cosmic radiation Archives

The K150 Cyclotron at Texas A&M Photo credit: CERN

SpaceX plans to build a particle accelerator facility in Florida. The 230 MeV cyclotron will accelerate protons to near-light speed, which the company says will be used to bring radiation effects testing in-house across all of its vehicles and satellite platforms.

The facility was confirmed by Michael Nicolls, SpaceX’s Vice President of Starlink, who posted on X on February 5 that the company is “hiring elite engineers at our new 230 MeV cyclotron facility in Florida, where we are bringing single-event radiation testing in house to accelerate development across all SpaceX vehicles.”

A job posting from SpaceX on ZipRecruiter is looking for an Electronics Test Engineer, and provides additional details.

“As part of our continuous effort to vertically integrate and scale safe and rapid access to space as well as improve the baseline reliability of our multiple on-orbit mega-constellations, SpaceX has acquired a 230 MeV cyclotron to bring radiation single event effects testing in house,” the posting reads. “This proton particle accelerator will be used to screen and characterize electronics across all of our vehicles and platforms, unlocking unprecedented agility for chip and PCBA level performance characterization that will be critical as we build and scale our AI constellations and deep space exploration vehicles.“

The exact location of the facility within Florida has not been disclosed. The job posting mentions Winter Park, a town in the Orlando metroplex. SpaceX operates extensive facilities across the Space Coast, including launch sites at Kennedy Space Center’s Launch Complex 39A and Cape Canaveral Space Force Station’s Space Launch Complex 40 and the forthcoming SLC-37, along with the expanding Roberts Road complex where the company is constructing its Florida Gigabay manufacturing facility and Starfactory 2.0.

Radiation Dangers?

Ionizing radiation (gamma rays, X-Rays, etc.) is produced during cyclotron operation. There’s also the use of high voltages and strong magnetic fields, plus, in some cases, hazardous target gases or liquids. Facilities typically address these with thick concrete or earth shielding, restricted access zones, and rigorous safety protocols.

For the general public outside a properly shielded facility, the risk is essentially negligible. Radiation levels at the facility boundary are required to be well below regulatory limits. The fact is, the average Space Coast resident will receive a far higher annual radiation dose from Earth’s background radiation alone.

Space Coast Annual Background Radiation

Annual Background Radiation Dose — Florida’s Space Coast

Estimated dose for Brevard County residents (sea level, ~28.5°N latitude)

Radiation Source	Description	mSv/year
Cosmic Radiation	From deep space & solar particles Minimal at sea level; deflected by Earth’s magnetic field at low latitude	~0.26
Terrestrial Radiation	From soil, rock & sand Florida’s sandy coastal soils are among the lowest in the U.S.	~0.10–0.23
Radon & Thoron	Radioactive gas from ground decay Very low on the Space Coast — sandy soil, no basements, good ventilation	~0.50–1.00
Internal (Body)	Potassium-40, carbon-14 & other radionuclides Present in all humans regardless of location	~0.40
Food & Water	Trace radionuclides ingested daily Potassium in bananas, brazil nuts, seafood, etc.	~0.30
Estimated Space Coast Natural Background Total		~1.60–2.20

Sources: U.S. Nuclear Regulatory Commission (NRC), EPA Background Dose Calculator, NCRP Report 160, Florida Dept. of Health Bureau of Radiation Control. Radon estimate reflects typical Brevard County conditions; individual homes may vary.

Note: 1 mSv = 100 mrem. The U.S. national average from natural background sources is approximately 3.1 mSv/year (~6.2 mSv total when including medical exposure). The Space Coast’s estimated 1.6–2.2 mSv is well below the national average due to sea-level elevation and low-radioactivity sandy soils.

Talk of Titusville

Who Regulates A Cyclotron?

If a cyclotron were installed on Florida’s Space Coast, the primary regulatory authority would be the Florida Department of Health, Bureau of Radiation Control. Florida has been an “Agreement State” since 1964, when the Atomic Energy Commission (now the U.S. Nuclear Regulatory Commission) signed a formal agreement transferring authority over radioactive materials licensing and enforcement to the state.

Today the Bureau of Radiation Control licenses more than 1,800 users of radioactive materials across Florida, including hospitals, universities, and research institutions.

A cyclotron operator would need to obtain a specific radioactive materials license from this bureau before possessing or using any of the isotopes a cyclotron produces. The bureau also handles registration of the cyclotron itself as an ionizing radiation machine under Chapter 64E-5 of the Florida Administrative Code.

The NRC retains an oversight role, periodically auditing Florida’s program to ensure it meets federal safety standards, but the state bureau is the agency an operator would deal with directly for licensing, inspections, and enforcement.

Why Build This Now?

Until now, aerospace companies including SpaceX have relied on a small number of external facilities to perform this testing. The Texas A&M Cyclotron Institute’s Radiation Effects Facility and the 88-Inch Cyclotron at Lawrence Berkeley National Laboratory have been the primary U.S. facilities, serving clients including SpaceX, Blue Origin, Boeing, Lockheed Martin, and NASA — all competing for limited beam time.

Texas A&M’s facility tested nearly 100 electronic components for SpaceX’s Crew Dragon capsule during a three-year period leading up to the historic Demo-2 mission in May 2020, which launched astronauts Bob Behnken and Doug Hurley to the International Space Station from KSC’s Pad 39A.

By building its own cyclotron, SpaceX eliminates the bottleneck of competing for beam time at shared facilities and gains the ability to test on its own schedule — a significant advantage given the pace at which the company iterates on hardware. SpaceX is currently producing new generations of Starlink satellites at a rapid clip, developing Starshield military variants, building the Starship Human Landing System for NASA’s Artemis program, and continuing to fly Dragon crew and cargo missions.

The natural radiation environment of space necessitates radiation testing for verification and improvements of the company’s product lines and is consistent with SpaceX’s broader strategy of aggressive vertical integration: if you can do it faster and cheaper internally, build it yourself.

Maybe Elton John was right when he sang in his hit “Rocket Man” that “Mars ain’t the kind of place to raise your kid.” As humanity moves closer and closer to astronauts and colonists living off of the Earth, pregnancy and childbirth are inevitable. A new study looks at the subject and it raises some interesting risks as well as a call for more research.

Published February 3 in Reproductive BioMedicine Online, a new review, “Reproductive biomedicine in space: implications for gametogenesis, fertility and ethical considerations in the era of commercial spaceflight,” brings together nine international experts in reproductive health, aerospace medicine, and bioethics to consider the issue.

Their central finding is stark: despite more than 65 years of human spaceflight, remarkably little is known about how the space environment affects the reproductive systems of men and women during long-duration missions.

“More than 50 years ago, two scientific breakthroughs reshaped what was thought biologically and physically possible — the first Moon landing and the first proof of human fertilisation in vitro,” said lead author Giles Palmer, a clinical embryologist at the International IVF Initiative. “Now we argue that these once-separate revolutions are colliding in a practical and underexplored reality.”

Three Potential Threats

The review identifies a triad of hazards. Cosmic radiation is the most well-characterized: beyond Earth’s protective magnetosphere, astronauts are exposed to galactic cosmic rays and high-energy charged particles that current shielding cannot fully block.

Doses exceeding approximately 250 milliSieverts can disrupt sperm production, and chronic exposure may impair the hormonal signaling that governs testosterone and sperm quality. (The average dose on ISS is 13 to 27 millisieverts (mSv) per month.) For women, animal studies link radiation to menstrual disruption and elevated cancer risk, though reliable human data from long missions remains scarce.

Microgravity introduces a separate set of problems. Weightlessness removes a fundamental mechanical cue that influences hormonal regulation, gamete development, and early embryonic growth. Animal studies have shown decreased sperm motility, increased DNA fragmentation, and disrupted development under microgravity conditions. Notably, a complete mammalian reproductive cycle — from egg and sperm development through birth — has never been achieved in space.

Circadian disruption rounds out the triad. Astronauts on the ISS experience roughly 16 sunrises every 24 hours. On Earth, similar disruptions in shift workers are linked to menstrual irregularities, reduced fertility, and poor pregnancy outcomes. The molecular clock genes active in reproductive tissues are known to impair ovulation when thrown out of sync.

Data from the Space Shuttle era offers some reassurance: female astronauts’ subsequent pregnancy rates were comparable to age-matched women on Earth. But those missions were far shorter than what’s now planned for lunar and Mars exploration, and male reproductive outcomes in space remain poorly documented. Clearly, more study is needed.

Ethical Questions Remain

The review raises ethical questions that reach beyond medical risk. If a child were conceived and born under lunar or Martian gravity, their skeletal and muscular development would differ fundamentally from Earth-born humans. Such an individual might be physically unable to live under terrestrial gravity — a scenario the authors frame as one of the most profound considerations of the coming era.

“As human presence in space expands, reproductive health can no longer remain a policy blind spot,” said senior author Dr. Fathi Karouia, a research scientist at NASA. He called for international collaboration to close knowledge gaps before commercial and long-duration missions make these questions unavoidable.

Source

Palmer GA, Mathyk BA, Jones JA, et al. “Reproductive biomedicine in space: implications for gametogenesis, fertility and ethical considerations in the era of commercial spaceflight.” Reproductive BioMedicine Online, published online February 3, 2026.

DOI: 10.1016/j.rbmo.2025.105431