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SR-NIEL – 7

Screened Relativistic (SR) Treatment for NIEL Dose

Nuclear and Electronic Stopping Power Calculator

(version 10.14)

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Probability in cm^2/g of energetic recoil nuclei caused by protons or ions

Incident Particle:
Target Materials
Target Selection:
N° Elements:
Target Material Z Stoichiometric Index or Element Fraction
Energy ranges
Minimum Energy: [MeV]
Maximum Energy: [MeV]
Recoil Energy Eener: [MeV]
Additional Energies (optional): [MeV]


EXAMPLE:
Energetic nuclear recoil probability for Protons in Silicon with Eener=0.1 MeV:

NOTE:
  • The sr-treatment has accuracy of about some percent at 50-200 keV/nucleon (see Sect 2.2.2 in [Leroy and Rancoita (2016)]).
  • Within sr-treatment, the Probability for an incoming proton or ion to generate a recoil nuclei above the requested Eener value is derived by

    (total probability in cm2g-1) x (absorber density in g cm-3) x (traversed thickness in cm),

    where the "total probability in cm2g-1" is obtained by the web calculator, absorber density and traversed thickness are defined by the user; Eener is the the lower limit of recoil energy (for explanation see Energetic Nuclear Recoil Page)
  • The Probability depends on the energy of the incoming particle.
  • Energetic nuclear recoil probability for compounds can be determined by means of Bragg's rule, i.e., the overall Probability in units of cm2/g is obtained as a weighted sum in which each material contributes proportionally to the fraction of its atomic weight. An example for selection, with water (H2O) as target, follows:

    or equivalently

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