Physics Athens 2016

Intermezzo to introduce ionometric standards (I)

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water P

D w  (S/  ) c,w Dose in a point P in water: =  w

w

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w = secondary electron fluence [electrons / m 2 ] S c,w = restricted collision stopping power = dE/dx, energy loss electrons per meter travelled (excl.  -rays, and brehmstrahlung) - known as function of electron energy, medium (calculations, measurements)



w = density of water [kg/m 3 ]