A Study of Transmitted Photon Spectra of 133Ba Through a Soil Medium

The transmitted photon spectra of 133Ba gamma rays have been recorded and studied as a function of dimensions of a soil medium. In these studies a multiple-scatter peak is observed in the soft part of the spectrum. The longitudinal thickness of the soil medium is seen to affect only the intensity of the peak, whereas the variation in transverse thickness affects both the intensity and energy of the peak. A reversal of the trend of the multiple-scatter peak intensity to increase with transverse thickness occurs as the longitudinal dimension increases.