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D(r θ)=S

k

Λ[G(r θ)/G(r

0

θ

0

)]g(r)F(r θ)

,

,

,

,

S

k

= air kerma strength of the source

Λ= dose rate constant

G(r,θ)=geometry factor

g(r)=radial dose function

F(r,θ)=anisotropy function