DHS 157.03(201)(201) “Low toxicity alpha emitters” means natural uranium, depleted uranium, natural thorium; uranium-235, uranium-238, thorium-232, thorium-228 or thorium-230 when contained in ores or physical or chemical concentrates or tailings; or alpha emitters with a half-life of less than 10 days. DHS 157.03(203)(203) “Mammography” means radiography of the breast, but does not include radiography of the breast performed during invasive interventions for localization or biopsy procedures. DHS 157.03(204)(204) “Management” means the chief executive officer or other individual having the authority to manage, direct or administer the licensee’s or registrant’s activities, or those persons’ delegate or delegates. DHS 157.03(205)(205) “Manual brachytherapy” means a type of brachytherapy in which the radioactive sources are manually inserted either into the body cavities that are in close proximity to a tumor or directly into the tumor volume. DHS 157.03 NoteNote: Examples of radioactive sources are seeds and ribbons.
DHS 157.03(207)(207) “Maximum line current” means the root-mean-square current in the supply line of an x-ray machine operating at its maximum rating. DHS 157.03(208)(208) “Medical event” means an administration of radiation or radioactive material to a patient or human research subject that requires reporting to the department. DHS 157.03(209)(209) “Medical institution” means an organization in which medical disciplines are practiced. DHS 157.03(210)(210) “Medical physicist” means an individual with any of the following qualifications: DHS 157.03(210)(a)(a) Certified by the American board of radiology or the American board of health physics in one or more of the following: DHS 157.03(210)(b)(b) Certified by the American board of medical physics in radiation oncology physics. DHS 157.03(211)(211) “Medical use” means the intentional internal or external administration of radioactive material or the radiation from radioactive material to patients or human research subjects under the supervision of an authorized user. DHS 157.03(212)(212) “Medium dose-rate remote afterloader” or “MDR” means a device that delivers a dose rate of greater than 2 gray (200 rads) but less than 12 gray (1200 rads) per hour at the point or surface where the dose is prescribed. DHS 157.03(213)(213) “Megavolt” or “MV” means the energy equal to that acquired by a particle with one electron charge in passing through a potential difference of one million volts in a vacuum. DHS 157.03 NoteNote: The current convention is to use MV to designate photons and MeV to designate electrons.
DHS 157.03(214)(214) “Member of the public” means an individual in a controlled or unrestricted area. However, an individual is not a member of the public during any period in which the individual receives an occupational dose. DHS 157.03(215)(215) “Minor” means an individual less than 18 years of age. DHS 157.03(215m)(215m) “Mobile device” means a piece of equipment containing licensed radioactive material that is either mounted on wheels or casters, or otherwise equipped for moving without a need for disassembly or dismounting; or designed to be hand carried. “Mobile device” does not include stationary equipment installed in a fixed location. DHS 157.03(216)(216) “Mobile medical service supplier” means a mobile service that carries or receives radioactive materials for medical use at a client’s address. DHS 157.03(217)(217) “Mobile x-ray equipment” means x-ray equipment mounted on a permanent base with wheels or casters for moving while completely assembled. DHS 157.03(218)(218) “Moderator” means a material that decreases the energy of neutrons.