Calculation and Data Processing:

As can be seen from the gamma ray spectra of irradiated samples of natural matrix such as Neem leaves in Figures, these are complex with closely lying multiple peaks. The continuum under the peak is due to Compton Effect from the γ-rays of higher energies and the background. The peaks show Gaussian distribution as the first contribution to the photo peak in a semiconductor detector is due to statistical fluctuations in sharing the absorbed energy between ionization and heating the crystal network. It is not practical to analyze these spectra manually. With the development of high resolution semiconductor detectors and 4, 8 and 16 K multichannel analyzers, γ-ray spectrometry along with computers with suitable software has become an important tool for the detection of natural and artificial radioactivity and activation analysis of complex samples. Important steps in the computerized analysis of photo peaks involve;

• Smoothening of experimental data
• Peak searching
• Selection of fitting intervals
• Peak energy calculation
• Peak area calculation