Energy Calibration and Inverse-Square Law of Radiation in Gamma-Ray Measurement Using a Scintillation Detector for Laboratory Experiments

Figure 4

Typical experimental data of energy versus channel number measured for the photopeaks of 662 keV of ¹³⁷Cs, 1173 and 1333 keV of ⁶⁰Co, and 1275 keV of ²²Na. Experimental errors of the channel are within the symbols. Lines are the least-squares fits to the data. L1 denotes the conventional linear function fit without considering the origin, L10 denotes the linear function fit considering the origin, L20 denotes the quadratic function fit considering the origin, and L30 denotes the cubic function fit considering the origin.