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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 power exploits a fitted function on the tabulated data from ESTAR code at NIST, based on ICRU Report 37. The tables are reproduced with a maximum discrepancy < 1%.
The radiative stopping powers are those evaluated in ESTAR (e.g., see webpage). The tables corresponding are reproduced with a maximum discrepancy < 1%.

Target Materials
Target Selection:
Element:
Spectral Fluence
values:
use dot "." as decimal separator;
at least, a pair (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.
Electronic stopping power (red) in Silicon and electrons spectral fluence (blue) assuming an orbit around Jupiter, at Europa altitude, during 1 year mission:

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

NOTE:
  • Output table and graph include the stopping power in units of Mev cm2/g (i.e., the mass stopping power).
  • The lower energy limit is 1 keV
  • The higher energy limit is 10 GeV
  • FINAL REMARK:
  • For the conversion from electronic stopping power to dose, the energy lost by the incoming electron for ionization is assumed to be fully absorbed by the medium - i.e., it is supposed to to be thick enough to fully absorb the kinetic energy of emitted delta rays - and the electron energy is almost constant while the particle traverses the absorber. In addition, radiative phenomema are assumed to be negligible - as, for instance, when the electron energy is well below that critical (for a discussion see Result) - e.g., see for a definition and a discussion Sect. 2.3.3.5 in Leroy and Rancoita (2016) and references therein -, and subsequent interactions of emitted photons are not taken into account. The discussion on the relevance of ionization energy loss (e.g, see Sects. 2.1-2.1.3.6 in Leroy and Rancoita (2016) and references therein) with respect to radiative emission of electrons can be found, for instance, in Sects. 3.1-3.1.3.3 and 3.2 of Leroy and Rancoita (2016) and references therein.