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Cyclotron regulation in Michigan
Verified August 2026
One entry from the 51-jurisdiction survey, read against a small, fully enclosed, sub-MeV machine whose beam terminates inside its own vacuum chamber.
- Small machine vs. definition
- Ambiguous — Ambiguous — turns on agency reading
The definitional text could plausibly be read either way; the outcome turns on how the agency reads it.
- How Michigan defines “particle accelerator”
- Firm 1 MeV floor
- Governing citation
- Mich. Admin. Code R 333.5432 (firm “in excess of 1 MeV”)
- Register / license
- Registration
- Incidental-radiation exemption
- R 333.5033(1) — “for other purposes” lead-in
- Notes (as verified August 2026)
- The accelerator part carries a firm 1 MeV floor, so sub-MeV machines are cleanly outside it; the generic radiation-machine definition (R 333.5010(3)) still applies, with registration and the R 333.5033 exemption analysis.
What to do
Identify the state radiation-control program before the machine is first energized. Ask the program in writing how it classifies the machine before purchasing or building one, rather than relying on a private reading of the definition. Document the machine’s maximum energy and the fact that its beam is internal to the vacuum chamber — that record is what any classification, exemption argument, or registration review turns on.
This is information, not legal advice. Everything on this page was verified against primary sources (statutes, administrative codes, agency publications) as of August 2026. Regulatory text moves — several states recodified or rewrote their radiation rules in 2023–2026 alone — so anything consequential should be re-checked against the current text of the cited provision, and questions about a specific machine belong to the state radiation-control program or qualified counsel.
See the legal overview for the federal layer and how the incidental-radiation exemption is read, and the full 51-jurisdiction table and map for every other state.