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Electron range in water

R = 4.664 g/cm²

Rp≈0.52E−0.376 cm (2.5−20 MeV)R_p \approx 0.52E-0.376\ \mathrm{cm}\ (2.5{-}20\,\mathrm{MeV})

Approximate range: E/2 rule of thumb or Katz-Penfold by energy.

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