attenuation coefficient

[7.5.5]

NOTE: This term was added in RP-16-17 Addendum 3.

(μ)

The decrement in flux per unit distance in a given direction within a medium and defined by the relation:

   ɸ(r) = ɸ(0)·e^–µr  ,

where ɸ(r) is the flux at a distance r from a reference point hav­ing flux ɸ(0).

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