Rare and toxic, protactinium is a fleeting bridge between thorium and uranium.

---

🔬 Elemental Profile

• Symbol: Pa
• Atomic Number: 91
• Isotopes: ²³¹Pa (32 ky).

---

🏭 Industries & Markets

• Research: nuclear fuel cycles.
• Geology: ocean circulation tracers.

Markets: tiny, research-only.

---

📡 Communications & Connectivity

• Geological comms: Pa isotopes trace Earth’s ocean currents.
• Human: “protos” (Greek: first) + “actinium.”

---

🔄 Circular Economy Role

• Only via nuclear reprocessing.

---

💹 Cost & Economic Levers

• Too rare for scale.

---

📊 Indices (Economos Metrics)

• CTS: extreme.
• HCI: 50 — research only.
• CCI: 40 — limited standards.
• CL: 0.8 — no industrial loops.

---

⚙️ Economos Grammar Examples

ALLOCATE Pa TO RESEARCH_REACTORS WITH SAFETY_FLAG;

---

🌍 Closing Note

Protactinium is the bridge — fleeting but connective in nuclear alchemy. In Economos, it signals transition.