Bureau of Services for Blind Persons
Michigan Career & Technical Institute
Michigan High-Speed Internet Office
Michigan Rehabilitation Services
Workers' Disability Compensation Agency
Black Leadership Advisory Council
Michigan Community Service Commission
Executive Order 2020-107 established Michigan Workforce Development Board
MiSTEM convenes a statewide network of leaders in education, business and local communities to empower the next generation of innovators.
Unemployment Insurance Appeals Commission
formerly MI Compensation Appellate Commission
Search is currently unavailable. Please try again later.
The web Browser you are currently using is unsupported, and some features of this site may not work as intended. Please update to a modern browser such as Chrome, Firefox or Edge to experience all features Michigan.gov has to offer.
Most linear accelerator vaults are built with mazes at the vault entry to reduce the amount of shielding needed in the door to the vault. Some facilities prefer to use a mazeless entry which requires a very heavy door that is difficult or impossible to operate by hand. These doors use an electric motor to open and close the door with a battery backup system to power the door in case of power failure.
There is no rule in the Ionizing Radiation Rules that specifically addresses the use of a mazeless entry for radiation therapy linear accelerator vaults. However, Rule 315(5) states, "The enclosure shall be so constructed that individuals may at all times be able to escape from within." The question of "escapability" has been raised many times and has been defined by many different entities. The Radiation Safety Section's current position is that if the local building and fire inspectors consider a room escapable, then we will concur with their decision.
Updated: September 11, 2017