Patent ID: 11933744
Assignee: CHINA INSTITUTE OF ATOMIC ENERGY
Field: Measurement (Instruments)
Classification: CPC G  Y | IPC G

Claim 7:
8. The method according to claim 7, wherein determining the original reconstruction density of the corresponding standard transmission object in the step A08 comprises:
obtaining a counting rate I0(E) of the γ-ray without placing the corresponding standard transmission object;
obtaining a counting rate I (E) of the γ-ray by placing the corresponding standard transmission object at a preset position; and
performing a parallel approximation on the γ-ray according to Beer's law, wherein the original reconstruction density ρ(E) of the corresponding standard transmission object is:, ρ
    ⁡
    
      (
      E
      )
    
  
  =
  
    
      
        μ
        ⁡
        
          (
          E
          )
        
      
      
        μ
        m
      
    
    =
    
      
        -
        
          1
          d
        
      
      ⁢
      
        1
        
          μ
          m
        
      
      ⁢
      ln
      ⁢
      
        
          I
          ⁡
          
            (
            E
            )
          
        
        
          
            I
            0
          
          ⁡
          
            (
            E
            )
          
        
      
    
  

wherein μ(E) represents a linear attenuation coefficient of the γ-ray with an energy E passing through the corresponding standard transmission object, and μm represents a mass attenuation coefficient of water.