radioactivity [ˌredioækˈtɪvɪti]

例句:

• the process of decontaminating areas exposed to radioactivity
  清除受放射污染地区有害物质的过程
  
• The soil contains 30 times the acceptable level of radioactivity.
  这片土壤受到了高于标准30倍的辐射.
  
• The site was found to be contaminated by radioactivity.
  发现此地受放射线污染.
  
• Those in spacecrafts use radioactivity and produce little power.
  来自SA
• That is a lot of radioactivity, she said.
  来自VOA
• So what of the radioactivity released at Fukushima?
  来自BBC