CRSC · California Referenced Standards Code

Radiation shielding standards (Chapter 12‑31C)

Chapter 12‑31C sets the mandatory radiation‑shielding standards (NCRP Reports 35, 49, 51) that the California Building Code requires for rooms housing radiation equipment.

Last reviewed: July 6, 2026

Overview

Chapter 12‑31C of the California Referenced Standards Code (Standard 12‑31C‑1) contains the mandatory radiation‑shielding standards that apply to rooms and enclosures housing radiation machines; Sec. 12‑31C‑101 directs compliance with the National Council on Radiation Protection and Measurements (NCRP) reports used for dental, medical and accelerator shielding design.

These referenced shielding standards are incorporated into the California Building Code: Chapter 31C (Sections 3101C–3104C) sets scope and specific installation requirements for medical radiographic, fluorographic and therapeutic X‑ray areas and directs that all shielding barriers meet the standards in § 12‑31C‑101. The Department of Public Health is the agency authorized to grant variances to these standards.

Key technical guidance called out in § 12‑31C‑101 includes NCRP Report No. 35 (dental X‑ray protection), Report No. 49 (structural shielding design for X‑rays/gamma rays up to 10 MeV) and Report No. 51 (radiation protection design for 0.1–100 MeV particle accelerator facilities), which together establish the methodologies and attenuation criteria used in California designs.

In this section

Code references

Grounded in the retrieved California Referenced Standards Code — click a citation to read the verbatim passage:

  • CRSC § 1.11. High relevance — show source text

    The state agency does not adopt sections identified with the following symbol: The Office of the State Fire Marshal’s adoption of this chapter or individual sections is applicable to structures regulated by other state agencies pursuant to Section 1.11.

    2025 CALIFORNIA BUILDING CODE 31C-1

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    31C-2 2025 CALIFORNIA BUILDING CODE

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    31C [DPH] RADIATION

    SECTION 3101C—SCOPE

    For the purpose of this chapter, the following terms shall have the meaning indicated:

    PRIMARY PROTECTIVE BARRIER is a barrier to attenuate the useful beam.

    SECONDARY PROTECTIVE BARRIER is a barrier to attenuate stray radiation.

    STRAY RADIATION is radiation not serving any useful purpose, which includes leakage and scattered radiation.

    USEFUL BEAM is the radiation which passes through the window, aperture, cone or other collimating device of the tube housing.

    SECTION 3102C—RADIATION SHIELDING BARRIERS

    All radiation shielding barriers in rooms and enclosures housing machines shall meet the requirements of Section 12-31C-101, Chapter 12-31C, Part 12, California Referenced Standards Code. The Department of Health Services is the only agency that may grant a variance or exception to these standards.

    SECTION 3103C—MEDICAL RADIOGRAPHIC AND PHOTOFLUOROGRAPHIC INSTALLATIONS

    3103C.1 Operator station. The operator’s station at the control shall be behind a protective barrier either in a separate room, in a protected booth or behind a shield which will intercept the useful beam and any radiation which has been scattered only once.

    3103C.2 Patient observation and communication. Provision shall be made for the operator to observe and communicate with the patient without leaving the shielded position at the control panel. When an observation window is used, it must provide radiation atten- uation equal to that required in the surrounding barrier.

    SECTION 3104C—MEDICAL THERAPEUTIC X-RAY INSTALLATIONS

    3104C.1 General. All wall, floor and ceiling areas that can be struck by the useful beam, plus a border of 1 foot (305 mm), shall be provided with primary protective barriers.

    3104C.2 Equipment operating above 50 kVp. Equipment operating above 50 kVp shall conform with the following: 1. The control station shielding shall either be an integral part of the building or anchored to the building. 2. The control station shall be provided with a window having radiation attenuation equal to that required by the adjacent barrier, or a mirror system, or a closed-circuit television viewing screen. The patient area must be visible to the operator with- out having to leave the protected area during exposure.

  • CRSC § 12-16 High relevance — show source text

    CALIFORNIA STANDARD FOR RESIDENTIAL EXCESS FLOW ACTUATED AUTOMATIC GAS SHUTOFF VALVES (SEE CCR TITLE 24, PART 5, CHAPTER 12) STANDARD 12-16-2

    DIVISION OF THE STATE ARCHITECT

    Authority: Sections 19200–19204, Health and Safety Code. Reference: Sections 19201.5 and 19202, Health and Safety Code.

    DIVISION 1—CONSTRUCTION

    SCOPE

    Sec. 12-16-201. The American Society for Testing and Materials (ASTM) F2138-12(2017) Standard Specification for Excess Flow Valves for Natural Gas Service, and the American National Standards Institute (ANSI) Z21.93-2017/CSA 6.30-2017 Excess Flow Valves for Natural and LP Gas with Pressure up to 5 psig, shall be the applicable standards used by the Division of the State Architect for certification of these devices.

    Sec. 12-16-201.1. Each installation of a customer-owned device that satisfies this standard shall be in accordance with the California Plumbing Code (CCR Title 24, Part 5).

    2025 CALIFORNIA REFERENCED STANDARDS CODE 103

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    104 2025 CALIFORNIA REFERENCED STANDARDS CODE

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    12-31C RADIATION SHIELDING STANDARDS

    STANDARD 12-31C-1

    DEPARTMENT OF HEALTH SERVICES

    Authority: Sections 102, 208 and 25811.

    Reference: Sections 102, 208 and 436.5.

    ALL HEALING ARTS X-RAY INSTALLATIONS

    Sec. 12-31C-101. All radiation shielding barriers in rooms and enclosures housing radiation machines shall comply with the mandatory standards and appendices in Report No. 35, “Dental X-RAY Protection”; Report 49, “Structural Shielding Design and Evaluation for Medical use of X-rays and Gamma Rays of Energies up to 10 MeV”; and Report No. 51, “Radiation Protection Design Guidelines for 0.1-100 MeV Particle Accelerator Facilities.” Published by the National Council on Radiation Protection and Measurements, 7910 Woodmont Avenue, Bethesda, Maryland 20814.

    2025 CALIFORNIA REFERENCED STANDARDS CODE 105

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    106 2025 CALIFORNIA REFERENCED STANDARDS CODE

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    12-71 AIR FILTERS

    STANDARD 12-71-1

    STATE FIRE MARSHAL

    DESCRIPTION OF TEST APPARATUS, METHOD AND CLASSIFICATION REQUIREMENTS FOR AIR FILTERS

    Sec. 12-71-100.

    (a) Test apparatus.

    1. The test duct, made of M.S. gage galvanized sheet metal reinforced with angle irons, is 21 inches square (13 548 mm [2] ) and 13 [1] / 2 feet (4114 mm) long.
  • CRSC § 1224.34.3.2 High relevance — show source text

    but otherwise having the_ same functional characteristics as the above mega-voltage units and conforming to the requirements of Chap- ter 31C and the California Radiation Control Regulations, California Code of Regulations, Title 17, Division 1, Chapter 5, Subchapter 4. 5.3. Direct access to space provided for brachytherapy equipment which shall meet the requirements of Chapter 31C and the California Radiation Control Regulations, California Code of Regulations, Title 17, Division 1, Chap- ter 5, Subchapter 4. 5.4. Shielding of the rooms shall meet the requirements of Chapter 31C and the California Radiation Control Regula- tions. California Code of Regulations, Title 17, Division 1, Chapter 5, Subchapter 4.

    1224.34.3.2 Radiation protection. Cobalt, linear accelerators, hot lab and high dose rate brachytherapy rooms and simulation rooms require radiation protection. All rooms that provide radiation treatment shall be appropriately shielded. A certified physi- cist shall specify the type, location and amount of protection to be installed in accordance with final approved department layout and equipment selection. Radiation protection requirements shall be incorporated into the construction documents and comply with Chapter 31C and the requirements of California Radiation Control Regulations, California Code of Regulations, Title 17, Divi- sion 1, Chapter 5 and Subchapter 4.

    1224.34.3.3 Room sizes. Rooms shall be sized as follows:

    1. Cobalt rooms and linear accelerators shall be sized in accordance with equipment requirements and shall accommo- date a gurney for litter borne patients. Layouts shall provide for preventing the escape of radioactive particles. Openings into the room, including doors, ductwork, vents and electrical raceways and conduits, shall be baffled to prevent direct exposure to other areas of the facility. 2. Simulator, accelerator and cobalt rooms shall be sized to accommodate the equipment with patient access on a gurney, medical staff access to the equipment and patient, and service access. 3. Where a table is used, the room shall be sized to provide a minimum clearance of 4 feet (1218 mm) on three sides of the table to facilitate bed transfer and provide access to the patient. The door swing shall not encroach on the equipment space, patient circulation space or transfer space. 4. Minimum room size shall be 260 square feet (24.15 m [2] ) for the simulator room; 680 square feet (63.17 m [2] ), including the maze, for accelerator rooms; 200 square feet (18.58 m [2] ) for brachytherapy rooms; and 450 square feet (41.81 m [2] ) for cobalt rooms.

    1224.34.3.4 General support area. The following areas shall be provided: 1. A gurney hold area adjacent to the treatment rooms, screened for privacy and combined with a seating area for outpatients. 2. Exam or treatment room shall be provided with a minimum of 100 square feet (9.29 m [2] ) with a minimum dimension of 8 feet (2438 mm). Each exam room shall be equipped with a handwashing station.

  • CRSC § 12-16 High relevance — show source text

    CHAPTER 12-16-1 ENGINEERING REGULATIONS—QUALITY

    AND DESIGN OF THE MATERIALS OF

    CONSTRUCTION . . . . . . . . . . . . . . . . . . . 101

    CHAPTER 12-16-2 ENGINEERING REGULATIONS—QUALITY

    AND DESIGN OF THE MATERIALS OF

    CONSTRUCTION . . . . . . . . . . . . . . . . . . . 103

    CHAPTER 12-31C RADIATION SHIELDING STANDARDS . . 105

    CHAPTER 12-71 AIR FILTERS. . . . . . . . . . . . . . . . . . . . . . . 107

    CHAPTER 12-72-1 PROTECTIVE SIGNALING SYSTEMS . . . 109

    CHAPTER 12-72-2 PROTECTIVE SIGNALING SYSTEMS . . . 123

    CHAPTER 12-72-3 PROTECTIVE SIGNALING SYSTEMS . . . 133

    HISTORY NOTE APPENDIX . . . . . . . . . . . . . . . . . . . . . . . . . . . 157

    2025 CALIFORNIA REFERENCED STANDARDS CODE vii

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    viii 2025 CALIFORNIA REFERENCED STANDARDS CODE

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    PART 12 CROSS REFERENCE TABLE

    (Cross reference table is nonregulatory, intended only as an aid to the code user.)

    PART 12
    STANDARD
    SUBJECT ADOPTING
    AGENCY
    ASSOCIATED TITLE 24
    BUILDING STANDARD
    Chapter 12-3 Releasing systems for security bars in
    dwellings
    SFM Part 2, Sections 1031.2.1, 1031.6, 1032.7
    Part 2.5, Sections R319.1.1 and R319.4.4
    Part 9, Sections 1031.2.1, 1031.6, 1032.7
    Appendix 4 Section 452.1.5 and Title 19 provisions 4.1, 4.2, 4.3,
    4.4, 4.5, 4.6 reprinted in Part 9
    Part 10, Section 505.4
    Chapter 12-4A Laboratory animal quarters standards DPH Part 2, Section 1236
    Chapter 12-4-1 Stage and Platforms SFM Part 2, Sections 410.2.7, 410.2.7.1, 410.2.7.2
    Part 9, Sections 105.6.51, 4809
    Chapter 12-7-1 Fire-resistive standards.
  • CRSC § 436.5. High relevance — show source text

    DEPARTMENT OF HEALTH SERVICES

    Authority: Sections 102, 208 and 25811.

    Reference: Sections 102, 208 and 436.5.

    ALL HEALING ARTS X-RAY INSTALLATIONS

    Sec. 12-31C-101. All radiation shielding barriers in rooms and enclosures housing radiation machines shall comply with the mandatory standards and appendices in Report No. 35, “Dental X-RAY Protection”; Report 49, “Structural Shielding Design and Evaluation for Medical use of X-rays and Gamma Rays of Energies up to 10 MeV”; and Report No. 51, “Radiation Protection Design Guidelines for 0.1-100 MeV Particle Accelerator Facilities.” Published by the National Council on Radiation Protection and Measurements, 7910 Woodmont Avenue, Bethesda, Maryland 20814.

    2025 CALIFORNIA REFERENCED STANDARDS CODE 105

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    106 2025 CALIFORNIA REFERENCED STANDARDS CODE

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    12-71 AIR FILTERS

    STANDARD 12-71-1

    STATE FIRE MARSHAL

    DESCRIPTION OF TEST APPARATUS, METHOD AND CLASSIFICATION REQUIREMENTS FOR AIR FILTERS

    Sec. 12-71-100.

    (a) Test apparatus.

    1. The test duct, made of M.S. gage galvanized sheet metal reinforced with angle irons, is 21 inches square (13 548 mm [2] ) and 13 [1] / 2 feet (4114 mm) long.
    2. One end of the duct is tapered to the discharge of a variable-speed blower and the other end is open to discharge. A metal filter frame is provided near the middle of the length of the duct to receive one 20 by 20 inches (508 mm by 508 mm) (nominal) filter unit. Two tightfitting doors, located to permit access to the filter frame, are each provided with a mica window to permit observation of both faces of the filter and conditions in the duct downstream from the filter.
    3. Two 1-inch (25 mm) pipe elbows, about 18 inches (457 mm) from the base of the test filter, form gas burner outlets adjusted to provide yellow, wavering flames. The burners consume approximately 4 cubic feet (approximately 1,000 Btu/cubic feet) of gas per minute.
    4. With the filter in place the air velocity is adjusted to approximately 200 linear feet per minute as measured at the discharge end of the duct by an Alnor Velometer Anemometer.

    (b) Test method.

    1. Filters are tested clean, that is, unused. The flames are applied for 3 minutes during which time observations are made of both faces of the filter as to the downstream travel of flame or sparks and the density, duration and character of the products of combustion.
  • CRSC § 1224.34.2.14 High relevance — show source text

    1224.34.2.14 Hot lab for scintigraphy (gamma camera), PET and SPECT facilities. A securable area or room shall be provided in which radiopharmaceuticals can be safely stored and doses can be calculated and prepared. 1. A single hot lab shall be permitted to serve multiple scanners and nuclear medicine modalities. 2. The hot lab shall be shielded in compliance with Section 1224.34.1.1. 3. A source storage area, a dose area and a storage area for syringe shields shall be provided.

    1224.34.3 Radiotherapy service space.

    1224.34.3.1 Radiation therapy space. If radiation therapy is provided, the following shall be accommodated: 1. Patient reception and waiting areas. 2. Space for medical and physics staff functions. 3. Space for equipment and supplies. 4. Housekeeping room. 5. Direct access to space provided for radiation measurement and calibration equipment, including a calibration constancy instrument and access to a secondary standard dose meter.

    12-54 2025 CALIFORNIA BUILDING CODE

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    INTERIOR ENVIRONMENT

    5.1. A megavoltage treatment unit capable of delivering x-rays or gamma rays of effective energy 500 KeV or more and conforming to the requirements of Chapter 31C and the California Radiation Control Regulations, Califor- nia Code of Regulations, Title 17, Division 1, Chapter 5, Subchapter 4. 5.2. Access to a medium voltage or superficial treatment unit delivering 500 KeV or less, but otherwise having the same functional characteristics as the above mega-voltage units and conforming to the requirements of Chap- ter 31C and the California Radiation Control Regulations, California Code of Regulations, Title 17, Division 1, Chapter 5, Subchapter 4. 5.3. Direct access to space provided for brachytherapy equipment which shall meet the requirements of Chapter 31C and the California Radiation Control Regulations, California Code of Regulations, Title 17, Division 1, Chap- ter 5, Subchapter 4. 5.4. Shielding of the rooms shall meet the requirements of Chapter 31C and the California Radiation Control Regula- tions. California Code of Regulations, Title 17, Division 1, Chapter 5, Subchapter 4.

    1224.34.3.2 Radiation protection. Cobalt, linear accelerators, hot lab and high dose rate brachytherapy rooms and simulation rooms require radiation protection. All rooms that provide radiation treatment shall be appropriately shielded. A certified physi- cist shall specify the type, location and amount of protection to be installed in accordance with final approved department layout and equipment selection. Radiation protection requirements shall be incorporated into the construction documents and comply with Chapter 31C and the requirements of California Radiation Control Regulations, California Code of Regulations, Title 17, Divi- sion 1, Chapter 5 and Subchapter 4.

    1224.34.3.3 Room sizes. Rooms shall be sized as follows:

    1. Cobalt rooms and linear accelerators shall be sized in accordance with equipment requirements and shall accommo- _date a gurney for litter borne patients. Layouts shall provide for preventing the escape of radioactive particles.

  • CRSC § 12-10 High relevance — show source text

    CHAPTER 12-10-1 EXITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

    CHAPTER 12-10-2 EXITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

    CHAPTER 12-10-3 EXITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

    CHAPTERS 12-11A AND 12-11B

    BUILDING AND FACILITY ACCESS

    SPECIFICATIONS. . . . . . . . . . . . . . . . . . . . 85

    CHAPTER 12-12 RESERVED . . . . . . . . . . . . . . . . . . . . . . . . . 87

    CHAPTER 12-13 STANDARDS FOR INSULATING

    MATERIAL. . . . . . . . . . . . . . . . . . . . . . . . . . 89

    CHAPTER 12-16-1 ENGINEERING REGULATIONS—QUALITY

    AND DESIGN OF THE MATERIALS OF

    CONSTRUCTION . . . . . . . . . . . . . . . . . . . 101

    CHAPTER 12-16-2 ENGINEERING REGULATIONS—QUALITY

    AND DESIGN OF THE MATERIALS OF

    CONSTRUCTION . . . . . . . . . . . . . . . . . . . 103

    CHAPTER 12-31C RADIATION SHIELDING STANDARDS . . 105

    CHAPTER 12-71 AIR FILTERS. . . . . . . . . . . . . . . . . . . . . . . 107

    CHAPTER 12-72-1 PROTECTIVE SIGNALING SYSTEMS . . . 109

    CHAPTER 12-72-2 PROTECTIVE SIGNALING SYSTEMS . . . 123

    CHAPTER 12-72-3 PROTECTIVE SIGNALING SYSTEMS . . . 133

    HISTORY NOTE APPENDIX . . . . . . . . . . . . . . . . . . . . . . . . . . . 157

    2025 CALIFORNIA REFERENCED STANDARDS CODE vii

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    viii 2025 CALIFORNIA REFERENCED STANDARDS CODE

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    PART 12 CROSS REFERENCE TABLE

    (Cross reference table is nonregulatory, intended only as an aid to the code user.)

  • CRSC § 1.11. High relevance — show source text

    CALIFORNIA BUILDING CODE – MATRIX ADOPTION TABLE

    CHAPTER 31C – RADIATION

    (Matrix Adoption Tables are nonregulatory, intended only as an aid to the code user. See Chapter 1 for state agency authority and building applications.)

    Adopting agency BSC BSC-
    CG
    SFM HCD Col6 Col7 DSA Col9 Col10 OSHPD Col12 Col13 Col14 Col15 Col16 Col17 BSCC DPH AGR DWR CEC CA SL SLC
    Adopting agency BSC BSC-
    CG
    SFM 1 2 1/AC AC SS SS/CC 1 1R 2 3 4 5 6 6 6 6 6 6 6 6 6
    Adopt entire chapter X
    Adopt entire chapter as
    amended (amended
    sections listed below)
    Adopt only those sections
    that are listed below
    Chapter / Section

    The state agency does not adopt sections identified with the following symbol: The Office of the State Fire Marshal’s adoption of this chapter or individual sections is applicable to structures regulated by other state agencies pursuant to Section 1.11.

    2025 CALIFORNIA BUILDING CODE 31C-1

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    31C-2 2025 CALIFORNIA BUILDING CODE

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    31C [DPH] RADIATION

    SECTION 3101C—SCOPE

    For the purpose of this chapter, the following terms shall have the meaning indicated:

    PRIMARY PROTECTIVE BARRIER is a barrier to attenuate the useful beam.

    SECONDARY PROTECTIVE BARRIER is a barrier to attenuate stray radiation.

    STRAY RADIATION is radiation not serving any useful purpose, which includes leakage and scattered radiation.

    USEFUL BEAM is the radiation which passes through the window, aperture, cone or other collimating device of the tube housing.

    SECTION 3102C—RADIATION SHIELDING BARRIERS

    All radiation shielding barriers in rooms and enclosures housing machines shall meet the requirements of Section 12-31C-101, Chapter 12-31C, Part 12, California Referenced Standards Code. The Department of Health Services is the only agency that may grant a variance or exception to these standards.

    SECTION 3103C—MEDICAL RADIOGRAPHIC AND PHOTOFLUOROGRAPHIC INSTALLATIONS

  • CFC § 2702 High relevance — show source text

    Chapter 27 Electrical.

    Since electrical systems and components are an integral part of almost all structures, Chapter 27 references the California Electrical Code (CEC). In addition, Section 2702 addresses emergency and standby power requirements and references where they are required. Such systems must comply with the CFC and referenced standards.

    Chapter 28 Mechanical Systems.

    Nearly all buildings will include mechanical systems. Chapter 28 provides references to the CMC and other codes for the design and installation of mechanical systems. In addition, Chapter 21 of this code is referenced for masonry chimneys, fireplaces and barbecues.

    Chapter 29 Reserved .

    Chapter 30 Elevators and Conveying Systems.

    Chapter 30 provides standards for the installation of elevators into buildings, including requirements for elevator shafts and lobbies. Referenced standards provide the requirements for the elevator system and mechanisms. Special provisions are indicated for fire service access elevators and for the optional choice of occupant evacuation elevators in high rise buildings (see Section 403).

    Chapter 31 Special Construction.

    Chapter 31 contains a collection of regulations for a variety of unique structures and architectural features. Pedestrian walkways and tunnels connecting two buildings are addressed in Section 3104. Safeguards for swimming pool safety are addressed in Section 3109. Standards for temporary structures, including permit requirements, are provided in Section 3103. Structures as varied as awnings, marquees, signs, telecommunication and broadcast towers and automatic vehicular gates are also addressed (see Sections 3105

    xvi 2025 CALIFORNIA BUILDING CODE

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    through 3108 and 3110). Unique types of buildings, such as membrane structures, greenhouses, relocatable buildings and intermodal shipping containers (Sections 3102, 3112, 3113 and 3114) are also addressed in this chapter.

    Chapter 31A Systems for Window Cleaning or Exterior Building Maintenance.

    See Title 8, California Code of Regulations, Division 1, Chapter 4, Subchapter 7, General Industry Safety Orders, Group 1, Articles 5 and 6.

    Chapter 31B Public Pools.

    Chapter 31B is promulgated by the California Department of Public Health and provides the requirements for the construction, installa- tion, renovation, alteration, addition, relocation, replacement, or use of any public pool and to its ancillary facilities, mechanical equipment and related piping. Public pools include those located in or designated as the following: commercial building, hotel, motel, resort, recreational vehicle or mobile home park, campground, apartment house, condominium, townhouse, homeowner association, club, community building or area, public or private school, health club or establishment, water park, swim school, medical facility, bed and breakfast, licensed day-care facility, recreation and park district, and municipal pools.

    Chapter 31C Radiation.

    Chapter 31C is promulgated by the California Department of Public Health and focuses on radiation safety standards for buildings and equipment.

    Chapter 31D Food Establishments.

    Chapter 31D is promulgated by the California Department of Public Health. The provisions of this chapter apply to the construction of commissaries serving mobile food preparation units.

    Chapter 31E Reserved.

    Chapter 31F Marine Oil Terminals.

  • CRSC § 31B-22 High relevance — show source text

    3162B Anti-Entrapment Devices and Systems . . . . . . . . . . 31B-22

    CHAPTER 31C RADIATION . . . . . . . . . . . . . . . . . . . . . . . . . .31C-1

    3101C Scope. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31C-3

    3102C Radiation Shielding Barriers . . . . . . . . . . . . . . . . . . . . . 31C-3

    3103C Medical Radiographic and Photofluorographic Installations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31C-3

    3104C Medical Therapeutic X-Ray Installations. . . . . . . . . . 31C-3

    CHAPTER 31D FOOD ESTABLISHMENTS. . . . . . . . . . . . . . .31D-1

    3101D Scope. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31D-3

    3102D Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31D-3

    3103D Buildings and Structures. . . . . . . . . . . . . . . . . . . . . . . . . 31D-3

    CHAPTER 31E RESERVED. . . . . . . . . . . . . . . . . . . . . . . . . . .31E-1

    CHAPTER 31F MARINE OIL TERMINALS . . . . . . . . . . . . . . .31F-1

    3101F Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31F-3

    3102F Audit and Inspection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31F-6

    3103F Structural Loading Criteria . . . . . . . . . . . . . . . . . . . . . 31F-19

    3104F Seismic Analysis and Structural Performance. . . . 31F-34

    3105F Mooring and Berthing Analysis and Design . . . . . . 31F-48

    3106F Geotechnical Hazards and Foundations . . . . . . . . . 31F-55

  • CRSC § 12-7 High relevance — show source text

    Fire tests of building
    construction and materials.|SFM|Part 2, Section 703| |Chapter 12-7-2|Reserved||| |Chapter 12-7-3|Fire-resistive standards.
    Fire testing furnaces.|SFM|Part 9, Section 3001| |Chapter 12-7-4|Fire-resistive standards.
    Fire door assembly tests.|SFM|Part 2, Section 716| |Chapter 12-7-5|Fire-resistive standards. Interior
    finish of decorative material.|SFM|Part 2, Chapter 8
    Part 9, Chapter 8| |Chapter 12-7A|Materials and construction methods for
    exterior wildfire exposure|SFM|Part 7, Chapter 5| |Chapter 12-8-1|Fire-resistive standards for fire protection|SFM|Part 2, Sections 408.14 and 435.6.2| |Appendix 12-8-1A|Calculation of the total rate of heat and carbon
    monoxide or carbon dioxide production|SFM|| |Appendix 12-8-1B|Guide to mounting techniques for wall and
    ceiling interior finish material|SFM|| |Chapter 12-10-1|Exits. Power-operated exit doors.|SFM|Part 2, Sections 408.4.2, 1010.1.4.2, 1010.1.9.1| |Chapter 12-10-2|Exits. Single-point latching or locking devices.|SFM|Part 2, Section 1010.2.2
    Part 9, Section 1010.2.2| |Chapter 12-10-3|Exits. Emergency exit and panic hardware.
    |SFM|Part 9, Section 1009.12| |Chapter 12-11A,
    12-11B|Detectable warning products and directional
    surfaces|DSA|Part 2, Sections 1112A.9, 1116A.5, 11B-247,
    11B-406.5.12, 11B-705, 11B-810.5.2| |Chapter 12-12|Reserved||| |Chapter 12-13|Standards for insulating material|CA/SFM|Part 2.5, Section R302.10.1
    Part 6, Section 110.8
    Part 9, Section 720, Table 721.1(1)
    Part 11, Section A5.504.4.8| |Chapter 12-16-1|California standard for earthquake-actuated
    automatic gas shutoff systems|DSA|Part 2, Chapters 16 and 16A
    Part 5, Section 1211.8| |Chapter 12-16-2|California standard for residential excess flow
    actuated automatic gas shutoff valves|DSA|Part 5, Section 1209.1| |Chapter 12-31C|Radiation shielding|DPH|Part 2, Section 3102C| |Chapter 12-71|Air filters|SFM|Part 4, Sections 401.2, 509.2.3, 509.2.3.4
    Part 6, Section 120.1| |Chapter 12-72-1|Protective signaling systems.
    Standard test procedures.|SFM|| |Chapter 12-72-2|Protective signaling systems.

  • CRSC § 1009.12 Medium relevance — show source text

    Emergency exit and panic hardware.
    |SFM|Part 9, Section 1009.12| |Chapter 12-11A,
    12-11B|Detectable warning products and directional
    surfaces|DSA|Part 2, Sections 1112A.9, 1116A.5, 11B-247,
    11B-406.5.12, 11B-705, 11B-810.5.2| |Chapter 12-12|Reserved||| |Chapter 12-13|Standards for insulating material|CA/SFM|Part 2.5, Section R302.10.1
    Part 6, Section 110.8
    Part 9, Section 720, Table 721.1(1)
    Part 11, Section A5.504.4.8| |Chapter 12-16-1|California standard for earthquake-actuated
    automatic gas shutoff systems|DSA|Part 2, Chapters 16 and 16A
    Part 5, Section 1211.8| |Chapter 12-16-2|California standard for residential excess flow
    actuated automatic gas shutoff valves|DSA|Part 5, Section 1209.1| |Chapter 12-31C|Radiation shielding|DPH|Part 2, Section 3102C| |Chapter 12-71|Air filters|SFM|Part 4, Sections 401.2, 509.2.3, 509.2.3.4
    Part 6, Section 120.1| |Chapter 12-72-1|Protective signaling systems.
    Standard test procedures.|SFM|| |Chapter 12-72-2|Protective signaling systems. Single-and
    multiple-station fire alarm devices
    mechanically operated type.|SFM|| |Chapter 12-72-3|Protective signaling systems. Smoke detectors,
    combustion products type.|SFM||

    2025 CALIFORNIA REFERENCED STANDARDS CODE ix

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    x 2025 CALIFORNIA REFERENCED STANDARDS CODE

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    12-1 ADMINISTRATION

    RESERVED

    2025 CALIFORNIA REFERENCED STANDARDS CODE 1

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    2 2025 CALIFORNIA REFERENCED STANDARDS CODE

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    12-3 RELEASING SYSTEMS FOR SECURITY BARS IN DWELLINGS

    (This standard includes provisions of Underwriters Laboratories Subject 2326, Appendix B, dated December 17, 1999, reprinted with their permission.)

    INTRODUCTION

    SECTION 12-3-1—SCOPE

    12-3-1.1 These requirements cover releasing systems for bars, grilles, mesh, glazing or other items intended to provide security at doors and windows required for emergency escape from dwelling units. When actuated by the occupant, the system allows the obstructions over the door or window to be moved so occupants can escape in the event of an emergency.

Frequently asked questions

What specific standard section requires use of the NCRP reports?

Section 12‑31C‑101 of Standard 12‑31C‑1 requires that all radiation shielding barriers comply with the mandatory standards and appendices in NCRP Reports No. 35, 49 and 51.

Where in the Building Code must designers apply these shielding standards?

The California Building Code Chapter 31C (notably §§ 3101C–3104C and the radiation‑shielding barrier provisions) requires that shielding for radiographic, therapeutic and related rooms meet the standards in § 12‑31C‑101.

Who can grant an exception or variance to these standards?

The Department of Public Health (formerly Department of Health Services in the referenced standard) is the only agency authorized to grant variances or exceptions to the Chapter 12‑31C standards.

More in California Referenced Standards Code

Ask about the CRSC

Get cited, plain-English answers on the California Referenced Standards Code for your project — any code section, any scenario.

Start Free Trial

Related in the CRSC