Mississippi Administrative Code
Title 15 - Mississippi Department of Health
Part 21 - Division of Radiological Health
Subpart 78 - Radiological Health
Chapter 1 - REGULATIONS FOR CONTROL OF RADIATION IN MISSISSIPPI
Subchapter 9 - Radiation Safety Requirements for Particle Accelerators
Rule 15-21-78-1.9.12 - Ventilation Systems

1. Ventilation systems shall be provided to ensure that personnel entering any area where airborne radioactivity may be produced will not be exposed to airborne radioactive material in excess of those limits specified in Subchapter 4, Appendix B, Table I of these regulations.

2. A registrant, as required by 1.4.15 of these regulations, shall not vent, release, or otherwise discharge airborne radioactive material to an unrestricted area which exceeds the limits specified in Subchapter 4, Appendix B, Table I of these regulations, except as authorized pursuant to 1.4.15(3) of these regulations. For purposes of 1.9.12(2), concentrations may be averaged over a period not greater than one year. Every effort should be made to maintain releases of radioactive material to unrestricted areas as far below these limits as is reasonably achievable.