Patent ID: 7947957

Claim:
A data processing device for processing a reference background spectrum and a measurement spectrum of a radioactive material represented by a multichannel spectrum to acquire energy region information of detected rays, said data processing device comprising one or more microprocessors or digital signal processors, or software modules running on said one or more microprocessors or digital signal processors, or a combination thereof, for carrying out the steps of: degenerating said multichannel spectrum into a degenerated spectrum of limited channels, each channel of said degenerated spectrum representing an energy region; calculating a background degenerated spectrum and measurement degenerated spectrum based on said background spectrum and said measurement spectrum corresponding to said degenerated spectrum of limited channels respectively; calculating an energy ratio based on the calculated background degenerated spectrum and measurement degenerated spectrum; searching a peak value in the calculated energy ratios; and determining a corresponding energy region of said gamma rays based on the searched peak value in the energy ratios.