Bethe-formula VS SRIM for Uran in Polycarbonate

  1. Hello everybody,

    I investigate polycarbonate foils (makrofol) of 90 μm thickness irradiated by U-ions with a charge of z= +28 and a specific energy of 11.4MeV/nucleon.

    My problem is that in the Srim simulations the charge z is not questioned (or needed?), whereas the stopping power (-dE/dx) in the Bethe-formula is proportional to z^2.

    I compared the dE/dx values of SRIM ( with the Bethe-Calculator of Sven Geier ( and my own Bethe-calculations, they all vary.

    My aim is the Bragg-curve, but therefore i would like to have the correct values/description of the stopping power.

    Im sorry for my bad english.
  2. jcsd
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