Bioprinted scaffolds embed living cells inside a crosslinked hydrogel lattice. Denser crosslinking shields cells from ionizing radiation and slows diffusion of damaging free radicals, but each printed cell still carries its own random radiosensitivity. Survival after a stress event follows the linear-quadratic dose-response model used in radiobiology, combined with a Gaussian penalty for thermal stress away from the 37 °C physiological optimum.
shield = crosslink% / 100 * 0.7
D_eff = D * (1 - shield) [Gy]
S_dose = exp(-(α·D_eff + β·D_eff²)) α=0.3 Gy⁻¹, β=0.03 Gy⁻²
S_therm = exp(-(T-37)² / (2·σ²)) σ=18 °C
S_total = S_dose · S_therm
per-cell: alive if rand() < S_total · (0.8..1.2 sensitivity noise)
- Crosslink Density — thickens the printed lattice fibers and raises the radiation shielding factor.
- Radiation Dose — the stress dose applied to the scaffold on the next test, before shielding.
- Ambient Temp — deviation from 37 °C compounds damage via the thermal survival term.
- Run Stress Test — applies the dose/temperature to every cell and animates the outcome.
- Reprint Scaffold — regenerates a fresh lattice with all cells alive.
Real bioprinted constructs for space, extreme-climate or disaster-relief medicine are engineered exactly this way: tuning polymer crosslink density trades mechanical stiffness for radioprotection and thermal buffering of the encapsulated cells.