Minn. R. agency 144, ch. 4731, STANDARDS FOR PROTECTION AGAINST RADIATION, pt. 4731.2320

Current through Register Vol. 49, No. 29, 2025

Part 4731.2320 - EXCEPTIONS TO POSTING REQUIREMENTS

Subpart 1.Short-term storage.

A licensee is not required to post a caution sign in areas or rooms containing radioactive materials for periods of less than eight hours, if:

A. the materials are constantly attended during these periods by an individual who takes the precautions necessary to prevent the exposure of individuals to radiation or radioactive materials in excess of the limits established in parts 4731.2000 to 4731.2950; and

B. the area or room is subject to the licensee's control.

Subp. 2.Hospital; patient room.

A room or other area in a hospital that is occupied by a patient is not required to be posted with a caution sign if the patient could be released from licensee control under part 4731.4427.

Subp. 3.Sealed sources.

A room or area is not required to be posted with a caution sign because of the presence of a sealed source if the radiation level at 30 centimeters from the surface of the source container or housing does not exceed 0.005 rem (0.05 mSv) per hour.

Subp. 4.Hospital; teletherapy, remote afterloader, or gamma stereotactic radiosurgery units.

A room in a hospital or clinic that is used for teletherapy, remote afterloader, or gamma stereotactic radiosurgery units is exempt from the requirement to post a caution sign if:

A. access to the room is controlled according to part 4731.4467; and

B. personnel in attendance take necessary precautions to prevent the inadvertent exposure of workers, other patients, and members of the public to radiation in excess of the limits established in parts 4731.2000 to 4731.2950.

Minn. R. agency 144, ch. 4731, STANDARDS FOR PROTECTION AGAINST RADIATION, pt. 4731.2320

29 SR 755; 36 SR 74

Statutory Authority: MS s 144.1202; 144.1203