[Code of Federal Regulations] [Title 49, Volume 2] [Revised as of October 1, 2002] From the U.S. Government Printing Office via GPO Access [CITE: 49CFR173.442] [Page 622-623] TITLE 49--TRANSPORTATION CHAPTER I--RESEARCH AND SPECIAL PROGRAMS ADMINISTRATION, DEPARTMENT OF TRANSPORTATION PART 173--SHIPPERS--GENERAL REQUIREMENTS FOR SHIPMENTS AND PACKAGINGS--Table of Contents Subpart I--Class 7 (Radioactive) Materials Sec. 173.442 Thermal limitations. A package of Class 7 (radioactive) material must be designed, constructed, and loaded so that-- (a) The heat generated within the package by the radioactive contents will not, during conditions normally incident to transport, affect the integrity of the package; and (b) The temperature of the accessible external surfaces of the loaded package will not, assuming still air in the shade at an ambient temperature of 38 deg.C (100 deg.F), exceed either-- (1) 50 deg.C (122 deg.F) in other than an exclusive use shipment; or [[Page 623]] (2) 85 deg.C (185 deg.F) in an exclusive use shipment.