NIEL Conversion Tool

Proton non-ionizing energy loss lookup, fluence conversion, displacement damage dose, and 1 MeV neutron equivalent calculations using Jun et al. (IEEE TNS, 2003) data

v1.0 · Apr 2026 Help & Reference

Disclaimer: This tool is provided for preliminary analysis and educational purposes only. NIEL data is from Jun et al., “Proton Nonionizing Energy Loss (NIEL) for Device Applications,” IEEE Trans. Nucl. Sci., vol. 50, no. 6, pp. 1924–1928, Dec. 2003. Users are solely responsible for verifying all outputs against their own analysis and applicable standards before making any design, test, or mission decisions. Space RHA LLC makes no warranties regarding accuracy or fitness for purpose. See the Help & Reference page for methodology details and references.

Material Selection

Material

Proton Energy (MeV)

Valid range: 0.08 keV – 1000 MeV (material-dependent)

Result

NIEL at selected energy

MeV-cm²/g

Equivalent in keV-cm²/g

Damage energy cross section (MeV-mb)

Fluence Conversion

Material

Source Energy (MeV)

Source Fluence (p/cm²)

Target Energy (MeV)

Result

NIEL at source energy

MeV-cm²/g

NIEL at target energy

MeV-cm²/g

NIEL ratio (source/target)

Equivalent fluence at target energy

p/cm²

Φ_target = Φ_source × NIEL(E_source) / NIEL(E_target)

Displacement Damage Dose (DDD)

Material

Proton Energy (MeV)

Fluence (p/cm²)

Result

NIEL at energy

MeV-cm²/g

Displacement Damage Dose

MeV/g

DDD = Φ × NIEL(E)

1 MeV Neutron Equivalent Fluence

Material

Proton Energy (MeV)

Proton Fluence (p/cm²)

Reference: NIEL(1 MeV neutron, Si) = 1.95 × 10^-3 MeV-cm²/g
This is the standard 95 MeV-mb reference value (ASTM E722).

Result

NIEL at proton energy (in material)

MeV-cm²/g

Displacement Damage Dose

MeV/g

1 MeV Neutron Equivalent Fluence (Si reference)

n_eq/cm²

Hardness factor (NIEL_p / NIEL_{1MeV n,Si})

Φ_neq = Φ_p × NIEL_p(E) / NIEL_{1MeV n,Si}

NIEL vs Proton Energy (Log-Log)

Data from Jun et al., IEEE TNS 50(6), 2003. Log-log interpolation between data points.

NIEL Data Table (Jun et al., Table I)

All values in MeV-cm²/g. Silicon uses high-resolution dataset (36 points). Other materials from Table I of the paper.

Material: