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<div class="language"> <div class="top"> <span class="current">CN</span><i></i> </div> <p class="content">  </p> </div>  <a href="#mmenu" class="navbtn"><img src="/template/muban1/static/picture/nav.png" alt="" /></a> </div> <div class="service_banner news_banner"> <div class="container"> <h1>新聞中心</h1> <div class="title_box clearfix"> <a href="/?company/" class="cur"><span><img src="/template/muban1/static/picture/news_icon.png" alt="" /></span> <em>公司動態</em></a> <a href="/?industry/"><span><img src="/template/muban1/static/picture/news_icon2.png" alt="" /></span> <em>行業動態</em></a> <a href="/?news_12/"><span><img src="/template/muban1/static/picture/news_icon3.png" alt="" /></span> <em>常見問題</em></a> </div> </div> </div> <div class="news_box"> <div class="container clearfix"> <div class="left"> <div class="news_con"> <h3>電離輻射定義</h3> <div class="name"><span>文章出處：本站</span><span>作者：admin</span><span>發表時間：2020-11-28</span></div> <div class="con"> <p style="text-indent: 2em;"><span style="font-size: 18px;">電離輻射是一種有足夠能量使電子離開原子所產生的輻射。一種輻射來源于一些不穩定的原子，這些放射性的原子(指的是放射性核素或放射性同位素)為了變得更穩定，原子核釋放出次級和高能光量子(γ射線)。上述過程稱為放射性衰變。例如，自然界中存在的天然核素鐳、氡、鈾、釷。此外，存在于人類活動(例如在核反應堆中的原子裂變、電子加速器所產生電離，人工合成鈷-60等)和自然界活動，同樣它們也釋放出電離輻射。在衰變過程中，輻射的主要產物有α，β和γ 射線。X射線是另一種由原子核外層電子引起的輻射。</span></p><p><br/></p><p style="text-indent: 2em;"><span style="font-size: 18px;">α粒子</span></p><p><br/></p><p style="text-indent: 2em;"><span style="font-size: 18px;">α粒子是帶正電的高能粒子(He原子)，它在穿過介質后迅速失去能量。它們通常由一些重原子(例如鈾，鐳)或一些人造核素。α粒子在介質中運行，迅速失去能量，不能穿透很遠。但是，在穿入組織(即使是不能深入)也能引起組織的損傷。α粒子通常被人體外層壞死肌膚完全吸收，α粒子釋放出的放射性同位素在人體外部不構成危險。然而，它們一旦被吸入或注入，那將是十分危險。α粒子能被一張薄紙阻擋。</span></p><p><br/></p><p style="text-indent: 2em;"><span style="font-size: 18px;">β粒子</span></p><p><br/></p><p style="text-indent: 2em;"><span style="font-size: 18px;">β射線是一種代電荷的，高速運行，從核素放射性衰變中釋放出的粒子。人類受到來源于人造或自然界(氚，C－14等)β射線的照射，β射線比α射線更具有穿透力，但在穿過同樣距離，其引起的損傷更小。一些β射線能穿透皮膚，引起發射性傷害。但是它一旦進入體內引起的危害更大。β粒子能被體外衣服消減，阻擋或一張幾毫米厚的鋁箔完全阻擋.</span></p><p><br/></p><p style="text-indent: 2em;"><span style="font-size: 18px;">γ粒子</span></p><p><br/></p><p style="text-indent: 2em;"><span style="font-size: 18px;">同可見光，X射線一樣，γ射線是一種光量子。在放射性衰變過程中γ射線伴隨著α，B射線一同釋放出。它們既不帶電荷，又無質量，但具有很強穿透力。天然核素鉀-40及人工核素钚－239和銫－137是環境中γ射線主要來源。 γ射線能輕易穿透人的身體，對人體造成危害。幾英尺厚的混凝土能阻擋γ射線。</span></p><p><br/></p><p style="text-indent: 2em;"><span style="font-size: 18px;">X射線</span></p><p><br/></p><p style="text-indent: 2em;"><span style="font-size: 18px;">X射線是帶電粒子與物質交互作用產生的高能光量子。X射線與γ射線有許多類似特性，但它們起源不同。X射線由原子外部引起，而γ射線由原子內部引起。X射線比γ射線能量低，因此穿透力小于γ射線。成千上萬臺X射線機在日常中被運用于醫學和工業上。X射線也被用于癌癥治療中破壞癌變細胞。由于它的廣泛運用 X射線是人造輻射的最大來源。幾毫米厚的鉛能夠阻擋住X射線。</span></p><p><br/></p> </div> <div class="bottom clearfix"> <ol class="clearfix"> <li><a href="/?company/28.html"><span>上一篇：</span>核技術應用的產業化發展</a> </li> <li><a href="javascript:;"><span>下一篇：</span>沒有了！</a> </li> </ol> <a href="/?article/" class="return">返回列表</a> </div> </div> </div> <div class="right"> <div class="right_nav"> <h3>相關欄目</h3> <ul class="clearfix"> <li><a href="/?company/" 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