Legend (columns):
- I (Industries) – where the element is used most
- M (Markets) – major economic levers/commodities
- C (Comms layer) – Fiber / RF / Sat(ellite) / Opt(ical) / Q(Quantum) / Human (policy, language, standards)
- S (Spectrum anchors) – Γ (representative gamma ROI if operational), Kα (XRF Kα₁; “soft/mid/high” = practical detectability)
- Cir (Circularity) – recycling, recovery, substitution vectors
Frequency note: exact γ/XRF values are included where they’re operational anchors; if not central, I indicate detectability class (soft/mid/high) to keep the ledger compact.
Z = 1 — Hydrogen (H)
- I: fuels (H₂), chemical processing, fusion R&D
- M: emerging H₂ hubs; electrolyzers; ammonia carriers
- C: RF (pipeline IoT), Opt (leak IR), Sat (asset tracking), Human (policy)
- S: Γ: — (tritium β-only) · Kα: n/a
- Cir: power-to-gas, LOHCs, green H₂ → e-fuels; embrittlement management
Z = 2 — Helium (He)
- I: cryogenics (MRI), leak testing, lasers
- M: constrained; ASU by-product; price spikes hit labs/med
- C: Fiber (MRI backhaul), Sat (supply telemetry), Human (allocation)
- S: Γ: — · Kα: n/a
- Cir: recovery/reliquefaction loops at hospitals/fabs
Z = 3 — Lithium (Li)
- I: batteries, fusion breeding, glass/ceramics
- M: cathode-grade hydroxide/carbonate; spot cycles ↔ EV ramp
- C: Fiber/RF (BMS telemetry), Sat (mine–port), Human (ESG contracts)
- S: Γ: — · Kα: soft (lab)
- Cir: Li-ion recycling; Na/Mg substitution R&D; brine DLE
Z = 4 — Beryllium (Be)
- I: aerospace optics, BeCu springs, neutron reflectors
- M: specialty alloy; health regs constrain supply
- C: RF (RF-EMI parts), Opt (mirror metrology), Human (safety)
- S: Γ: — · Kα: soft
- Cir: scrap capture; Be-free spring alloys
Z = 5 — Boron (B)
- I: BNCT therapy, control rods, borosilicate glass, doping
- M: boric acid, B₄C, dopant gases
- C: Fiber (hospital PACS), RF (reactor IoT), Human (licensing)
- S: Γ: 478 keV (¹⁰B(n,α)⁷Li*) · Kα: soft
- Cir: boron recovery from glass slag; Gd/Li absorbers as complements
Z = 6 — Carbon (C)
- I: electrodes, composites, graphene/diamond, DAC
- M: graphite anode, needle coke; ¹⁴C labs
- C: Fiber (data), Opt (LIDAR), Human (carbon markets)
- S: Γ: 511 keV (PET ¹¹C) · Kα: soft
- Cir: DAC → mineralization; graphite anode recycling
Z = 7 — Nitrogen (N)
- I: ammonia/fertilizers, nitrides (GaN/AlN), cryo
- M: NH₃ trade; green NH₃ pilots
- C: RF (plasma tools), Sat (fertilizer flows), Human (ag policy)
- S: Γ: 511 keV (¹³N PET) · Kα: soft
- Cir: nitrate/nitrite loop closure; NOx abatement
Z = 8 — Oxygen (O)
- I: medical O₂, LOX rockets, ozone water treatment
- M: tonnage O₂; ¹⁸O water for PET
- C: Fiber (hospital imaging), Sat (O₂ logistics), Human (health codes)
- S: Γ: 511 keV (¹⁵O PET) · Kα: soft
- Cir: onsite O₂ generation; ozone → O₂ catalysts
Z = 9 — Fluorine (F)
- I: UF₆ fuel cycle, etch gases (NF₃/CF₄), fluoropolymers, ¹⁸F PET
- M: HF chain; PFAS/GHG policy risk
- C: RF (fab sensors), Fiber (radiopharma), Human (emissions rules)
- S: Γ: 511 keV (¹⁸F) · Kα: soft
- Cir: PFC abatement; electrolyte/salt recovery
Z = 10 — Neon (Ne)
- I: lithography lasers, signs, cryo
- M: ASU cyclic supply; fab demand swings
- C: Sat (gas shipping), Fiber (fab telemetry), Human (allocation)
- S: Γ: — · Kα: soft
- Cir: high-purity Ne recycle in fabs
Z = 11 — Sodium (Na)
- I: glass/soda ash, Na-cooled reactors, ²²Na PET cal
- M: soda ash index; Na metal niche
- C: Fiber (reactor DAS), RF (pipeline safety), Human (licensing)
- S: Γ: 1274.5/511 keV (²²Na) · Kα: 1.041 keV
- Cir: Na-ion batteries; caustic recovery loops
Z = 12 — Magnesium (Mg)
- I: light alloys, refractories, agri, meds
- M: alloy premiums; EV lightweighting driver
- C: Fiber (plant MES), Human (standards)
- S: Γ: — · Kα: 1.253 keV
- Cir: casting scrap return; Mg-ion R&D
Z = 13 — Aluminum (Al)
- I: structures, conductors, foil, semicap parts
- M: energy-intensive; hydro-power arbitrage
- C: Fiber (plant SCADA), Sat (bauxite–alumina chain), Human (trade)
- S: Γ: 1808 keV (²⁶Al astro; niche) · Kα: 1.486 keV
- Cir: high-rate recycling (can-to-can), closed loops
Z = 14 — Silicon (Si)
- I: semiconductors, PV, glass, SiC
- M: wafer/fab capacity; CHIPS/IRA policy levers
- C: Fiber/Opt (Si photonics), RF (front-ends), Q (Si qubits), Human (IP)
- S: Γ: — · Kα: 1.740 keV
- Cir: wafer reclaim, PV recycling pipelines
Z = 15 — Phosphorus (P)
- I: fertilizers, flame retardants, InP/GaP, biochem
- M: phosphate rock; ag price transmission
- C: Sat (crop yields), Human (water rules)
- S: Γ: β-only (³²P/³³P) · Kα: 2.013 keV
- Cir: struvite recovery; P loop in wastewater
Z = 16 — Sulfur (S)
- I: H₂SO₄, rubber vulcanization, MoS₂/TMDs
- M: sulfur price ↔ refinery throughput
- C: RF (plant sensors), Human (SOx regs)
- S: Γ: — · Kα: 2.307 keV
- Cir: sulfur loops; MoS₂ reclaim from catalysts
Z = 17 — Chlorine (Cl)
- I: PVC, disinfectants, solvents, perovskites
- M: chlor-alkali economics; energy price sensitive
- C: Human (water codes), Fiber (plant DCS)
- S: Γ: — · Kα: 2.622 keV
- Cir: PVC recycling; EDC–VCM emissions control
Z = 18 — Argon (Ar)
- I: welding/plasma shields, KrF/ArF ecosystems
- M: ASU arbitrage with fab/steel cycles
- C: RF (plasma etch), Sat (supply), Human (curtail plans)
- S: Γ: 1293.6 keV (⁴¹Ar) · Kα: 2.957 keV
- Cir: noble gas recycle & purifier skids
Z = 19 — Potassium (K)
- I: fertilizers, glass, biochemistry, clocks
- M: potash markets; food price linkage
- C: Sat (fertilizer logistics), Human (export controls)
- S: Γ: 1460.8 keV (⁴⁰K) · Kα: 3.312 keV
- Cir: ash/fertilizer loops; isotope-lean K blends
Z = 20 — Calcium (Ca)
- I: cement, fluxes, nutrition, imaging tracers
- M: cement demand = proxy for infra cycles
- C: Sat (cement CO₂ MRV), Human (codes)
- S: Γ: — (⁴¹Ca β) · Kα: 3.691 keV
- Cir: low-carbon cements; kiln heat electrification