| Popis: |
To determine the effect of lateral dimensions on the intensity of the transmitted gamma spectra through light materials, the transmitted spectra from a mercury-203 source are recorded for successively increasing lateral thicknesses of nuclear grade graphite. It is found that intensities of the multiple-scatter peak and of the total radiations increase with lateral thickness and reach a maximum when the source is surrounded by about a 5 mean free path thickness of the material. As the whole medium takes part in the multiple-scattering, the increased lateral dimensions increase the probability of multiple-scattering, resulting in increased transmitted intensities. |
