The Warhead Dividend

The coldest object in most buildings that own one hangs from the ceiling like a chandelier: gold-plated discs stacked by diameter, coaxial lines falling between them like vines, and at the bottom, colder than interstellar space, a stage a few centimeters across where the qubits live. The working fluid of that last stage is helium-3. A large dilution refrigerator carries a charge of roughly forty liters of the gas. At standard conditions that is about five grams of matter, the mass of a sheet of paper, and at current purified prices it is a six-figure sum. The machine circulates the same charge, year after year, through a sealed loop of pumps, traps, and heat exchangers.

Every gram of it began life inside a nuclear weapon.

Modern warheads are boosted with tritium, and tritium decays with a half-life of 12.3 years, so the reservoirs come back on a schedule to be purged and refilled. The gas skimmed off during that maintenance, at the Savannah River Site, is decayed tritium: helium-3. It is the only domestic source the United States has ever had, auctioned in small lots through the federal isotope program. The deterrent pays out a dividend, a few thousand liters a year, and the strangest supply chain in cryogenics starts there.

A word on why this essay lives on this site. The vacuum hardware stays in the background this time, and I want to name that rather than smuggle it past you. But helium is my trade’s own gas: every weld I have ever qualified was sprayed with it, every leak I have ever found announced itself as mass 3 or 4 on a spectrum. The machines that drink this isotope are cryogenic ultrahigh-vacuum systems built by people I would recognize at a conference. And the story that follows is, from its first liter to its last, a story about closed systems. Those are the only stories I know how to read properly, so I am going to read this one.

the gas nobody makes

Nobody manufactures helium-3. It is harvested, and the harvest is small. On the supply side of the ledger there are exactly three working entries. The American one: warhead maintenance at Savannah River, federal draw now held under six thousand liters a year after the rationing reforms. The Canadian one: Ontario’s CANDU reactors produce tritium as a byproduct of heavy-water operation, and Darlington holds one of the largest civilian tritium inventories on Earth; Laurentis, an Ontario Power Generation subsidiary, extracts the helium-3 that accumulates in the storage containers, and Air Liquide distributes it. The Russian one: real, and since 2022 effectively closed to Western buyers.

Add it up and the world produces somewhere between twenty-two and forty thousand liters a year, depending on whose survey you trust, against demand estimates of forty to sixty thousand. The American stockpile sat near ninety thousand liters at last public count, roughly double its level at the bottom of the 2010 crisis. The supply curve is a radioactive decay law applied to a warhead inventory whose size is set by arms-control treaties. Disarmament is the upstream industry. Every liter in every fridge is the deterrent’s exhaust, metered by a half-life nobody can negotiate with.

the year the gas ran out

We have run this experiment before. After 2001, the United States decided to scan cargo at its borders for smuggled nuclear material, and the neutron detector of choice was a helium-3 proportional counter. The build-out consumed the gas at a rate that peaked near seventy-nine thousand liters in a single year, quietly emptied most of the strategic stockpile, and forced a secret interagency rationing scheme before Congress ever heard the isotope’s name. The GAO wrote the postmortem in 2011.

No new source appeared. The largest helium-3 consumer on Earth redesigned its detectors around boron-10 lined tubes and stopped needing the gas at all. Federal demand collapsed by an order of magnitude and the stockpile began, slowly, to refill.

So the recorded history of helium-3 has a shape, and it is worth stating as a law: demand has always yielded first. Supply has never once risen to meet it.

arithmetic at the bottom of the tank

The forecasts now circulating for the quantum era do not survive their own units, and the failure is instructive. Helium-3 quantities arrive in liters of gas, liters of liquid, grams, and kilograms, often in the same paragraph, and the conversions are brutal: one liter of gas at standard conditions weighs 0.13 grams, so a kilogram is about seven and a half thousand liters. The headline figures of three to four hundred kilograms of annual quantum demand convert to two or three million liters, which at roughly forty liters per large machine means tens of thousands of new dilution refrigerators built every single year. The market’s own per-machine gram counts put it near eighty thousand. The installed base, accumulated over two decades, is a few thousand; the largest manufacturer claims some eighteen hundred systems deployed, total.

The price record tells the same story in dollars. Federal auctions in the 2000s cleared at forty to eighty-five dollars a liter. The bulk market of the 2020s runs one thousand nine hundred to two thousand six hundred. Purified to dilution grade, above ten thousand, at times nearer twenty. Three decades of price climbed in twenty years. And here is my favorite line item: the lunar-mining pitch quotes helium-3 at twenty million dollars a kilogram. Divide by seven and a half thousand liters and the moon, priced honestly, lands at about two thousand seven hundred dollars a liter, squarely on the bulk market it claims to disrupt.

stock, not flow

There is a deeper error under the arithmetic, and it takes a practitioner to feel it in the hands. A dilution refrigerator does not consume helium-3. It seals it. The charge is an inventory, circulating in a closed gas-handling system where recovery is a religion and venting a six-figure accident. Losses exist, through permeation, through cold-trap maintenance, through the occasional human mistake, and they are small in a well-run circuit. Demand from quantum computing is therefore a stock: filled once per machine, topped up against losses, returned when the machine retires. The forecasts sell an annual flow. The machine fills a stock, once.

That distinction rewrites the market. Flow demand scales with computation performed; stock demand scales with machines built, and machines are built slowly. It also means the existing fleet is a reservoir: eighteen hundred fridges at up to forty liters apiece is on the order of seventy thousand liters already above ground, sealed, recoverable, and eventually resalable. Anyone who has chased leaks for a living reads the forecasts and sees the confusion at a glance, because our whole trade is the discipline of keeping a stock from becoming a flow.

three claimants to the first fresh liter

Which brings us to the frontier, because for the first time in the isotope’s history, three different industries claim they are about to make new helium-3 rather than harvest old bombs.

The loudest claimant is the Moon. Interlune, a Seattle company founded by lunar-industry veterans, has assembled about half a billion dollars in agreements, including a deal with the largest fridge maker for up to ten thousand liters a year across 2028 to 2037, and a camera riding to the lunar surface late this year to measure regolith concentrations, ahead of an excavation payload NASA has funded toward readiness in 2027. Interlune is no longer alone: in early August a second lunar company, Black Moon Energy, signed a prospective helium-3 supply agreement with the fusion firm TAE Technologies, a robotic survey mission promised within five years. I will offer a dated bet on all of it below. But the detail worth the entire press kit sits in their own disclosures: the first deliveries are set to come from terrestrial sources. Interlune’s Cold Capture program distills helium-3 out of ordinary Grade-A helium at liquefaction plants, hit ninety-nine percent purity this summer, and carries a defense contract to industrialize. The company sells the Moon and ships from a distillery, and the distillery is the better business. Prospectors have taken the hint: a Minnesota helium well spent the winter reporting the richest helium-3 concentration yet published for a terrestrial gas reservoir, about a dozen parts per billion, federally verified, and still, at heart, a feedstock for the same distillation.

The quietest claimant is fusion. Helion’s reactors are designed to burn deuterium and helium-3, a reaction whose products are all charged, which is what lets them pull electricity straight off the expanding plasma instead of boiling water. The fuel problem solves itself in the loop: the deuterium-deuterium side reactions breed helium-3, directly and through tritium that decays into more of it, and the company recovers and purifies the isotope in-house. Their founder has said they make it efficiently enough to consider selling the surplus. Their first commercial plant is under construction against a 2028 delivery contract. If the loop closes, fusion becomes a net source of helium-3 before it becomes a net source of electrons.

And the third claimant is absence. A Munich company sells millikelvin cooling with no helium-3 at all, adiabatic demagnetization instead of dilution, and openly doubts that an industry should be built on this gas. If quantum hardware ever standardizes around such platforms, the story ends the way 2010 ended: the detector redesigned, the gas unneeded. The law above says to take that possibility more seriously than any supply forecast.

the sting

One more thing happened while I was writing this. In March, strikes on Qatar’s Ras Laffan complex put roughly a third of the world’s helium supply under force majeure, with repairs measured in years; Russia, the swing producer, has its helium under export controls into late 2027; spot prices doubled. Ordinary helium-4, the abundant isotope, the gas we spray on welds without thinking, became the most contested molecule in the industrial gas trade. Now look one paragraph up: the most credible new source of helium-3 is a distillation column bolted to the world’s helium-4 liquefaction stream. The rare isotope has moored itself to the abundant one at the precise moment the abundant one stopped being abundant. Nothing in this supply chain stands on its own floor.

coda

The liter of gas in the chandelier has lived four lives, or will have soon. In 1965 it was tritium in a warhead reservoir, waiting for a war that never came. In 2010 its siblings were spent at the borders, sniffing cargo for the same plutonium the warheads carried. Today it circulates below ten millikelvin, sealed, hoarded, priced like treasure, holding a quantum processor below the temperature of deep space. And by the early 2030s, if one company in Everett is right, the machine that burns it will breed it, and the strangest supply chain in cryogenics will quietly close its own loop. Born of disarmament, spent on borders, hoarded for qubits, and finally home-made. It ships in a lecture bottle you could close one hand around: the charge of one fridge, the price of a house.

points of rendezvous

Dates this essay can be checked against:

• Late 2026. Interlune’s Crescent Moon camera flies on Astrobotic’s Griffin-1 lander.
• Fall 2027. The Prospect Moon excavation payload is due ready for lander integration.
• End 2027. Russia’s helium export controls expire, or are renewed.
• 2028. Helion’s Orion plant faces its Microsoft delivery deadline; first Interlune deliveries to Bluefors come due.
• 2029 to 2031. Ras Laffan’s helium capacity is due back, on the announced repair horizon.

four bets

Falsifiable, dated, and signed:

• B1. On January 1, 2030, more than ninety percent of commercially sold helium-3 will still trace to tritium decay, arsenals plus CANDU, and zero lunar liters will have been delivered to any customer.
• B2. The first new source to ship meaningful volume, say a thousand liters in a year, will be terrestrial distillation of the helium stream. The Moon will not be first, on any timeline I would sign.
• B3. If Orion runs on deuterium and helium-3 by its 2028 commitment, Helion will sell surplus helium-3 commercially before it has sold a full year of contracted electricity.
• B4. Real quantum-driven demand stays below ten thousand liters a year through 2030, an order of magnitude under the headline forecasts, because the machine fills a stock and the forecasts price a flow.

the six taps

tap	mechanism	status 2026	scale
Savannah River, US	warhead tritium decay	operating, sole US source	few kL/yr
Darlington, Canada	CANDU tritium stores, via Laurentis and Air Liquide	operating	few kL/yr
Russia	tritium decay, Rosatom	closed to Western buyers since 2022	opaque
Terrestrial distillation	He-3 skimmed from Grade-A helium (Interlune Cold Capture)	99 % purity shown, industrializing	claimed: could triple US supply
Lunar regolith	solar-wind He-3 mined from the Moon	camera flies late 2026	promised, 2028 onward
Fusion breeding	D-D side reactions in-loop (Helion)	Polaris operating, Orion building	surplus offered, unquantified