TG-51 gives a reference for the reference depth for electron beam, which is Ref.#17.Quote: For electron beam reference dosimetry in radiotherapy, it is shown that by choosingthe reference depth as dref=0.6R50 -0.1 cm, ..., the Spencer-Attix water-to-airstopping-power ratioat dref is given by (L/p)(water to air) = 1.2534-0.1487(R50)exp(0.2144).This is the magic.
REF YAHOO STUDY GROUP 4/23/08
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