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TM 55-315
CHAPTER 14
THE UNITED STATES POSTAL SERVICE MOVEMENT
Section I. GENERAL
14-1. Purpose and Scope
This chapter outlines specific regulatory and procedural requirements that apply to movement of radioactive materials by
the US Postal Service. Any package of radioactive materials that must be labeled Radioactive White-I, Radioactive
Yellow-II, or Radioactive Yellow-III or that contains quantities of radioactive material in excess of those authorized in
section II is non-mailable. (USPS Publication 6)
14-2. Organization and Use
Section II contains the authorized quantities of radioactive materials that may be shipped by USPS. Section III contains
user checklists referenced to the USPS movement regulatory and procedural requirements contained in this and other
chapters of this manual.
Section II. REGULATORY AND PROCEDURAL REQUIREMENTS
14-3. Mailable Radioactive Materials
Mailable radioactive materials include only those that are classified as limited quantities of radioactive materials;
excepted instruments, articles, and devices; or excepted articles containing natural uranium or thorium as prescribed in
49 CFR 173. 421, 174. 422, or 173. 424, provided the activity content of any package, instrument, or article does not
exceed the activity limits stated in table 4-7 (49 CFR 173.423). (USPS Publication 6)
a. Limited Quantities (49 CFR 173. 421). Radioactive materials whose activity per package does not exceed the
limits specified in table 4-7 are excepted from specification packaging, marking, and labeling requirements if:
(1) The materials are packaged in strong, tight packages that will not leak any of the radioactive materials during
normal postal handling.  Liquid radioactive materials must be packaged also within a leak-resistant and corrosion-
resistant secondary inner container, surrounded by enough suitably positioned absorbent material to absorb at least twice
the volume of the liquid contents in the event of leakage from the secondary inner container;
(2) The radiation level at any point on the external surface of the package does not exceed 0. 5 millirem per
hour;
(3) The nonfixed (removable) radioactive surface contamination on the external surface of the package does not
exceed the limits specified in 49 CFR 173.443(a);
(4) The outside of the inner packaging or, if no inner packaging, the outside of the packaging itself is marked
Radioactive;
NOTE
Do not confuse the radioactive marking on the packaging with the requirement of paragraph 14-8,
which states that no identification marks are authorized on the external addressed covering of the
package.
(5) Except as provided in 49 CFR 173. 424, the package does not contain more than 15 grams of uranium-235;
and
(6) No single dimension less than 2.5 centimeters (1 inch) and the length and girth no less than 30 centimeters
(12 inches).
b. Instruments and Articles (49 CFR 173. 422). Instruments and manufactured articles (including clocks, electronic
tubes, or apparatus), or similar devices having radioactive materials in gaseous or nondispersible solid form and a
component part, are excepted from specification packaging, marking, and labeling requirements if:
(1) The activity of the instrument or device does not exceed the relevant limits listed in table 4-7 (49 CFR
173.423);
14-1

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