Section DHS 157.81 - Shielding plan review(1) PLAN REVIEW AND APPROVAL. Prior to construction, the floor plans, shielding specifications and equipment arrangement of all new installations, or modifications of existing installations, utilizing ionizing radiation machines, including dental CT and dental cephalometric machines, shall be submitted to the department for review and approval. Note: Plans may be mailed to the department at: Department of Health Services, Radiation Protection Section, P.O. Box 2659, Madison WI 53701-2659 or package delivery to: Department of Health Services, Radiation Protection Section, Room 150, 1 West Wilson St, Madison WI 53702-0007.
(2) EXEMPTIONS. Dental intraoral and panoramic, mammography, and bone density devices are exempt from this section.(3) PLAN SUBMITTAL REQUIREMENTS.(a) A shielding plan for a facility with two or more x-ray rooms shall include a medical physicist or person approved by a medical physicist recommendation for shielding.(b) A shielding plan submitted for department review shall include all of the following: 1. The maximum rated technique factors of each machine.2. A scale drawing of the room in which a stationary radiation machine system is located with such drawing indicating the use of areas adjacent to the room and an estimation of the extent of occupancy by a person in such areas. In addition, the drawing shall include all of the following: a. The type and thickness of materials, or lead equivalency, of each protective barrier.b. The use and occupancy of the areas surrounding an x-ray room, including occupied areas above or below an x-ray room.c. The construction materials used for the floor and ceiling, if appropriate.(c) The operator booth described in the shielding plan shall be designed to meet all the following requirements: 1. The view area of the window shall be at least 0.09 m 2 (144 square inches).2. The window shall be placed so that the edge of the view window is at least 0.45 meters (18 inches) from the end of the barrier. The window shall be placed so that the patient may be observed at all times and each entrance to the room is observed from the operator position. Patient and entrance observation may be accomplished by the use of electronic devices or mirrors.3. The shielding value of the window shall be equal to the wall in which it is mounted.4. Booth walls shall be 2.1 meters (7 feet) in height and permanently attached to the floor or walls. The booth shall be at least 1.3 meters (4 feet) from the nearest vertical cassette holder or 0.3 meters (one foot) from the nearest corner of the examining table.5. When a door or moveable panel is used as an integral part of the booth structure, it shall have a permissive device that prevents an exposure when the door or panel is not closed.6. Verbal communication with the patient shall be possible at all times during the x-ray procedure.7. The x-ray exposure control shall be located within the shielded area and at least 1 meter (3.3 feet) from the open end of the protective barrier, excluding mammography units.(4) OPERATIONAL ANALYSIS. The department may require additional modifications to a shielding plan after initial approval of the plan if a subsequent analysis of operating conditions indicates the possibility of a person receiving a dose in excess of the limits prescribed in ss. DHS 157.22 (1) and (5) to (8) and 157.23 (1) and (2). An existing x-ray room constructed using 5 mSv (500 mrem) as the public exposure limit may continue to operate without modification until the x-ray equipment is replaced or the room is modified.Wis. Admin. Code Department of Health Services DHS 157.81
CR 01-108: cr. Register July 2002 No. 559, eff. 8-1-02; CR 06-021: am. (3) (a) Register October 2006 No. 610, eff. 11-1-06; CR 09-062: am. (1) and (2), cr. (3) (c) 7. Register April 2010 No. 652, eff. 5-1-10.Amended by, correction in (2) (a) 2., 3. made under s. 35.17, Stats., Register January 2018 No. 745, eff. 2/1/2018Amended by, CR 22-015: am. (4) Register June 2023 No. 810, eff. 7/1/2023