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Spencer–Attix cavity dose

D_med = 0.01119 Gy

Dmed=Dgas(Lˉρ)gasmedPflPwallD_{\mathrm{med}}=D_{\mathrm{gas}}\left(\frac{\bar L}{\rho}\right)_{\mathrm{gas}}^{\mathrm{med}}P_{fl}P_{\mathrm{wall}}

D_med = D_gas × (L̄/ρ)_gas^med × P. Restricted stopping-power ratio with cutoff Δ.

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