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ASI Supported Irradiation Facilities

ASI-ENEA-INFN agreements

(version 3.1.7)

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This is the SR-NIEL fluence to dose calculator for protons and ions. Use the following link to access the calculators:

- Protons & Ions fluence to dose calculator


How to use this NIEL Calculator

This tool calculates the NIEL Dose for a particle incident on a material and for a given energy and fluence. For information about the computation method of NIEL take a look at the NIEL and Displacement Stopping Power page.

The input parameters and options for the tool are described below. When the input form has been completed, pressing the "CALCULATE" button will start the calculation and open the "Results" page (allow for pop-up in your browser settings). The result page will be also linked at the bottom of the calculator page.

Input Parameters:

- Incident particle
- Proton and ion model
- Target material
- Energy of the incoming particle with corresponding fluence


Incident Particle

Using the pull down menu, the user can select the species of the incident particle, either a proton or one of the elemental ions.

Proton and Ion Model

When a proton or ion is selected as incident particle, it is possible to specify the different contribution to the total non-ionizing energy loss that is returned: the Coulomb scattering contribution, the contribution of the Hadronic interaction or the Total contribution (Hadronic + Coulomb).

In the present NIEL calculators, for protons up to 1 GeV and alpha-particles up to 1 GeV/nucleon impinging on elements with atomic number from Z=4 up to Z=51, as already mentioned in NIEL and Displacement Stopping Power page, the hadronic contributions were interpolated or extrapolated from those obtained from [Jun et al. (20032004,2017)] regarding 10 absobers, i.e., C, Al, Si, P, Ga, Ge, As, In, Cu, Se with corresponding displacement thresold energy of 35, 20, 21, 9, 10, 20, 10, 7, 25, 20 eV, respectively .For silicon absorbers, in addition, the hadronic contribution for energies from 1 up to 24 GeV was obtatined from [Huhtinen (2002)].
As default option (no scaling), no Ed depence is included for the hadronic contribution to NIEL. It has to be remarked that such a beviour is consistent with the results obtained for neutron damage functions with MeV neutrons (up to 20 MeV) by means of NJOY-2012 code (e.g. see NJOY based neutron NIEL calculator). As alternative option (linearly scaled), the hadronic contribution are linearly varied with respect to the calculated by the same amount found for Coulomb contributions.

Target Material

In this section it is possible to specify the composition of the target material selecting the number of elements in the compound. The required parameters for each element are:

- Atomic number (Z)/Chemical symbol
- Stoichiometric index or element fraction
- The displacement threshold energy [eV]

Dose Calculation

This section defines the energy of the incoming particle with corresponding fluence.
The input format is one point per line (Energy - Fluence , separated by a space or tab); it is also possible to copy and paste values.
Use point "." as decimal separator, a space or tab to separate energy value from fluence and use separate raw for adding energy-fluence pair.
If Hadronic calculation is included (Hadron only and Coulomb+Hadron cases) the Maximum energy of the incoming spectral flunce is limited to 1 GeV/nucleon (due to hadronic interaction data availability); for proton in silicon absorbers the Maximum energy is limited at 24 GeV.



The result page contains the input parameters and the result table. For every energy-fluence points the NIEL dose is calculated in [MeV g-1] and [Gy].