Vault Wall Composite
Layered Regolith/HDPE/BPE/Tungsten Vault Wall
The vault wall composite is a three-meter-thick layered barrier engineered to shield biological samples and safety-critical electronics within sub-surface lunar storage vaults. Lacking an atmosphere and magnetosphere to deflect space radiation, the installation counters intense particle cascades through sequential material zoning. An outer layer of compacted regolith attenuates primary galactic cosmic rays, high-density polyethylene moderates generated neutrons, borated polyethylene performs neutron capture, and an inner tungsten alloy layer absorbs secondary gamma emissions. Designed for passive operation over a 100-year lifetime, this sub-surface structural composite maintains internal radiation dose rates below 0.5 millisieverts per year.
Layered composite wall around the dedicated radiation vault (housing biological/genetic samples + safety-critical electronics) optimised for maximum dose reduction per kg.
Purpose
Layered composite wall around the dedicated radiation vault (housing biological/genetic samples + safety-critical electronics) optimised for maximum dose reduction per kg.
Context
Child of L2-RAD-VAULT within the Lunar Ark system
Principles
- ▸Layered design: outer regolith (GCR) → HDPE (neutron) → BPE (capture) → tungsten (gamma)
- ▸Total wall thickness 3+ m equivalent
- ▸Sub-surface siting adds natural shielding
- ▸Internal dose <0.5 mSv/yr (CT scan equivalent per year)
- ▸Periodic monitoring verifies
Typical implementations
- ▸NASA Lunar Lava Tube shielding studies
- ▸ESA Moon Village deep shielding concepts
- ▸Earth-based deep storage facilities (WIPP, Svalbard)
Lunar considerations
- ▸Maximum-effort shielding for most critical payload
- ▸Combination of natural (regolith) and engineered (HDPE/BPE/W) shielding
- ▸Long-mission verification via dosimetry
Specifications
Functional
| primary function | Layered composite wall around the dedicated radiation vault (housing biological/genetic samples + safety-critical electronics) optimised for maximum dose reduction per kg. |
| total wall thickness m | 3 |
| internal dose msv per yr target | 0.5 |
Physical
| mass kg | 50000 |
| materials | Compacted regolith, HDPE, B4C-HDPE, Tungsten alloy |
| vacuum compatibility | True |
Operational
| power consumption w | 0 |
| thermal range c | -40, 70 |
| lifetime years | 100 |
| mtbf hours | 1000000 |
Interfaces
Provides
- <0.5 mSv/yr inside vault
- Protected genetic sample storage
Requires
- Vault structural foundation
Cite this entry
Lunar Ark Codex. "Vault Wall Composite" (L3-RAD-VAULT-WALL). Retrieved 10 September 2026, from https://lunarark.com/entry/L3-RAD-VAULT-WALL
Licensed CC-BY-SA 4.0. You may reuse and adapt this entry with attribution, under the same licence.