Energy Loss and Straggling of MeV Energy Ions through Biological Samples
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Abstract
In order to study the energy loss and its straggling of MeV energy ions in biological samples, onion membrane samples with different thickness were irradiated with 1.0, 1.8, 2.8 MeV H+ and 4.5 MeV He+ , respectively. The energy loss and straggling of these ions after penetrating the biological samples were measured with transmission energy spectrum. The experimental results show that the energy losses of MeV energy ions in the biological samples mentioned above are consistent with TRIM simulation but their energy straggling are different from the simulations. Considering the inhomogeneous mass density and structure of biological materials, we modified Bohr’s energy straggling theory, and then the results are in good agreemen with the experimental energy straggling values.
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