SEE Cross-Section Fitting Tool

Weibull curve fitting, proton estimation, and rate prediction for Single Event Effects cross-section data

v1.0 · Apr 2026 Help & Reference
Disclaimer: This tool is provided for preliminary analysis and educational purposes only. Results have not been independently verified or validated for use in mission-critical decisions. 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, express or implied, regarding the accuracy, completeness, or fitness for any particular purpose of the results produced by this tool, and shall not be held liable for any damages arising from its use. See the Help & Reference page for methodology details and references.
Device Information
Cross-Section Data
# Effective LET (MeV-cm2/mg) Events Fluence (p/cm2) σ (cm2/dev) Lower 95% CI Upper 95% CI

Enter effective LET, events, and fluence. Cross-section and 95% Poisson confidence intervals are computed automatically.
Paste from Excel: Select a cell and paste (Ctrl+V) tab-delimited rows of [LET, Events, Fluence]. Multi-row paste supported.

Weibull Fit Controls

All data points weighted equally.

Slider: log10 scale. Text: enter value directly (e.g. 1.5e-5)

Weibull Parameters
Run auto-fit or adjust sliders to see parameters.
Goodness of Fit
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Single-Point Estimation (Ladbury Method)

When only a saturated cross-section is known, estimate a conservative LET threshold and bounding Weibull fit using the empirical LET0–σs correlation from Ladbury et al. (IEEE TNS, 2025).

Step function assumes W≈0 (maximum rate). Database-informed uses the empirical β-distribution of rate ratios from the CERN w–s database to produce a realistic but still conservative Weibull shape (Ladbury et al., IEEE TNS 2025).

Cross-Section vs LET
Edmonds Proton Upper Bound Estimation

Estimates proton/neutron cross-sections from heavy-ion Weibull parameters using the Edmonds Upper Bound model (Edmonds & Irom, IEEE TNS Vol. 55, No. 1, Feb 2008). σmodel(E) = (β(E)/a) × ∫ (1/L2) × σHI(L) dL, where β(E)/a coefficients are tabulated at 50, 100, and 200 MeV (protons) and 14 MeV (neutrons).

Heavy-Ion Weibull Parameters (from Tab 1)
No fit available. Run Weibull fit in Tab 1 first.
Estimated Proton Cross-Section (Edmonds UB)
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Proton Cross-Section at Standard Test Energies
Run estimation to see results.
Proton Susceptibility Assessment
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Heavy-Ion & Proton Cross-Sections
Environment Selection

Heavy-Ion Environments

Proton Environments

Proton Cross-Section Source

Rate Calculation Results
Heavy-Ion Rate
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Proton Rate
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Combined Rate (Best Estimate)
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Combined Rate (Worst Case)
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MTBE (Best Estimate)
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MTBE (Worst Case)
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Environment Spectrum
Mission Duration Analysis
Event Probability vs Time