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Thickness Enter the soil slab thickness in m. Choose the probability distribution and fill in the half-width limits or standard uncertainty. Density Enter the density in kg/m3 . Choose the probability distribution and fill in the half-width limits or standard uncertainty. Activity Content Enter the activity content in Bq/m3 or relative activity content in the soil slab (or slabs). Choose the probability distribution and fill in the half-width limits or standard uncertainty. Input for the exponential model In this case, activities penetrate exponentially into the soil. The vegetation contains no activity. The soil density is assumed to be uniformly distributed. Relaxation Length Enter the relaxation length in cm. Choose the probability distribution and fill in the half-width limits or standard uncertainty. 9