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Figure 3.4. Effects <strong>of</strong> natural radiation on sediment particles. Silt-sized grains are<br />

irradiated by alpha, beta, gamma <strong>and</strong> cosmic radiation but s<strong>and</strong>-sized grains are only<br />

irradiated by beta, gamma <strong>and</strong> cosmic radiation, since alpha particles have a short range<br />

<strong>and</strong> only penetrate <strong>the</strong> outer rind <strong>of</strong> s<strong>and</strong>-sized grains. Of <strong>the</strong> four radiation types that<br />

contribute to <strong>the</strong> dose rate, cosmic radiation has <strong>the</strong> greatest penetration (Source: Aitken,<br />

1998).<br />

49

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