Habitat Radiation Shield Designer

Mission Environment

Select location

Environment Data

Free-space source terms (pre-atmosphere)

Shielding Configuration

Layer stack — areal density drives attenuation

Dose-Equivalent Proxy

Annual exposure index (mSv-eq design proxy, solar minimum)

TOTAL ANNUAL PROXY DOSE

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mSv-eq / yr

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⚠ High-Z secondary penalty active: thick aluminum and/or lead is increasing GCR dose via spallation secondaries. Reduce high-Z layers or add hydrogen-rich material.

GCR component

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mSv-eq / yr

SPE chronic (avg/yr)

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mSv-eq / yr background

SPE acute (design storm)

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mSv-eq per single event

Trapped belt

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mSv-eq / yr

Shield areal mass

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kg / m²

Annual proxy vs. NASA career limit reference (1000 mSv-eq) —

0 50 ■ safe 200 ■ high 1000 mSv-eq

Design proxy — not a medical dose calculation. Reported unit is “mSv-eq” to distinguish from rigorously computed dose equivalent (Sv) or absorbed dose (Gy). Source terms calibrated to RAD/Curiosity Mars surface (~234 mSv/yr) and MSL/RAD cruise (~657 mSv/yr) measurements; LEO tuned to ISS operational ~150 mSv/yr at default hull thickness. Mars surface uses atmFactor 0.40 on free-space GCR of 580 to match RAD data; Titan surface uses atmFactor 0.04 (~1200 g/cm² column). Attenuation uses saturating exponentials per material; layers compound multiplicatively on remaining flux. Layer order is not modeled. Areal density (g/cm²) = thickness(cm) × density(g/cm³); mm sliders correctly convert to cm. Regolith modeled as non-hydrogen-rich bulk material (moderate GCR, strong SPE attenuation). High-Z secondary penalty (Al >30 mm, Pb >5 mm) is a heuristic multiplier, not a spallation transport calculation. Acute SPE metric is 10× the chronic SPE source through the same shielding — a design-case heuristic, not a specific historical event. Active magnetic shielding: no dose reduction modeled. Not a substitute for NASA OLTARIS / HZETRN.