緊急醫護人員使用，或者在電力昂貴及難以取得電力的場合下使用。

　洛杉磯加大完成的新研究，是在真空室中用一台機器以每秒約三公分的速度，把成捲的尋常透明膠帶撕開，Ｘ射線的脈衝波便由膠帶分離處迅速湧出。艾斯科巴表示，那是因為電子由膠帶捲跳出來，撞到透明膠帶有黏性的那一邊，然後速度減緩，過程中電子便釋出Ｘ射線。

　那麼使用透明膠帶會不會對人體造成健康傷害呢？艾斯科巴表示，有空氣存在，就不會造出Ｘ射線；必須在真空中才行。「美國放射學院」所轄「醫用物理學委員會」主席赫維齊表示，由這項新發現來研發Ｘ光成像機的點子很有意思，值得進一步研究。

[baleno]

今天聽PODCAST聽到這段。
原則上有一個很重要的前提，就是「真空」
沒有真空，瞬間高壓電一下就消失了，X光也製造不出來。

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