The Shroud of Turin: History's First Photograph? — A Proximity-Map Hypothesis for Image Formation

For over a century, the image on the Shroud of Turin has resisted scientific explanation. In 2011, researchers at ENEA showed that vacuum-ultraviolet (VUV) irradiation at 193 nm can reproduce key image characteristics on linen — but estimated that full-body scaling would require on the order of 3. 4 × 10¹3 W of peak power under bare-linen threshold assumptions, a figure that has made the result appear technologically prohibitive. This paper argues that a historically documented boundary condition has been under-modeled: the burial aromatics (myrrh and aloes) recorded in John 19: 39–40, acting as ultraviolet photosensitizers. A transparent three-factor estimate places the central threshold reduction at R ~ 10³ (defensible band 10²–10⁴, the upper end optimistic and action-spectrum-contingent), implying a body-scale peak-power requirement of order 10¹0–10¹1 W — still far below the bare-linen value, and shifting the mechanism from prohibitive toward experimentally testable. The central claim is the Proximity-Map framework: that the image on the Shroud is, in the most literal sense of the physics of image formation, a photograph — though not one made by any camera — and that the cloth itself is a primed, bilateral photochemical sensor, recording a distance-weighted, three-dimensional map of the body it was draped over. The model accounts for the Shroud's established macroscopic constraints — photographic negativity, extreme fiber-surface superficiality, 3D-correlated intensity, and the absence of image beneath bloodstains — and it is explicitly falsifiable: it stands or falls on a threshold and action-spectrum experiment on resin-treated linen (and, secondarily, molecular re-analysis of archived STURP tape-lift samples). The testable claim is independent of the Shroud's authenticity or date. What's new in v4 (a substantive revision, not cosmetic): the threshold-reduction factor R — asserted in earlier editions — is now derived transparently through an explicit three-factor model (Appendix A. 4), with its central estimate (~10³), defensible band (10²–10⁴), and underlying assumptions all stated openly. Language has also been tightened in places for precision. Dedicated to the memory of Barrie M. Schwortz (1946–2024), STURP Official Documenting Photographer. The Concept DOI 10. 5281/zenodo. 18327229 always resolves to the most recent version of this work.