Arnold Dirk, Sima Octavian
Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany.
Appl Radiat Isot. 2004 Aug-Sep;61(2-3):117-21. doi: 10.1016/j.apradiso.2004.03.031.
To avoid losses due to coincidence summing, the efficiency calibration of gamma-spectrometers is often carried out by means of radionuclides emitting only one photon during a single decay. Calibration with this kind of radionuclides has, however the disadvantage that the energy range of the gamma rays (46 keV<E<1115 keV) is limited. Coincidence-summing corrections can be calculated with the Monte Carlo program Germanium Spectrometry Correction for multi gamma radionuclides which emit photons with energies above this range. The efficiency curve as a function of energy can therefore be extended up to 2.7 MeV with uncertainties below 4%.
为避免因符合相加造成的损失，γ能谱仪的效率校准通常借助于在单次衰变中仅发射一个光子的放射性核素进行。然而，使用这类放射性核素进行校准存在一个缺点，即γ射线的能量范围（46 keV < E < 1115 keV）有限。对于发射能量高于此范围光子的多γ放射性核素，可使用蒙特卡罗程序“锗能谱校正”来计算符合相加校正。因此，作为能量函数的效率曲线可扩展至2.7 MeV，不确定度低于4%。
