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Positron range (empirical)

R_FWHM = 0.8750 mm

RFWHM≈0.35 Emean mm waterR_{\mathrm{FWHM}}\approx 0.35\,E_{\mathrm{mean}}\ \mathrm{mm\ water}

FWHM range in water ≈ 0.35 × E_mean(MeV) mm — a blur on top of the 2-mm annihilation physics.

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