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SR-NIEL – 7

Screened Relativistic (SR) Treatment for NIEL Dose

Nuclear and Electronic Stopping Power Calculator

(version 10.14)

Proton High AMS02 small

The current web calculator for electronic stopping powers exploits a) the "SRIM Module.exe" (with an upper energy limit of 5 GeV/amu) included in SRIM 2013 code (SRIM Tutorials) - whose maximum available energy is 10 GeV/amu -, i.e., the used electronic stopping power tables are those provided by "SRIM Module.exe" code with a low energy limit of 1 eV; and b) the energy-loss equation (i.e., Eq. (2.18) in Sect. 2.1.1 of [Leroy and Rancoita (2016)]) as discussed here. The overall approach is referred to as SR-treatment framework.


Incident Particle:
Mass [amu]:
Target Materials
Target Selection:
N° Elements:
Gas Target:
Target Material Z Stoichiometric Index or Element Fraction
Traversed Path [g cm-2]
Number of steps:
Spectral Fluence
values:
use dot as decimal separator;
at least, three rows (energy and spectral fluence) of values are required
Energy
[MeV]
Spectral Fluence
[cm-2 MeV-1]


EXAMPLE:
Copy and paste the data here to reproduce the following example.
Protons spectral fluence during ESA Juice mission moderated by 50 mils of Al (0.3429 [g cm-2]):

Spectral fluence data are calculated with JOREM Model implemented in SPENVIS
assuming a 4 sr solid angle exposure.

NOTE:
  • The lower energy limit is 1 eV
  • The default traversed path is that for 50 mils of Al
  • The lower limit of traversed path is equivalent to about 5 μm of Si (1.16x10-3 [g cm-2]), e.g., 0.96 cm in Dry Air at sea level with density equal to 1.20484x10-3 g/cm3 (as implemented in SRIM from ICRU-37 table 5.5).
  • Target selection for the results obtained in the EXAMPLE section
    Selection for Protons in Silicon:

    Selection for Protons in GaAs:

    Selection for Protons in Water Liquid:

  • In SRIM, gas targets are dealt differently from those solid. User can select the target as a gas only for following elemental targets: H, He, N, O, F, Ne, Cl, Ar, Kr, Xe, Rn.
  • For few compounds belonging to the ICRU list the parameters employed for the energy loss formula (including those for the densiity effect) are reported in Table II of Sternheimer et al. (1984).