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Old 04-28-2011, 07:10 PM   #1
qingxiu33
 
Posts: n/a
Default x光机

 x光机,mbt shoes clearance
  x光机是发生X光的装备,其重要由X光管和X光机电源以及把持电路等组成,而X光管又由阴 极灯丝 (Cathod)跟阳极靶(Anode)以及真空玻璃管组成,X光机电源又可分为高压电源和灯丝电源两局部 ,其中灯丝电源用于为灯丝加热,高压电源的高压输出端分辨家在阴极灯丝和阳极靶两端,供给一个高压电场使灯 丝上活泼的电子加速流朝阳极靶,构成一个高速的电子流.
  X光的产生方式
  制动辐射(Bremsstrahlung)和特性辐射(Characteristic)。制动辐射:高 速电子忽然减速后,其动能以X光的情势释放出来;特性辐射: 高速电子撞击原子和外围轨道上电子,a&f coupon,使之游离且开释出能量,这种能量即X光。
  x光机基础原理
  X-ray 是由德国仑琴教学在1895年所发明。这种由真空管发出能穿透物体的辐射线,在电磁光谱上能量较可见光强, 波长较短,频率较高,相相似之辐射线有宇宙射线,X-ray等。
  
产生X-Ray必需要有X光球管,而X光球管根本结构必需领有:
  阴极灯丝 (Cathod)
  阳极靶 (Anode)
  真空玻璃管 (Evacuated glass envelope)
  当然还要有电源能量供给
  X-ray 产生方法有两种
  Bremsstrahlung (制动辐射) 高速电子突然减速后,其动能改变成能量释放出来,此能量即为X-ray,且此能量会随减速之水平而有所不同,pink perfume
  Characteristic (特性辐射) 高速电子撞击原子和外围轨道上电子,使之游离且释放之能量,即为X-ray。
  诊断用X-ray其产生方式所占比例: 30% 特性辐射70% 制动辐射
  X-Ray特征
  能穿透物体 为不可见光 於电磁波光谱内 波长范畴广 直线散射 光速进行 能使萤光物资发光 能使底片感光 会造成散射线
  当X-ray进入物体时,会有三种情况产生:
  被物体接收 (Absorption)
  产生散射现(Scatter)
  穿透(Penetration)
  影响Radiographic Quality之三因素:
  Density (黑化度)- mAs
  Contrast(对照度)- kVp
  Sharpness(清楚度)- motion, Geometric
  Distortion(失真度)- position, angle
  X-Ray波长与Film上contrast之关联
  在X-ray穿透过病人,其穿透率主要和病人组织构造及X-Ray波长有关。
  短波长X-ray (high kV)
  能量较高,穿透性好,造成在Film上较低之比较度(low contrast)。
  长波长X-ray (low kV)
  能量较低,较易被人体所吸收,穿透性较差,而在Film上对比度较高(High contrast)。
  运用
  X光机普遍利用于医疗卫生,迷信教导,工业各个范畴,coach handbags,例如X光机可用于病院帮助医生诊断疾病,discount polo shirts,用于产业的无损探伤,火车站和机场的保险检讨等等。
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