(a) Transporting in Air Commerce.—Material that emits ionizing radiation spontaneously may be transported on a passenger-carrying aircraft in air commerce (as defined in section 40102(a) of this title) only if the material is intended for a use in, or incident to, research or medical diagnosis or treatment and does not present an unreasonable hazard to health and safety when being prepared for, and during, transportation.

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(b) Procedures.—The Secretary shall prescribe procedures for monitoring and enforcing regulations prescribed under this section.

(c) Nonapplication.—This section does not apply to material the Secretary decides does not pose a significant hazard to health or safety when transported because of its low order of radioactivity.