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radiation detection (radiation detectors (basis (collection of the…

- - - - detect individual photons. photon counting: individual detection of each photon. required for NM imaging
    - - measures average rates of photon flux. avoids dead-time losses.
  - - - radiographic film
    - - ionization chamber: very low pulse. needs amplification
        
        dosimetry
        
        automatic exposure control
        
        proportional counter
      - geiger
        
        used only as a counter. high sensitivity
      - semiconductor
      - gas filled detectors
    - - scintillators + pmt
      - TLDs