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Skyshine (NCRP 151 approximation)

Ḣ = 9.397e-7 mSv/h

H˙∝Broof D˙0 Ω1.3/d2\dot H \propto B_{\mathrm{roof}}\,\dot D_0\,\Omega^{1.3}/d^2

Ḣ ≈ 2.5×10⁻² (B_roof Ḋ_0 Ω^{1.3}) / d² (empirical, mSv/h, teaching form).

Laser