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Radiological path length

d_eff = 8.000 cm

deff=∑iρirelΔxid_{\mathrm{eff}}=\sum_i \rho_i^{\mathrm{rel}}\Delta x_i

Effective water depth d_eff = Σ ρ_i Δx_i (physical-density or relative-stopping-power scaling).

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