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Water-to-air stopping-power ratio

(s/ρ)_w,air = 1.100

(sˉρ)w,air≈1.102+0.025(0.57−TPR20,10)\left(\frac{\bar s}{\rho}\right)_{w,\mathrm{air}}\approx 1.102+0.025(0.57-\mathrm{TPR}_{20,10})

Teaching fit: (s/ρ)_w,air ≈ 1.102 + 0.003 × (10 − TPR20,10)×10 for MV photons (order of magnitude).

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