本底

• Backgroung ambient air pollution
  本底污染
• Background monitoring station
  本底监测站
• Background internal friction
  本底内摩擦
• The background of neutron is rejected by the technique of pulse shape discrimination
  用脉冲形状甄别技术去除中子本底。
• Secondary ion background
  二次离子本底
• Background doping effect
  本底掺杂效应
• Background mass spectrum
  本底质谱图
• Background counting rate
  本底计数率
• Background of a device
  装置本底
• It must be emphasised that the above limits are in addition to the expected levels of background radiation
  必须强调上述上限并未把预期本底辐射水平计算在内。